Method: Sequel::Postgres::DatabaseMethods#foreign_key_list

Defined in:

lib/sequel/adapters/shared/postgres.rb

#foreign_key_list(table, opts = OPTS) ⇒ Object

Return full foreign key information using the pg system tables, including :name, :on_delete, :on_update, and :deferrable entries in the hashes.

Supports additional options:

:reverse

Instead of returning foreign keys in the current table, return foreign keys in other tables that reference the current table.

:schema

Set to true to have the :table value in the hashes be a qualified identifier. Set to false to use a separate :schema value with the related schema. Defaults to whether the given table argument is a qualified identifier.

# File 'lib/sequel/adapters/shared/postgres.rb', line 578

def foreign_key_list(table, opts=OPTS)
  m = output_identifier_meth
  schema, _ = opts.fetch(:schema, schema_and_table(table))

  h = {}
  fklod_map = FOREIGN_KEY_LIST_ON_DELETE_MAP 
  reverse = opts[:reverse]

  (reverse ? _reverse_foreign_key_list_ds : _foreign_key_list_ds).where_each(Sequel[:cl][:oid]=>regclass_oid(table)) do |row|
    if reverse
      key = [row[:schema], row[:table], row[:name]]
    else
      key = row[:name]
    end

    if r = h[key]
      r[:columns] << m.call(row[:column])
      r[:key] << m.call(row[:refcolumn])
    else
      entry = h[key] = {
        :name=>m.call(row[:name]),
        :columns=>[m.call(row[:column])],
        :key=>[m.call(row[:refcolumn])],
        :on_update=>fklod_map[row[:on_update]],
        :on_delete=>fklod_map[row[:on_delete]],
        :deferrable=>row[:deferrable],
        :table=>schema ? SQL::QualifiedIdentifier.new(m.call(row[:schema]), m.call(row[:table])) : m.call(row[:table]),
      }

      unless schema
        # If not combining schema information into the :table entry
        # include it as a separate entry.
        entry[:schema] = m.call(row[:schema])
      end
    end
  end

  h.values
end