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require 'active_support/core_ext/module/delegation'
module ActiveRecord
module Delegation
# Set up common delegations for performance (avoids method_missing)
delegate :to_xml, :to_yaml, :length, :collect, :map, :each, :all?, :include?, :to_ary, :to => :to_a
delegate :table_name, :quoted_table_name, :primary_key, :quoted_primary_key,
:connection, :columns_hash, :auto_explain_threshold_in_seconds, :to => :klass
def self.delegate_to_scoped_klass(method)
if method.to_s =~ /\A[a-zA-Z_]\w*[!?]?\z/
module_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{method}(*args, &block)
scoping { @klass.#{method}(*args, &block) }
end
RUBY
else
module_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{method}(*args, &block)
scoping { @klass.send(#{method.inspect}, *args, &block) }
end
RUBY
end
end
def respond_to?(method, include_private = false)
super || Array.method_defined?(method) ||
@klass.respond_to?(method, include_private) ||
arel.respond_to?(method, include_private)
end
protected
def method_missing(method, *args, &block)
if @klass.respond_to?(method)
::ActiveRecord::Delegation.delegate_to_scoped_klass(method)
scoping { @klass.send(method, *args, &block) }
elsif Array.method_defined?(method)
::ActiveRecord::Delegation.delegate method, :to => :to_a
to_a.send(method, *args, &block)
elsif arel.respond_to?(method)
::ActiveRecord::Delegation.delegate method, :to => :arel
arel.send(method, *args, &block)
else
super
end
end
end
end
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