From 0e6888232a19c8c59416490d3da6079e590fab77 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 12 Mar 2010 15:25:21 -0800 Subject: Add support for a NOT predicate --- lib/arel/algebra/attributes/attribute.rb | 4 ++++ lib/arel/algebra/predicates.rb | 1 + lib/arel/engines/memory/predicates.rb | 6 ++++++ lib/arel/engines/sql/predicates.rb | 4 ++++ 4 files changed, 15 insertions(+) (limited to 'lib') diff --git a/lib/arel/algebra/attributes/attribute.rb b/lib/arel/algebra/attributes/attribute.rb index 03cf44a552..b372be5e1d 100644 --- a/lib/arel/algebra/attributes/attribute.rb +++ b/lib/arel/algebra/attributes/attribute.rb @@ -86,6 +86,10 @@ module Arel Predicates::Equality.new(self, other) end + def not(other) + Predicates::Not.new(self, other) + end + def lt(other) Predicates::LessThan.new(self, other) end diff --git a/lib/arel/algebra/predicates.rb b/lib/arel/algebra/predicates.rb index 8a0b41fa18..700cd6afaa 100644 --- a/lib/arel/algebra/predicates.rb +++ b/lib/arel/algebra/predicates.rb @@ -33,6 +33,7 @@ module Arel end end + class Not < Binary; end class GreaterThanOrEqualTo < Binary; end class GreaterThan < Binary; end class LessThanOrEqualTo < Binary; end diff --git a/lib/arel/engines/memory/predicates.rb b/lib/arel/engines/memory/predicates.rb index dd2559c70f..f87bf68357 100644 --- a/lib/arel/engines/memory/predicates.rb +++ b/lib/arel/engines/memory/predicates.rb @@ -10,6 +10,12 @@ module Arel def operator; :== end end + class Not < Binary + def eval(row) + operand1.eval(row) != operand2.eval(row) + end + end + class GreaterThanOrEqualTo < Binary def operator; :>= end end diff --git a/lib/arel/engines/sql/predicates.rb b/lib/arel/engines/sql/predicates.rb index e563a9ba3e..3756231a46 100644 --- a/lib/arel/engines/sql/predicates.rb +++ b/lib/arel/engines/sql/predicates.rb @@ -26,6 +26,10 @@ module Arel end end + class Not < Binary + def predicate_sql; '!=' end + end + class GreaterThanOrEqualTo < Binary def predicate_sql; '>=' end end -- cgit v1.2.3