Module: ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaStatements

Included in:
ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
Defined in:
lib/active_record/connection_adapters/postgresql/schema_statements.rb

Instance Method Summary collapse

Instance Method Details

#add_column(table_name, column_name, type, **options) ⇒ Object

:nodoc:



480
481
482
483
484
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 480

def add_column(table_name, column_name, type, **options) # :nodoc:
  clear_cache!
  super
  change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment)
end

#add_exclusion_constraint(table_name, expression, **options) ⇒ Object

Adds a new exclusion constraint to the table. expression is a String representation of a list of exclusion elements and operators.

add_exclusion_constraint :products, "price WITH =, availability_range WITH &&", using: :gist, name: "price_check"

generates:

ALTER TABLE "products" ADD CONSTRAINT price_check EXCLUDE USING gist (price WITH =, availability_range WITH &&)

The options hash can include the following keys:

:name

The constraint name. Defaults to excl_rails_<identifier>.

:deferrable

Specify whether or not the exclusion constraint should be deferrable. Valid values are false or :immediate or :deferred to specify the default behavior. Defaults to false.

:using

Specify which index method to use when creating this exclusion constraint (e.g. :btree, :gist etc).

:where

Specify an exclusion constraint on a subset of the table (internally PostgreSQL creates a partial index for this).



782
783
784
785
786
787
788
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 782

def add_exclusion_constraint(table_name, expression, **options)
  options = exclusion_constraint_options(table_name, expression, options)
  at = create_alter_table(table_name)
  at.add_exclusion_constraint(expression, options)

  execute schema_creation.accept(at)
end

#add_foreign_key(from_table, to_table, **options) ⇒ Object 



598
599
600
601
602
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 598

def add_foreign_key(from_table, to_table, **options)
  assert_valid_deferrable(options[:deferrable])

  super
end

#add_index(table_name, column_name, **options) ⇒ Object

:nodoc:



549
550
551
552
553
554
555
556
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 549

def add_index(table_name, column_name, **options) # :nodoc:
  create_index = build_create_index_definition(table_name, column_name, **options)
  result = execute schema_creation.accept(create_index)

  index = create_index.index
  execute "COMMENT ON INDEX #{quote_column_name(index.name)} IS #{quote(index.comment)}" if index.comment
  result
end

#add_index_options(table_name, column_name, **options) ⇒ Object

:nodoc:



974
975
976
977
978
979
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 974

def add_index_options(table_name, column_name, **options) # :nodoc:
  if (where = options[:where]) && table_exists?(table_name) && column_exists?(table_name, where)
    options[:where] = quote_column_name(where)
  end
  super
end

#add_unique_constraint(table_name, column_name = nil, **options) ⇒ Object

Adds a new unique constraint to the table.

add_unique_constraint :sections, [:position], deferrable: :deferred, name: "unique_position", nulls_not_distinct: true

generates:

ALTER TABLE "sections" ADD CONSTRAINT unique_position UNIQUE (position) DEFERRABLE INITIALLY DEFERRED

If you want to change an existing unique index to deferrable, you can use :using_index to create deferrable unique constraints.

add_unique_constraint :sections, deferrable: :deferred, name: "unique_position", using_index: "index_sections_on_position"

The options hash can include the following keys:

:name

The constraint name. Defaults to uniq_rails_<identifier>.

:deferrable

Specify whether or not the unique constraint should be deferrable. Valid values are false or :immediate or :deferred to specify the default behavior. Defaults to false.

:using_index

To specify an existing unique index name. Defaults to nil.

:nulls_not_distinct

Create a unique constraint where NULLs are treated equally. Note: only supported by PostgreSQL version 15.0.0 and greater.



833
834
835
836
837
838
839
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 833

def add_unique_constraint(table_name, column_name = nil, **options)
  options = unique_constraint_options(table_name, column_name, options)
  at = create_alter_table(table_name)
  at.add_unique_constraint(column_name, options)

  execute schema_creation.accept(at)
end

#build_change_column_default_definition(table_name, column_name, default_or_changes) ⇒ Object

:nodoc:



509
510
511
512
513
514
515
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 509

def build_change_column_default_definition(table_name, column_name, default_or_changes) # :nodoc:
  column = column_for(table_name, column_name)
  return unless column

  default = extract_new_default_value(default_or_changes)
  ChangeColumnDefaultDefinition.new(column, default)
end

#build_change_column_definition(table_name, column_name, type, **options) ⇒ Object

Builds a ChangeColumnDefinition object.

This definition object contains information about the column change that would occur if the same arguments were passed to #change_column. See #change_column for information about passing a table_name, column_name, type and other options that can be passed.



498
499
500
501
502
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 498

def build_change_column_definition(table_name, column_name, type, **options) # :nodoc:
  td = create_table_definition(table_name)
  cd = td.new_column_definition(column_name, type, **options)
  ChangeColumnDefinition.new(cd, column_name)
end

#build_create_index_definition(table_name, column_name, **options) ⇒ Object

:nodoc:



558
559
560
561
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 558

def build_create_index_definition(table_name, column_name, **options) # :nodoc:
  index, algorithm, if_not_exists = add_index_options(table_name, column_name, **options)
  CreateIndexDefinition.new(index, algorithm, if_not_exists)
end

#change_column(table_name, column_name, type, **options) ⇒ Object

:nodoc:



486
487
488
489
490
491
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 486

def change_column(table_name, column_name, type, **options) # :nodoc:
  clear_cache!
  sqls, procs = Array(change_column_for_alter(table_name, column_name, type, **options)).partition { |v| v.is_a?(String) }
  execute "ALTER TABLE #{quote_table_name(table_name)} #{sqls.join(", ")}"
  procs.each(&:call)
end

#change_column_comment(table_name, column_name, comment_or_changes) ⇒ Object

Adds comment for given table column or drops it if comment is a nil



529
530
531
532
533
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 529

def change_column_comment(table_name, column_name, comment_or_changes) # :nodoc:
  clear_cache!
  comment = extract_new_comment_value(comment_or_changes)
  execute "COMMENT ON COLUMN #{quote_table_name(table_name)}.#{quote_column_name(column_name)} IS #{quote(comment)}"
end

#change_column_default(table_name, column_name, default_or_changes) ⇒ Object

Changes the default value of a table column.



