Allow to unscope where conditions using `arel_table` with Symbol

This commit fixes the following case.

    User.where(User.arel_table[:created_at].lteq(1.year.ago)).unscope(where :created_at)

2 files changed, 9 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb
index d58af01339..365851ada5 100644
--- a/activerecord/lib/active_record/relation/query_methods.rb
+++ b/activerecord/lib/active_record/relation/query_methods.rb
@@ -909,7 +909,7 @@ module ActiveRecord
         case rel
         when Arel::Nodes::Between, Arel::Nodes::In, Arel::Nodes::NotIn, Arel::Nodes::Equality, Arel::Nodes::NotEqual, Arel::Nodes::LessThanOrEqual, Arel::Nodes::GreaterThanOrEqual
           subrelation = (rel.left.kind_of?(Arel::Attributes::Attribute) ? rel.left : rel.right)
-          subrelation.name == target_value
+          subrelation.name.to_s == target_value
         end
       end
 
diff --git a/activerecord/test/cases/scoping/default_scoping_test.rb b/activerecord/test/cases/scoping/default_scoping_test.rb
index 5bdebe6ac7..0738df1b54 100644
--- a/activerecord/test/cases/scoping/default_scoping_test.rb
+++ b/activerecord/test/cases/scoping/default_scoping_test.rb
@@ -143,6 +143,14 @@ class DefaultScopingTest < ActiveRecord::TestCase
     expected_5 = Developer.order('salary DESC').collect(&:name)
     received_5 = DeveloperOrderedBySalary.where.not("name" => ["Jamis", "David"]).unscope(where: :name).collect(&:name)
     assert_equal expected_5, received_5
+
+    expected_6 = Developer.order('salary DESC').collect(&:name)
+    received_6 = DeveloperOrderedBySalary.where(Developer.arel_table['name'].eq('David')).unscope(where: :name).collect(&:name)
+    assert_equal expected_6, received_6
+
+    expected_7 = Developer.order('salary DESC').collect(&:name)
+    received_7 = DeveloperOrderedBySalary.where(Developer.arel_table[:name].eq('David')).unscope(where: :name).collect(&:name)
+    assert_equal expected_7, received_7
   end
 
   def test_unscope_multiple_where_clauses