Module: ActiveRecord::ConnectionAdapters::ConstraintConnectionHook

Included in:
Base
Defined in:
lib/activerecord_constraint_handlers.rb

Overview

This module is included in ActiveRecord::Base. The example provided is for PostgreSQL. During the connect, the adapter specific connection routine is called. The name of that routine is the the adapter type with _connection appened. e.g. postgresql_connection

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/activerecord_constraint_handlers.rb', line 261

def self.included(base)
  base.class_eval {
    class << self
      # An example for the postgresql adapter.  Other adapters
      # need only add to this list with the proper name.
      def postgresql_connection_with_constraints(config)
        ActiveRecord::Base.logger.debug("IN: ConstraintConnectionHook::postgresql_connection_with_constraints #{self}")
        # Pass the call up the chain
        v = postgresql_connection_without_constraints(config)

        # After we return, add in Postgres' constraint handlers
        # into "self".  Usually this will be ActiveRecord::Base
        # but I think if Model.establish_connection is called,
        # then self will be Model.
        include ConstraintHandlers::Postgresql

        # Return the original result.
        v
      end
      alias_method_chain :postgresql_connection, :constraints
    end
  }
end