505
506
507
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 505

def change_column_default(table_name, column_name, default_or_changes) # :nodoc:
  execute "ALTER TABLE #{quote_table_name(table_name)} #{change_column_default_for_alter(table_name, column_name, default_or_changes)}"
end

#change_column_null(table_name, column_name, null, default = nil) ⇒ Object

:nodoc:



517
518
519
520
521
522
523
524
525
526
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 517

def change_column_null(table_name, column_name, null, default = nil) # :nodoc:
  validate_change_column_null_argument!(null)

  clear_cache!
  unless null || default.nil?
    column = column_for(table_name, column_name)
    execute "UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote_default_expression(default, column)} WHERE #{quote_column_name(column_name)} IS NULL" if column
  end
  execute "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} #{null ? 'DROP' : 'SET'} NOT NULL"
end

#change_table_comment(table_name, comment_or_changes) ⇒ Object

Adds comment for given table or drops it if comment is a nil



536
537
538
539
540
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 536

def change_table_comment(table_name, comment_or_changes) # :nodoc:
  clear_cache!
  comment = extract_new_comment_value(comment_or_changes)
  execute "COMMENT ON TABLE #{quote_table_name(table_name)} IS #{quote(comment)}"
end

#check_constraints(table_name) ⇒ Object

:nodoc:



666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 666

def check_constraints(table_name) # :nodoc:
  scope = quoted_scope(table_name)

  check_info = internal_exec_query("    SELECT conname, pg_get_constraintdef(c.oid, true) AS constraintdef, c.convalidated AS valid\n    FROM pg_constraint c\n    JOIN pg_class t ON c.conrelid = t.oid\n    JOIN pg_namespace n ON n.oid = c.connamespace\n    WHERE c.contype = 'c'\n      AND t.relname = \#{scope[:name]}\n      AND n.nspname = \#{scope[:schema]}\n  SQL\n\n  check_info.map do |row|\n    options = {\n      name: row[\"conname\"],\n      validate: row[\"valid\"]\n    }\n    expression = row[\"constraintdef\"][/CHECK \\((.+)\\)/m, 1]\n\n    CheckConstraintDefinition.new(table_name, expression, options)\n  end\nend\n", "SCHEMA", allow_retry: true, materialize_transactions: false)

#client_min_messages ⇒ Object

Returns the current client message level.



314
315
316
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 314

def client_min_messages
  query_value("SHOW client_min_messages", "SCHEMA")
end

#client_min_messages=(level) ⇒ Object

Set the client message level.



319
320
321
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 319

def client_min_messages=(level)
  internal_execute("SET client_min_messages TO '#{level}'", "SCHEMA")
end

#collation ⇒ Object

Returns the current database collation.



252
253
254
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 252

def collation
  query_value("SELECT datcollate FROM pg_database WHERE datname = current_database()", "SCHEMA")
end

#columns_for_distinct(columns, orders) ⇒ Object

PostgreSQL requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.



905
906
907
908
909
910
911
912
913
914
915
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 905

def columns_for_distinct(columns, orders) # :nodoc:
  order_columns = orders.compact_blank.map { |s|
    # Convert Arel node to string
    s = visitor.compile(s) unless s.is_a?(String)
    # Remove any ASC/DESC modifiers
    s.gsub(/\s+(?:ASC|DESC)\b/i, "")
     .gsub(/\s+NULLS\s+(?:FIRST|LAST)\b/i, "")
  }.compact_blank.map.with_index { |column, i| "#{column} AS alias_#{i}" }

  (order_columns << super).join(", ")
end

#create_database(name, options = {}) ⇒ Object

Create a new PostgreSQL database. Options include :owner, :template, :encoding (defaults to utf8), :locale_provider, :locale, :collation, :ctype, :tablespace, and :connection_limit (note that MySQL uses :charset while PostgreSQL uses :encoding).

Example:

create_database config[:database], config
create_database 'foo_development', encoding: 'unicode'



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 23

def create_database(name, options = {})
  options = { encoding: "utf8" }.merge!(options.symbolize_keys)

  option_string = options.each_with_object(+"") do |(key, value), memo|
    memo << case key
            when :owner
              " OWNER = \"#{value}\""
            when :template
              " TEMPLATE = \"#{value}\""
            when :encoding
              " ENCODING = '#{value}'"
            when :locale_provider
              " LOCALE_PROVIDER = '#{value}'"
            when :locale
              " LOCALE = '#{value}'"
            when :collation
              " LC_COLLATE = '#{value}'"
            when :ctype
              " LC_CTYPE = '#{value}'"
            when :tablespace
              " TABLESPACE = \"#{value}\""
            when :connection_limit
              " CONNECTION LIMIT = #{value}"
            else
              ""
    end
  end

  execute "CREATE DATABASE #{quote_table_name(name)}#{option_string}"
end

#create_schema(schema_name, force: nil, if_not_exists: nil) ⇒ Object

Creates a schema for the given schema name.



