Fix issue #7526. Reload the target if it's stale.

* This has been fixed at master via `365b8b6`, but not at 3-2-stable branch.

* @stale_state should be nil when a model isn't saved. via `0f3901e`.

* set @stale_state to nil when reset the target.

1 files changed, 14 insertions, 0 deletions

diff --git a/activerecord/test/cases/associations/belongs_to_associations_test.rb b/activerecord/test/cases/associations/belongs_to_associations_test.rb
index f392366c19..c9b26895ae 100644
--- a/activerecord/test/cases/associations/belongs_to_associations_test.rb
+++ b/activerecord/test/cases/associations/belongs_to_associations_test.rb
@@ -14,6 +14,8 @@ require 'models/sponsor'
 require 'models/member'
 require 'models/essay'
 require 'models/toy'
+require 'models/person'
+require 'models/reader'
 
 class BelongsToAssociationsTest < ActiveRecord::TestCase
   fixtures :accounts, :companies, :developers, :projects, :topics,
@@ -716,4 +718,16 @@ class BelongsToAssociationsTest < ActiveRecord::TestCase
 
     assert_equal toy, sponsor.reload.sponsorable
   end
+
+  def test_saving_nested_association
+    post1, post2 = Post.limit(2)
+    person = Person.new(:first_name => 'foo')
+    reader = Reader.new(:post => post1)
+
+    reader.post_id = post2.id
+    person.readers = [reader]
+
+    assert person.save
+    assert_equal reader.post_id, post2.id
+  end
 end