module ActiveRecord::PGEnum::PostgreSQLAdapter

Public Instance Methods

enum_types() click to toggle source

Helper method used by the monkeypatch internals. Provides a hash of ENUM types as they exist currently.

Example:

{ "foo_type" => ["foo", "bar", "baz"] }
# File lib/active_record/pg_enum/postgresql_adapter.rb, line 15
      def enum_types
        res = exec_query(<<-SQL.strip_heredoc, "SCHEMA")
          SELECT t.typname AS enum_name, array_agg(e.enumlabel ORDER BY e.enumsortorder) AS enum_value
          FROM pg_type t
          JOIN pg_enum e ON t.oid = e.enumtypid
          JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
          WHERE n.nspname = ANY (current_schemas(false))
          GROUP BY enum_name;
        SQL

        coltype = res.column_types["enum_value"]
        deserialize = if coltype.respond_to?(:deserialize)
          proc { |values| coltype.deserialize(values) }
        elsif coltype.respond_to?(:type_cast_from_database)
          proc { |values| coltype.type_cast_from_database(values) }
        else
          proc { |values| coltype.type_cast(values) }
        end

        res.rows
          .map { |name, values| [name, values] }
          .sort { |a, b| a.first <=> b.first }
          .each_with_object({}) { |(name, values), memo| memo[name] = deserialize.call(values) }
      end