273
274
275
276
277
278
279
280
281
282
283
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 273

def create_schema(schema_name, force: nil, if_not_exists: nil)
  if force && if_not_exists
    raise ArgumentError, "Options `:force` and `:if_not_exists` cannot be used simultaneously."
  end

  if force
    drop_schema(schema_name, if_exists: true)
  end

  execute("CREATE SCHEMA#{' IF NOT EXISTS' if if_not_exists} #{quote_schema_name(schema_name)}")
end

#create_schema_dumper(options) ⇒ Object

:nodoc:



921
922
923
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 921

def create_schema_dumper(options) # :nodoc:
  PostgreSQL::SchemaDumper.create(self, options)
end

#ctype ⇒ Object

Returns the current database ctype.



257
258
259
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 257

def ctype
  query_value("SELECT datctype FROM pg_database WHERE datname = current_database()", "SCHEMA")
end

#current_database ⇒ Object

Returns the current database name.



229
230
231
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 229

def current_database
  query_value("SELECT current_database()", "SCHEMA")
end

#current_schema ⇒ Object

Returns the current schema name.



234
235
236
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 234

def current_schema
  query_value("SELECT current_schema", "SCHEMA")
end

#current_schemas ⇒ Object

Returns an array of the names of all schemas presently in the effective search path, in their priority order.



240
241
242
243
244
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 240

def current_schemas # :nodoc:
  schemas = query_value("SELECT current_schemas(false)", "SCHEMA")
  decoder = PG::TextDecoder::Array.new
  decoder.decode(schemas)
end

#default_sequence_name(table_name, pk = "id") ⇒ Object

Returns the sequence name for a table’s primary key or some other specified key.



324
325
326
327
328
329
330
331
332
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 324

def default_sequence_name(table_name, pk = "id") # :nodoc:
  return nil if pk.is_a?(Array)

  result = serial_sequence(table_name, pk)
  return nil unless result
  Utils.extract_schema_qualified_name(result).to_s
rescue ActiveRecord::StatementInvalid
  PostgreSQL::Name.new(nil, "#{table_name}_#{pk}_seq").to_s
end

#drop_database(name) ⇒ Object

Drops a PostgreSQL database.

Example:

drop_database 'matt_development'



58
59
60
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 58

def drop_database(name) # :nodoc:
  execute "DROP DATABASE IF EXISTS #{quote_table_name(name)}"
end

#drop_schema(schema_name, **options) ⇒ Object

Drops the schema for the given schema name.



286
287
288
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 286

def drop_schema(schema_name, **options)
  execute "DROP SCHEMA#{' IF EXISTS' if options[:if_exists]} #{quote_schema_name(schema_name)} CASCADE"
end

#drop_table(*table_names, **options) ⇒ Object

:nodoc:



62
63
64
65
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 62

def drop_table(*table_names, **options) # :nodoc:
  table_names.each { |table_name| schema_cache.clear_data_source_cache!(table_name.to_s) }
  execute "DROP TABLE#{' IF EXISTS' if options[:if_exists]} #{table_names.map { |table_name| quote_table_name(table_name) }.join(', ')}#{' CASCADE' if options[:force] == :cascade}"
end

#encoding ⇒ Object

Returns the current database encoding format.



247
248
249
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 247

def encoding
  query_value("SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname = current_database()", "SCHEMA")
end

#exclusion_constraint_options(table_name, expression, options) ⇒ Object

:nodoc:



790
791
792
793
794
795
796
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 790

def exclusion_constraint_options(table_name, expression, options) # :nodoc:
  assert_valid_deferrable(options[:deferrable])

  options = options.dup
  options[:name] ||= exclusion_constraint_name(table_name, expression: expression, **options)
  options
end

#exclusion_constraints(table_name) ⇒ Object

Returns an array of exclusion constraints for the given table. The exclusion constraints are represented as ExclusionConstraintDefinition objects.



692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 692

def exclusion_constraints(table_name)
  scope = quoted_scope(table_name)

  exclusion_info = internal_exec_query("    SELECT conname, pg_get_constraintdef(c.oid) AS constraintdef, c.condeferrable, c.condeferred\n    FROM pg_constraint c\n    JOIN pg_class t ON c.conrelid = t.oid\n    JOIN pg_namespace n ON n.oid = c.connamespace\n    WHERE c.contype = 'x'\n      AND t.relname = \#{scope[:name]}\n      AND n.nspname = \#{scope[:schema]}\n  SQL\n\n  exclusion_info.map do |row|\n    method_and_elements, predicate = row[\"constraintdef\"].split(\" WHERE \")\n    method_and_elements_parts = method_and_elements.match(/EXCLUDE(?: USING (?<using>\\S+))? \\((?<expression>.+)\\)/)\n    predicate.remove!(/ DEFERRABLE(?: INITIALLY (?:IMMEDIATE|DEFERRED))?/) if predicate\n    predicate = predicate.from(2).to(-3) if predicate # strip 2 opening and closing parentheses\n\n    deferrable = extract_constraint_deferrable(row[\"condeferrable\"], row[\"condeferred\"])\n\n    options = {\n      name: row[\"conname\"],\n      using: method_and_elements_parts[\"using\"].to_sym,\n      where: predicate,\n      deferrable: deferrable\n    }\n\n    ExclusionConstraintDefinition.new(table_name, method_and_elements_parts[\"expression\"], options)\n  end\nend\n", "SCHEMA")

#foreign_key_column_for(table_name, column_name) ⇒ Object

:nodoc:



969
970
971
972
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 969

def foreign_key_column_for(table_name, column_name) # :nodoc:
  _schema, table_name = extract_schema_qualified_name(table_name)
  super
end

