Class: ActiveRecord::ConnectionAdapters::PostgreSQLColumn

Inherits:
Column
  • Object
show all
Extended by:
ArrayParser, Cast
Defined in:
lib/active_record/connection_adapters/postgresql_adapter.rb,
lib/active_record/connection_adapters/postgresql/cast.rb,
lib/active_record/connection_adapters/postgresql/array_parser.rb

Overview

PostgreSQL-specific extensions to column definitions in a table.

Defined Under Namespace

Modules: ArrayParser, Cast

Constant Summary

Constants inherited from Column

Column::FALSE_VALUES, Column::TRUE_VALUES

Class Attribute Summary collapse

Instance Attribute Summary collapse

Attributes inherited from Column

#coder, #default, #default_function, #limit, #name, #null, #precision, #primary, #scale, #sql_type, #type

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Cast

array_to_string, cidr_to_string, hstore_to_string, json_to_string, point_to_string, range_to_string, string_to_array, string_to_bit, string_to_cidr, string_to_hstore, string_to_json, string_to_point, string_to_time

Methods inherited from Column

#binary?, binary_to_string, #extract_default, #has_default?, #human_name, #klass, string_to_binary, #string_to_binary, string_to_dummy_time, string_to_time, #type_cast_code, #type_cast_for_write, value_to_boolean, value_to_date, value_to_decimal, value_to_integer

Constructor Details

#initialize(name, default, oid_type, sql_type = nil, null = true) ⇒ PostgreSQLColumn

Returns a new instance of PostgreSQLColumn.



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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 50

def initialize(name, default, oid_type, sql_type = nil, null = true)
  @oid_type = oid_type
  default_value     = self.class.extract_value_from_default(default)

  if sql_type =~ /\[\]$/
    @array = true
    super(name, default_value, sql_type[0..sql_type.length - 3], null)
  else
    @array = false
    super(name, default_value, sql_type, null)
  end

  @default_function = default if has_default_function?(default_value, default)
end

Class Attribute Details

.money_precision ⇒ Object

Returns the value of attribute money_precision.



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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 77

def money_precision
  @money_precision
end

Instance Attribute Details

#array ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 48

def array
  @array
end

Class Method Details

.extract_value_from_default(default) ⇒ Object

Extracts the value from a PostgreSQL column default definition.



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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 82

def self.extract_value_from_default(default)
  # This is a performance optimization for Ruby 1.9.2 in development.
  # If the value is nil, we return nil straight away without checking
  # the regular expressions. If we check each regular expression,
  # Regexp#=== will call NilClass#to_str, which will trigger
  # method_missing (defined by whiny nil in ActiveSupport) which
  # makes this method very very slow.
  return default unless default

  case default
    when /\A'(.*)'::(num|date|tstz|ts|int4|int8)range\z/m
      $1
    # Numeric types
    when /\A\(?(-?\d+(\.\d*)?\)?(::bigint)?)\z/
      $1
    # Character types
    when /\A\(?'(.*)'::.*\b(?:character varying|bpchar|text)\z/m
      $1
    # Binary data types
    when /\A'(.*)'::bytea\z/m
      $1
    # Date/time types
    when /\A'(.+)'::(?:time(?:stamp)? with(?:out)? time zone|date)\z/
      $1
    when /\A'(.*)'::interval\z/
      $1
    # Boolean type
    when 'true'
      true
    when 'false'
      false
    # Geometric types
    when /\A'(.*)'::(?:point|line|lseg|box|"?path"?|polygon|circle)\z/
      $1
    # Network address types
    when /\A'(.*)'::(?:cidr|inet|macaddr)\z/
      $1
    # Bit string types
    when /\AB'(.*)'::"?bit(?: varying)?"?\z/
      $1
    # XML type
    when /\A'(.*)'::xml\z/m
      $1
    # Arrays
    when /\A'(.*)'::"?\D+"?\[\]\z/
      $1
    # Hstore
    when /\A'(.*)'::hstore\z/
      $1
    # JSON
    when /\A'(.*)'::json\z/
      $1
    # Object identifier types
    when /\A-?\d+\z/
      $1
    else
      # Anything else is blank, some user type, or some function
      # and we can't know the value of that, so return nil.
      nil
  end
end

Instance Method Details

#number? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 65

def number?
  !array && super
end

#text? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 69

def text?
  !array && super
end

#type_cast(value) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgresql_adapter.rb', line 144

def type_cast(value)
  return if value.nil?
  return super if encoded?

  @oid_type.type_cast value
end