Fix #4979 against 3-2-stable - delete_all raise an error if a limit is provided

activerecord/lib/active_record/relation.rb

@@ -403,6 +403,8 @@ module ActiveRecord
     # If you need to destroy dependent associations or call your <tt>before_*</tt> or
     # +after_destroy+ callbacks, use the +destroy_all+ method instead.
     def delete_all(conditions = nil)
+      raise ActiveRecordError.new("delete_all doesn't support limit scope") if self.limit_value
+
       IdentityMap.repository[symbolized_base_class] = {} if IdentityMap.enabled?
       if conditions
         where(conditions).delete_all

activerecord/test/cases/relations_test.rb

@@ -643,6 +643,10 @@ class RelationTest < ActiveRecord::TestCase
     assert davids.loaded?
   end
 
+  def test_delete_all_limit_error
+    assert_raises(ActiveRecord::ActiveRecordError) { Author.limit(10).delete_all }
+  end
+
   def test_select_argument_error
     assert_raises(ArgumentError) { Developer.select }
   end