#foreign_keys(table_name) ⇒ Object 



604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 604

def foreign_keys(table_name)
  scope = quoted_scope(table_name)
  fk_info = internal_exec_query("    SELECT t2.oid::regclass::text AS to_table, c.conname AS name, c.confupdtype AS on_update, c.confdeltype AS on_delete, c.convalidated AS valid, c.condeferrable AS deferrable, c.condeferred AS deferred, c.conrelid, c.confrelid,\n      (\n        SELECT array_agg(a.attname ORDER BY idx)\n        FROM (\n          SELECT idx, c.conkey[idx] AS conkey_elem\n          FROM generate_subscripts(c.conkey, 1) AS idx\n        ) indexed_conkeys\n        JOIN pg_attribute a ON a.attrelid = t1.oid\n        AND a.attnum = indexed_conkeys.conkey_elem\n      ) AS conkey_names,\n      (\n        SELECT array_agg(a.attname ORDER BY idx)\n        FROM (\n          SELECT idx, c.confkey[idx] AS confkey_elem\n          FROM generate_subscripts(c.confkey, 1) AS idx\n        ) indexed_confkeys\n        JOIN pg_attribute a ON a.attrelid = t2.oid\n        AND a.attnum = indexed_confkeys.confkey_elem\n      ) AS confkey_names\n    FROM pg_constraint c\n    JOIN pg_class t1 ON c.conrelid = t1.oid\n    JOIN pg_class t2 ON c.confrelid = t2.oid\n    JOIN pg_namespace n ON c.connamespace = n.oid\n    WHERE c.contype = 'f'\n      AND t1.relname = \#{scope[:name]}\n      AND n.nspname = \#{scope[:schema]}\n    ORDER BY c.conname\n  SQL\n\n  fk_info.map do |row|\n    to_table = Utils.unquote_identifier(row[\"to_table\"])\n\n    column = decode_string_array(row[\"conkey_names\"])\n    primary_key = decode_string_array(row[\"confkey_names\"])\n\n    options = {\n      column: column.size == 1 ? column.first : column,\n      name: row[\"name\"],\n      primary_key: primary_key.size == 1 ? primary_key.first : primary_key\n    }\n\n    options[:on_delete] = extract_foreign_key_action(row[\"on_delete\"])\n    options[:on_update] = extract_foreign_key_action(row[\"on_update\"])\n    options[:deferrable] = extract_constraint_deferrable(row[\"deferrable\"], row[\"deferred\"])\n\n    options[:validate] = row[\"valid\"]\n\n    ForeignKeyDefinition.new(table_name, to_table, options)\n  end\nend\n", "SCHEMA", allow_retry: true, materialize_transactions: false)

#foreign_table_exists?(table_name) ⇒ Boolean

Returns:

  • (Boolean) 


662
663
664
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 662

def foreign_table_exists?(table_name)
  query_values(data_source_sql(table_name, type: "FOREIGN TABLE"), "SCHEMA").any? if table_name.present?
end

#foreign_tables ⇒ Object 



658
659
660
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 658

def foreign_tables
  query_values(data_source_sql(type: "FOREIGN TABLE"), "SCHEMA")
end

#index_name(table_name, options) ⇒ Object

:nodoc:



593
594
595
596
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 593

def index_name(table_name, options) # :nodoc:
  _schema, table_name = extract_schema_qualified_name(table_name.to_s)
  super
end

#index_name_exists?(table_name, index_name) ⇒ Boolean

Verifies existence of an index with a given name.

Returns:

  • (Boolean) 


73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 73

def index_name_exists?(table_name, index_name)
  table = quoted_scope(table_name)
  index = quoted_scope(index_name)

  query_value("    SELECT COUNT(*)\n    FROM pg_class t\n    INNER JOIN pg_index d ON t.oid = d.indrelid\n    INNER JOIN pg_class i ON d.indexrelid = i.oid\n    LEFT JOIN pg_namespace n ON n.oid = t.relnamespace\n    WHERE i.relkind IN ('i', 'I')\n      AND i.relname = \#{index[:name]}\n      AND t.relname = \#{table[:name]}\n      AND n.nspname = \#{table[:schema]}\n  SQL\nend\n", "SCHEMA").to_i > 0

#indexes(table_name) ⇒ Object

Returns an array of indexes for the given table.



91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 91

def indexes(table_name) # :nodoc:
  scope = quoted_scope(table_name)

