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module Arel
class Compound
include Relation
attr_reader :relation
delegate :joins, :join?, :inserts, :taken, :skipped, :name, :externalizable?,
:column_for, :sources, :locked, :table_alias, :array,
:to => :relation
def initialize relation
@relation = relation
@attributes = nil
@wheres = nil
@groupings = nil
@orders = nil
@havings = nil
@projections = nil
end
[:wheres, :groupings, :orders, :havings, :projections].each do |operation_name|
class_eval <<-OPERATION, __FILE__, __LINE__
def #{operation_name}
@#{operation_name} ||= relation.#{operation_name}.collect { |o| o.bind(self) }
end
OPERATION
end
def attributes
@attributes ||= relation.attributes.bind(self)
end
def unoperated_rows
relation.call.collect { |row| row.bind(self) }
end
def engine
relation.engine
end
end
end
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