Add Relation#delete_all

activerecord/CHANGELOG

@@ -1,5 +1,9 @@
 *Edge*
 
+* Add Relation#delete_all. [Pratik Naik]
+
+  Item.where(:colour => 'red').delete_all
+
 * Add Model.having and Relation#having. [Pratik Naik]
 
   Developer.group("salary").having("sum(salary) >  10000").select("salary")

activerecord/lib/active_record/relation.rb

@@ -134,6 +134,7 @@ module ActiveRecord
 
       if [String, Hash, Array].include?(args.first.class)
         conditions = @klass.send(:merge_conditions, args.size > 1 ? Array.wrap(args) : args.first)
+        conditions = Arel::SqlLiteral.new(conditions) if conditions
       else
         conditions = args.first
       end
@@ -223,6 +224,11 @@ module ActiveRecord
       reset
     end
 
+    def delete_all
+      @relation.delete
+      reset
+    end
+
     def loaded?
       @loaded
     end

activerecord/test/cases/relations_test.rb

@@ -329,6 +329,26 @@ class RelationTest < ActiveRecord::TestCase
     assert davids.loaded?
   end
 
+  def test_delete_all
+    davids = Author.where(:name => 'David')
+
+    assert_difference('Author.count', -1) { davids.delete_all }
+    assert ! davids.loaded?
+  end
+
+  def test_delete_all_loaded
+    davids = Author.where(:name => 'David')
+
+    # Force load
+    assert_equal [authors(:david)], davids.to_a
+    assert davids.loaded?
+
+    assert_difference('Author.count', -1) { davids.delete_all }
+
+    assert_equal [], davids.to_a
+    assert davids.loaded?
+  end
+
   def test_relation_merging
     devs = Developer.where("salary >= 80000") & Developer.limit(2) & Developer.order('id ASC').where("id < 3")
     assert_equal [developers(:david), developers(:jamis)], devs.to_a