  result = query("    SELECT distinct i.relname, d.indisunique, d.indkey, pg_get_indexdef(d.indexrelid),\n                    pg_catalog.obj_description(i.oid, 'pg_class') AS comment, d.indisvalid,\n                    ARRAY(\n                      SELECT pg_get_indexdef(d.indexrelid, k + 1, true)\n                      FROM generate_subscripts(d.indkey, 1) AS k\n                      ORDER BY k\n                    ) AS columns\n    FROM pg_class t\n    INNER JOIN pg_index d ON t.oid = d.indrelid\n    INNER JOIN pg_class i ON d.indexrelid = i.oid\n    LEFT JOIN pg_namespace n ON n.oid = t.relnamespace\n    WHERE i.relkind IN ('i', 'I')\n      AND d.indisprimary = 'f'\n      AND t.relname = \#{scope[:name]}\n      AND n.nspname = \#{scope[:schema]}\n    ORDER BY i.relname\n  SQL\n\n  result.map do |row|\n    index_name = row[0]\n    unique = row[1]\n    indkey = row[2].split(\" \").map(&:to_i)\n    inddef = row[3]\n    comment = row[4]\n    valid = row[5]\n    columns = decode_string_array(row[6]).map { |c| Utils.unquote_identifier(c.strip.gsub('\"\"', '\"')) }\n\n    using, expressions, include, nulls_not_distinct, where = inddef.scan(/ USING (\\w+?) \\((.+?)\\)(?: INCLUDE \\((.+?)\\))?( NULLS NOT DISTINCT)?(?: WHERE (.+))?\\z/m).flatten\n\n    orders = {}\n    opclasses = {}\n    include_columns = include ? include.split(\",\").map { |c| Utils.unquote_identifier(c.strip.gsub('\"\"', '\"')) } : []\n\n    if indkey.include?(0)\n      columns = expressions\n    else\n      # prevent INCLUDE columns from being matched\n      columns.reject! { |c| include_columns.include?(c) }\n\n      # add info on sort order (only desc order is explicitly specified, asc is the default)\n      # and non-default opclasses\n      expressions.scan(/(?<column>\\w+)\"?\\s?(?<opclass>\\w+_ops(_\\w+)?)?\\s?(?<desc>DESC)?\\s?(?<nulls>NULLS (?:FIRST|LAST))?/).each do |column, opclass, desc, nulls|\n        opclasses[column] = opclass.to_sym if opclass\n        if nulls\n          orders[column] = [desc, nulls].compact.join(\" \")\n        else\n          orders[column] = :desc if desc\n        end\n      end\n    end\n\n    IndexDefinition.new(\n      table_name,\n      index_name,\n      unique,\n      columns,\n      orders: orders,\n      opclasses: opclasses,\n      where: where,\n      using: using.to_sym,\n      include: include_columns.presence,\n      nulls_not_distinct: nulls_not_distinct.present?,\n      comment: comment.presence,\n      valid: valid\n    )\n  end\nend\n", "SCHEMA")

#inherited_table_names(table_name) ⇒ Object

Returns the inherited table name of a given table



213
214
215
216
217
218
219
220
221
222
223
224
225
226
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 213

def inherited_table_names(table_name) # :nodoc:
  scope = quoted_scope(table_name, type: "BASE TABLE")

  query_values("    SELECT parent.relname\n    FROM pg_catalog.pg_inherits i\n      JOIN pg_catalog.pg_class child ON i.inhrelid = child.oid\n      JOIN pg_catalog.pg_class parent ON i.inhparent = parent.oid\n      LEFT JOIN pg_namespace n ON n.oid = child.relnamespace\n    WHERE child.relname = \#{scope[:name]}\n      AND child.relkind IN (\#{scope[:type]})\n      AND n.nspname = \#{scope[:schema]}\n  SQL\nend\n", "SCHEMA")

#pk_and_sequence_for(table) ⇒ Object

Returns a table’s primary key and belonging sequence.



382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 382

def pk_and_sequence_for(table) # :nodoc:
  # First try looking for a sequence with a dependency on the
  # given table's primary key.
  result = query("    SELECT attr.attname, nsp.nspname, seq.relname\n    FROM pg_class      seq,\n         pg_attribute  attr,\n         pg_depend     dep,\n         pg_constraint cons,\n         pg_namespace  nsp\n    WHERE seq.oid           = dep.objid\n      AND seq.relkind       = 'S'\n      AND attr.attrelid     = dep.refobjid\n      AND attr.attnum       = dep.refobjsubid\n      AND attr.attrelid     = cons.conrelid\n      AND attr.attnum       = cons.conkey[1]\n      AND seq.relnamespace  = nsp.oid\n      AND cons.contype      = 'p'\n      AND dep.classid       = 'pg_class'::regclass\n      AND dep.refobjid      = \#{quote(quote_table_name(table))}::regclass\n  SQL\n\n  if result.nil? || result.empty?\n    result = query(<<~SQL, \"SCHEMA\")[0]\n      SELECT attr.attname, nsp.nspname,\n        CASE\n          WHEN pg_get_expr(def.adbin, def.adrelid) !~* 'nextval' THEN NULL\n          WHEN split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2) ~ '.' THEN\n            substr(split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2),\n                   strpos(split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2), '.')+1)\n          ELSE split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2)\n        END\n      FROM pg_class       t\n      JOIN pg_attribute   attr ON (t.oid = attrelid)\n      JOIN pg_attrdef     def  ON (adrelid = attrelid AND adnum = attnum)\n      JOIN pg_constraint  cons ON (conrelid = adrelid AND adnum = conkey[1])\n      JOIN pg_namespace   nsp  ON (t.relnamespace = nsp.oid)\n      WHERE t.oid = \#{quote(quote_table_name(table))}::regclass\n        AND cons.contype = 'p'\n        AND pg_get_expr(def.adbin, def.adrelid) ~* 'nextval|uuid_generate|gen_random_uuid'\n    SQL\n  end\n\n  pk = result.shift\n  if result.last\n    [pk, PostgreSQL::Name.new(*result)]\n  else\n    [pk, nil]\n  end\nrescue\n  nil\nend\n", "SCHEMA")[0]

#primary_keys(table_name) ⇒ Object

:nodoc:



435
436
437
438
439
440
441
442
443
444
445
446
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 435

def primary_keys(table_name) # :nodoc:
  query_values("    SELECT a.attname\n    FROM pg_index i\n    JOIN pg_attribute a\n      ON a.attrelid = i.indrelid\n      AND a.attnum = ANY(i.indkey)\n    WHERE i.indrelid = \#{quote(quote_table_name(table_name))}::regclass\n      AND i.indisprimary\n    ORDER BY array_position(i.indkey, a.attnum)\n  SQL\nend\n", "SCHEMA")

#quoted_include_columns_for_index(column_names) ⇒ Object

:nodoc:



981
982
983
984
985
986
987
988
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 981

def quoted_include_columns_for_index(column_names) # :nodoc:
  return quote_column_name(column_names) if column_names.is_a?(Symbol)

  quoted_columns = column_names.each_with_object({}) do |name, result|
    result[name.to_sym] = quote_column_name(name).dup
  end
  add_options_for_index_columns(quoted_columns).values.join(", ")
end

#recreate_database(name, options = {}) ⇒ Object

Drops the database specified on the name attribute and creates it again using the provided options.



