Module: PGSpecHelper::UniqueConstraints

Included in:
PGSpecHelper
Defined in:
lib/pg_spec_helper/unique_constraints.rb

Instance Method Summary collapse

Instance Method Details

#create_unique_constraint(schema_name, table_name, column_names, constraint_key_name) ⇒ Object

add a unique constraint to the provided table and columns



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# File 'lib/pg_spec_helper/unique_constraints.rb', line 6

def create_unique_constraint schema_name, table_name, column_names, constraint_key_name
  column_names_sql = column_names.map { |n| connection.quote_ident n.to_s }.join(", ")
  # add the constraint key
  connection.exec(<<~SQL)
    ALTER TABLE #{connection.quote_ident schema_name.to_s}.#{connection.quote_ident table_name.to_s}
      ADD CONSTRAINT #{connection.quote_ident constraint_key_name.to_s}
      UNIQUE (#{column_names_sql})
  SQL
end

#get_unique_constraint_names(schema_name, table_name) ⇒ Object

get a list of unique constraints for the provided table



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# File 'lib/pg_spec_helper/unique_constraints.rb', line 17

def get_unique_constraint_names schema_name, table_name
  # get the unique constraint names
  rows = connection.exec(<<~SQL, [schema_name.to_s, table_name.to_s])
    SELECT
      constraint_name
    FROM
      information_schema.table_constraints
    WHERE
      table_schema = $1
      AND table_name = $2
      AND constraint_type = 'UNIQUE'
  SQL
  rows.map { |r| r["constraint_name"].to_sym }
end