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module Arel
class Compound
include Relation
attr_reader :relation, :engine
def initialize relation
@relation = relation
@engine = relation.engine
@attributes = nil
@wheres = nil
@groupings = nil
@orders = nil
@havings = nil
@projections = nil
end
def join?; @relation.join? end
def name; @relation.name end
def table_alias; @relation.table_alias end
def skipped; @relation.skipped end
def taken; @relation.taken end
def joins env; @relation.joins env end
def column_for attr; @relation.column_for attr end
def externalizable?; @relation.externalizable? end
def sources
@relation.sources
end
def table
@relation.table
end
def table_sql(formatter = Sql::TableReference.new(self))
@relation.table_sql formatter
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
end
end
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