9
10
11
12
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 9

def recreate_database(name, options = {}) # :nodoc:
  drop_database(name)
  create_database(name, options)
end

#remove_exclusion_constraint(table_name, expression = nil, **options) ⇒ Object

Removes the given exclusion constraint from the table.

remove_exclusion_constraint :products, name: "price_check"

The expression parameter will be ignored if present. It can be helpful to provide this in a migration’s change method so it can be reverted. In that case, expression will be used by #add_exclusion_constraint.



805
806
807
808
809
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 805

def remove_exclusion_constraint(table_name, expression = nil, **options)
  excl_name_to_delete = exclusion_constraint_for!(table_name, expression: expression, **options).name

  remove_constraint(table_name, excl_name_to_delete)
end

#remove_index(table_name, column_name = nil, **options) ⇒ Object

:nodoc:



563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 563

def remove_index(table_name, column_name = nil, **options) # :nodoc:
  table = Utils.extract_schema_qualified_name(table_name.to_s)

  if options.key?(:name)
    provided_index = Utils.extract_schema_qualified_name(options[:name].to_s)

    options[:name] = provided_index.identifier
    table = PostgreSQL::Name.new(provided_index.schema, table.identifier) unless table.schema.present?

    if provided_index.schema.present? && table.schema != provided_index.schema
      raise ArgumentError.new("Index schema '#{provided_index.schema}' does not match table schema '#{table.schema}'")
    end
  end

  return if options[:if_exists] && !index_exists?(table_name, column_name, **options)

  index_to_remove = PostgreSQL::Name.new(table.schema, index_name_for_remove(table.to_s, column_name, options))

  execute "DROP INDEX #{index_algorithm(options[:algorithm])} #{quote_table_name(index_to_remove)}"
end

#remove_unique_constraint(table_name, column_name = nil, **options) ⇒ Object

Removes the given unique constraint from the table.

remove_unique_constraint :sections, name: "unique_position"

The column_name parameter will be ignored if present. It can be helpful to provide this in a migration’s change method so it can be reverted. In that case, column_name will be used by #add_unique_constraint.



860
861
862
863
864
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 860

def remove_unique_constraint(table_name, column_name = nil, **options)
  unique_name_to_delete = unique_constraint_for!(table_name, column: column_name, **options).name

  remove_constraint(table_name, unique_name_to_delete)
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

Renames a column in a table.



543
544
545
546
547
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 543

def rename_column(table_name, column_name, new_column_name) # :nodoc:
  clear_cache!
  execute("ALTER TABLE #{quote_table_name(table_name)} #{rename_column_sql(table_name, column_name, new_column_name)}")
  rename_column_indexes(table_name, column_name, new_column_name)
end

#rename_index(table_name, old_name, new_name) ⇒ Object

Renames an index of a table. Raises error if length of new index name is greater than allowed limit.



586
587
588
589
590
591
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 586

def rename_index(table_name, old_name, new_name)
  validate_index_length!(table_name, new_name)

  schema, = extract_schema_qualified_name(table_name)
  execute "ALTER INDEX #{quote_table_name(schema) + '.' if schema}#{quote_column_name(old_name)} RENAME TO #{quote_table_name(new_name)}"
end

#rename_schema(schema_name, new_name) ⇒ Object

Renames the schema for the given schema name.



291
292
293
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 291

def rename_schema(schema_name, new_name)
  execute "ALTER SCHEMA #{quote_schema_name(schema_name)} RENAME TO #{quote_schema_name(new_name)}"
end

#rename_table(table_name, new_name, **options) ⇒ Object

Renames a table. Also renames a table’s primary key sequence if the sequence name exists and matches the Active Record default.

Example:

rename_table('octopuses', 'octopi')



454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 454

def rename_table(table_name, new_name, **options)
  validate_table_length!(new_name) unless options[:_uses_legacy_table_name]
  clear_cache!
  schema_cache.clear_data_source_cache!(table_name.to_s)
  schema_cache.clear_data_source_cache!(new_name.to_s)
  execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
  pk, seq = pk_and_sequence_for(new_name)
  if pk
    # PostgreSQL automatically creates an index for PRIMARY KEY with name consisting of
    # truncated table name and "_pkey" suffix fitting into max_identifier_length number of characters.
    max_pkey_prefix = max_identifier_length - "_pkey".size
    idx = "#{table_name[0, max_pkey_prefix]}_pkey"
    new_idx = "#{new_name[0, max_pkey_prefix]}_pkey"
    execute "ALTER INDEX #{quote_table_name(idx)} RENAME TO #{quote_table_name(new_idx)}"

    # PostgreSQL automatically creates a sequence for PRIMARY KEY with name consisting of
    # truncated table name and "#{primary_key}_seq" suffix fitting into max_identifier_length number of characters.
    max_seq_prefix = max_identifier_length - "_#{pk}_seq".size
    if seq && seq.identifier == "#{table_name[0, max_seq_prefix]}_#{pk}_seq"
      new_seq = "#{new_name[0, max_seq_prefix]}_#{pk}_seq"
      execute "ALTER TABLE #{seq.quoted} RENAME TO #{quote_table_name(new_seq)}"
    end
  end
  rename_table_indexes(table_name, new_name, **options)
end

#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object

Resets the sequence of a table’s primary key to the maximum value.



