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don't cache invalid subsets when preloading hmt associations.

closes #8423.
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1 parent 1fd7830 commit 4a4ff504590adfb516502ea332ad0608652b3519 @senny senny committed Feb 11, 2013
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22 activerecord/CHANGELOG.md
@@ -1,5 +1,27 @@
## Rails 4.0.0 (unreleased) ##
+* Preloading `has_many :through` associations with conditions won't
+ cache the `:through` association. This will prevent invalid
+ subsets to be cached.
+ Fixes #8423.
+
+ Example:
+
+ class User
+ has_many :posts
+ has_many :recent_comments, -> { where('created_at > ?', 1.week.ago) }, :through => :posts
+ end
+
+ a_user = User.includes(:recent_comments).first
+
+ # this is preloaded
+ a_user.recent_comments
+
+ # fetching the recent_comments through the posts association won't preload it.
+ a_user.posts
+
+ *Yves Senn*
+
* Don't run after_commit callback when creating through an association
if saving the record fails.
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3 activerecord/lib/active_record/associations/preloader/through_association.rb
@@ -31,7 +31,8 @@ def through_records_by_owner
through_records = Array.wrap(owner.send(through_reflection.name))
# Dont cache the association - we would only be caching a subset
- if reflection.options[:source_type] && through_reflection.collection?
+ if (through_scope != through_reflection.klass.unscoped) ||
+ (reflection.options[:source_type] && through_reflection.collection?)
owner.association(through_reflection.name).reset
end
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6 activerecord/test/cases/associations/eager_test.rb
@@ -1162,4 +1162,10 @@ def test_deep_including_through_habtm
Post.where('1 = 0').scoping { Comment.preload(:post).find(1).post }
)
end
+
+ test "preloading does not cache has many association subset when preloaded with a through association" do
+ author = Author.includes(:comments_with_order_and_conditions, :posts).first
+ assert_no_queries { assert_equal 2, author.comments_with_order_and_conditions.size }
+ assert_no_queries { assert_equal 5, author.posts.size, "should not cache a subset of the association" }
+ end
end

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