Fix #5667. Preloading should ignore scoping.

Conflicts:

	activerecord/test/cases/associations/eager_test.rb

3 files changed, 20 insertions, 2 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 16c525d211..ffd74893be 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,9 @@
+## Rails 3.2.4 (unreleased) ##
+
+*   Association preloading shouldn't be affected by the current scoping.
+    This could cause infinite recursion and potentially other problems.
+    See GH #5667. *Jon Leighton*
+
 ## Rails 3.2.3 (unreleased) ##
 
 *   Added find_or_create_by_{attribute}! dynamic method. *Andrew White*
diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb
index 779f8164cc..ab50e43ea0 100644
--- a/activerecord/lib/active_record/associations/preloader/association.rb
+++ b/activerecord/lib/active_record/associations/preloader/association.rb
@@ -77,7 +77,7 @@ module ActiveRecord
             # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000)
             # Make several smaller queries if necessary or make one query if the adapter supports it
             sliced  = owner_keys.each_slice(model.connection.in_clause_length || owner_keys.size)
-            records = sliced.map { |slice| records_for(slice) }.flatten
+            records = sliced.map { |slice| records_for(slice).to_a }.flatten
           end
 
           # Each record may have multiple owners, and vice-versa
@@ -93,7 +93,8 @@ module ActiveRecord
         end
 
         def build_scope
-          scope = klass.scoped
+          scope = klass.unscoped
+          scope.default_scoped = true
 
           scope = scope.where(process_conditions(options[:conditions]))
           scope = scope.where(process_conditions(preload_options[:conditions]))
diff --git a/activerecord/test/cases/associations/eager_test.rb b/activerecord/test/cases/associations/eager_test.rb
index 1dc71ac4cc..28bf1c60e5 100644
--- a/activerecord/test/cases/associations/eager_test.rb
+++ b/activerecord/test/cases/associations/eager_test.rb
@@ -1095,4 +1095,15 @@ class EagerAssociationTest < ActiveRecord::TestCase
       Post.includes(:comments).order(nil).where(:comments => {:body => "Thank you for the welcome"}).first
     end
   end
+
+  test "scoping with a circular preload" do
+    assert_equal Comment.find(1), Comment.preload(:post => :comments).scoping { Comment.find(1) }
+  end
+
+  test "preload ignores the scoping" do
+    assert_equal(
+      Comment.find(1).post,
+      Post.where('1 = 0').scoping { Comment.preload(:post).find(1).post }
+    )
+  end
 end