354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 354

def reset_pk_sequence!(table, pk = nil, sequence = nil) # :nodoc:
  unless pk && sequence
    default_pk, default_sequence = pk_and_sequence_for(table)

    pk ||= default_pk
    sequence ||= default_sequence
  end

  if @logger && pk && !sequence
    @logger.warn "#{table} has primary key #{pk} with no default sequence."
  end

  if pk && sequence
    quoted_sequence = quote_table_name(sequence)
    max_pk = query_value("SELECT MAX(#{quote_column_name pk}) FROM #{quote_table_name(table)}", "SCHEMA")
    if max_pk.nil?
      if database_version >= 10_00_00
        minvalue = query_value("SELECT seqmin FROM pg_sequence WHERE seqrelid = #{quote(quoted_sequence)}::regclass", "SCHEMA")
      else
        minvalue = query_value("SELECT min_value FROM #{quoted_sequence}", "SCHEMA")
      end
    end

    internal_execute("SELECT setval(#{quote(quoted_sequence)}, #{max_pk || minvalue}, #{max_pk ? true : false})", "SCHEMA")
  end
end

#schema_creation ⇒ Object

:nodoc:



990
991
992
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 990

def schema_creation  # :nodoc:
  PostgreSQL::SchemaCreation.new(self)
end

#schema_exists?(name) ⇒ Boolean

Returns true if schema exists.

Returns:

  • (Boolean) 


68
69
70
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 68

def schema_exists?(name)
  query_value("SELECT COUNT(*) FROM pg_namespace WHERE nspname = #{quote(name)}", "SCHEMA").to_i > 0
end

#schema_names ⇒ Object

Returns an array of schema names.



262
263
264
265
266
267
268
269
270
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 262

def schema_names
  query_values("    SELECT nspname\n      FROM pg_namespace\n     WHERE nspname !~ '^pg_.*'\n       AND nspname NOT IN ('information_schema')\n     ORDER by nspname;\n  SQL\nend\n", "SCHEMA")

#schema_search_path ⇒ Object

Returns the active schema search path.



309
310
311
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 309

def schema_search_path
  @schema_search_path ||= query_value("SHOW search_path", "SCHEMA")
end

#schema_search_path=(schema_csv) ⇒ Object

Sets the schema search path to a string of comma-separated schema names. Names beginning with $ have to be quoted (e.g. $user => ‘$user’). See: www.postgresql.org/docs/current/static/ddl-schemas.html

This should be not be called manually but set in database.yml.



300
301
302
303
304
305
306
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 300

def schema_search_path=(schema_csv)
  return if schema_csv == @schema_search_path
  if schema_csv
    internal_execute("SET search_path TO #{schema_csv}")
    @schema_search_path = schema_csv
  end
end

#serial_sequence(table, column) ⇒ Object 



334
335
336
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 334

def serial_sequence(table, column)
  query_value("SELECT pg_get_serial_sequence(#{quote(table)}, #{quote(column)})", "SCHEMA")
end

#set_pk_sequence!(table, value) ⇒ Object

Sets the sequence of a table’s primary key to the specified value.



339
340
341
342
343
344
345
346
347
348
349
350
351
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 339

def set_pk_sequence!(table, value) # :nodoc:
  pk, sequence = pk_and_sequence_for(table)

  if pk
    if sequence
      quoted_sequence = quote_table_name(sequence)

      internal_execute("SELECT setval(#{quote(quoted_sequence)}, #{value})", "SCHEMA")
    else
      @logger.warn "#{table} has primary key #{pk} with no default sequence." if @logger
    end
  end
end

#table_comment(table_name) ⇒ Object

Returns a comment stored in database for given table



184
185
186
187
188
189
190
191
192
193
194
195
196
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 184

def table_comment(table_name) # :nodoc:
  scope = quoted_scope(table_name, type: "BASE TABLE")
  if scope[:name]
    query_value("      SELECT pg_catalog.obj_description(c.oid, 'pg_class')\n      FROM pg_catalog.pg_class c\n        LEFT JOIN pg_namespace n ON n.oid = c.relnamespace\n      WHERE c.relname = \#{scope[:name]}\n        AND c.relkind IN (\#{scope[:type]})\n        AND n.nspname = \#{scope[:schema]}\n    SQL\n  end\nend\n", "SCHEMA")

#table_options(table_name) ⇒ Object

:nodoc:



163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 163

def table_options(table_name) # :nodoc:
  options = {}

  comment = table_comment(table_name)

  options[:comment] = comment if comment

  inherited_table_names = inherited_table_names(table_name).presence

  options[:options] = "INHERITS (#{inherited_table_names.join(", ")})" if inherited_table_names

  if !options[:options] && supports_native_partitioning?
    partition_definition = table_partition_definition(table_name)

    options[:options] = "PARTITION BY #{partition_definition}" if partition_definition
  end

  options
end

#table_partition_definition(table_name) ⇒ Object

Returns the partition definition of a given table



199
200
201
202
203
204
205
206
207
208
209
210
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 199

def table_partition_definition(table_name) # :nodoc:
  scope = quoted_scope(table_name, type: "BASE TABLE")

  query_value("    SELECT pg_catalog.pg_get_partkeydef(c.oid)\n    FROM pg_catalog.pg_class c\n      LEFT JOIN pg_namespace n ON n.oid = c.relnamespace\n    WHERE c.relname = \#{scope[:name]}\n      AND c.relkind IN (\#{scope[:type]})\n      AND n.nspname = \#{scope[:schema]}\n  SQL\nend\n", "SCHEMA")

#type_to_sql(type, limit: nil, precision: nil, scale: nil, array: nil, enum_type: nil) ⇒ Object

Maps logical Rails types to PostgreSQL-specific data types.



