diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/arel/algebra/relations/operations/join.rb | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/arel/algebra/relations/operations/join.rb b/lib/arel/algebra/relations/operations/join.rb index 695f360b51..02a8fa629d 100644 --- a/lib/arel/algebra/relations/operations/join.rb +++ b/lib/arel/algebra/relations/operations/join.rb @@ -2,7 +2,7 @@ module Arel class Join < Relation attributes :relation1, :relation2, :predicates deriving :== - delegate :engine, :name, :to => :relation1 + delegate :name, :to => :relation1 hash_on :relation1 def initialize(relation1, relation2 = Nil.instance, *predicates) @@ -31,6 +31,10 @@ module Arel def join? true end + + def engine + relation1.engine != relation2.engine ? Memory::Engine.new : relation1.engine + end end class InnerJoin < Join; end @@ -39,6 +43,10 @@ module Arel def attributes relation1.externalize.attributes end + + def engine + relation1.engine + end end class Relation |