867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 867

def type_to_sql(type, limit: nil, precision: nil, scale: nil, array: nil, enum_type: nil, **) # :nodoc:
  sql = \
    case type.to_s
    when "binary"
      # PostgreSQL doesn't support limits on binary (bytea) columns.
      # The hard limit is 1GB, because of a 32-bit size field, and TOAST.
      case limit
      when nil, 0..0x3fffffff; super(type)
      else raise ArgumentError, "No binary type has byte size #{limit}. The limit on binary can be at most 1GB - 1byte."
      end
    when "text"
      # PostgreSQL doesn't support limits on text columns.
      # The hard limit is 1GB, according to section 8.3 in the manual.
      case limit
      when nil, 0..0x3fffffff; super(type)
      else raise ArgumentError, "No text type has byte size #{limit}. The limit on text can be at most 1GB - 1byte."
      end
    when "integer"
      case limit
      when 1, 2; "smallint"
      when nil, 3, 4; "integer"
      when 5..8; "bigint"
      else raise ArgumentError, "No integer type has byte size #{limit}. Use a numeric with scale 0 instead."
      end
    when "enum"
      raise ArgumentError, "enum_type is required for enums" if enum_type.nil?

      enum_type
    else
      super
    end

  sql = "#{sql}[]" if array && type != :primary_key
  sql
end

#unique_constraint_options(table_name, column_name, options) ⇒ Object

:nodoc:



841
842
843
844
845
846
847
848
849
850
851
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 841

def unique_constraint_options(table_name, column_name, options) # :nodoc:
  assert_valid_deferrable(options[:deferrable])

  if column_name && options[:using_index]
    raise ArgumentError, "Cannot specify both column_name and :using_index options."
  end

  options = options.dup
  options[:name] ||= unique_constraint_name(table_name, column: column_name, **options)
  options
end

#unique_constraints(table_name) ⇒ Object

Returns an array of unique constraints for the given table. The unique constraints are represented as UniqueConstraintDefinition objects.



726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 726

def unique_constraints(table_name)
  scope = quoted_scope(table_name)

  unique_info = internal_exec_query("    SELECT c.conname, c.conrelid, c.condeferrable, c.condeferred, pg_get_constraintdef(c.oid) AS constraintdef,\n    (\n      SELECT array_agg(a.attname ORDER BY idx)\n      FROM (\n        SELECT idx, c.conkey[idx] AS conkey_elem\n        FROM generate_subscripts(c.conkey, 1) AS idx\n      ) indexed_conkeys\n      JOIN pg_attribute a ON a.attrelid = t.oid\n      AND a.attnum = indexed_conkeys.conkey_elem\n    ) AS conkey_names\n    FROM pg_constraint c\n    JOIN pg_class t ON c.conrelid = t.oid\n    JOIN pg_namespace n ON n.oid = c.connamespace\n    WHERE c.contype = 'u'\n      AND t.relname = \#{scope[:name]}\n      AND n.nspname = \#{scope[:schema]}\n  SQL\n\n  unique_info.map do |row|\n    columns = decode_string_array(row[\"conkey_names\"])\n\n    nulls_not_distinct = row[\"constraintdef\"].start_with?(\"UNIQUE NULLS NOT DISTINCT\")\n    deferrable = extract_constraint_deferrable(row[\"condeferrable\"], row[\"condeferred\"])\n\n    options = {\n      name: row[\"conname\"],\n      nulls_not_distinct: nulls_not_distinct,\n      deferrable: deferrable\n    }\n\n    UniqueConstraintDefinition.new(table_name, columns, options)\n  end\nend\n", "SCHEMA", allow_retry: true, materialize_transactions: false)

#update_table_definition(table_name, base) ⇒ Object

:nodoc:



917
918
919
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 917

def update_table_definition(table_name, base) # :nodoc:
  PostgreSQL::Table.new(table_name, base)
end

#validate_check_constraint(table_name, **options) ⇒ Object

Validates the given check constraint.

validate_check_constraint :products, name: "price_check"

The options hash accepts the same keys as add_check_constraint.



963
964
965
966
967
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 963

def validate_check_constraint(table_name, **options)
  chk_name_to_validate = check_constraint_for!(table_name, **options).name

  validate_constraint table_name, chk_name_to_validate
end

#validate_constraint(table_name, constraint_name) ⇒ Object

Validates the given constraint.

Validates the constraint named constraint_name on accounts.

validate_constraint :accounts, :constraint_name



930
931
932
933
934
935
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 930

def validate_constraint(table_name, constraint_name)
  at = create_alter_table table_name
  at.validate_constraint constraint_name

  execute schema_creation.accept(at)
end

#validate_foreign_key(from_table, to_table = nil, **options) ⇒ Object

Validates the given foreign key.

Validates the foreign key on accounts.branch_id.

validate_foreign_key :accounts, :branches

Validates the foreign key on accounts.owner_id.

validate_foreign_key :accounts, column: :owner_id

Validates the foreign key named special_fk_name on the accounts table.

validate_foreign_key :accounts, name: :special_fk_name

The options hash accepts the same keys as SchemaStatements#add_foreign_key.



952
953
954
955
956
 
# File 'lib/active_record/connection_adapters/postgresql/schema_statements.rb', line 952

def validate_foreign_key(from_table, to_table = nil, **options)
  fk_name_to_validate = foreign_key_for!(from_table, to_table: to_table, **options).name

  validate_constraint from_table, fk_name_to_validate
end