Ensure association preloading properly merges default scope and association conditions

Conflicts:

	activerecord/test/models/reader.rb

activerecord/lib/active_record/associations/preloader/association.rb

@@ -117,9 +117,7 @@ module ActiveRecord
             conditions = klass.send(:instance_eval, &conditions)
           end
 
-          if conditions
-            klass.send(:sanitize_sql, conditions)
-          end
+          conditions
         end
       end
     end

activerecord/test/cases/associations/eager_test.rb

@@ -1010,6 +1010,18 @@ class EagerAssociationTest < ActiveRecord::TestCase
     end
   end
 
+  def test_preload_has_many_with_association_condition_and_default_scope
+    post = Post.create!(:title => 'Beaches', :body => "I like beaches!")
+    Reader.create! :person => people(:david), :post => post
+    LazyReader.create! :person => people(:susan), :post => post
+
+    assert_equal 1, post.lazy_readers.to_a.size
+    assert_equal 2, post.lazy_readers_skimmers_or_not.to_a.size
+
+    post_with_readers = Post.includes(:lazy_readers_skimmers_or_not).find(post.id)
+    assert_equal 2, post_with_readers.lazy_readers_skimmers_or_not.to_a.size
+  end
+
   def test_include_has_many_using_primary_key
     expected = Firm.find(1).clients_using_primary_key.sort_by(&:name)
     # Oracle adapter truncates alias to 30 characters

activerecord/test/models/post.rb

@@ -117,6 +117,7 @@ class Post < ActiveRecord::Base
   has_many :readers
   has_many :secure_readers
   has_many :readers_with_person, :include => :person, :class_name => "Reader"
+
   has_many :people, :through => :readers
   has_many :secure_people, :through => :secure_readers
   has_many :single_people, :through => :readers
@@ -128,6 +129,9 @@ class Post < ActiveRecord::Base
   has_many :skimmers, :class_name => 'Reader', :conditions => { :skimmer => true }
   has_many :impatient_people, :through => :skimmers, :source => :person
 
+  has_many :lazy_readers
+  has_many :lazy_readers_skimmers_or_not, :conditions => { :skimmer => [ true, false ] }, :class_name => 'LazyReader'
+
   def self.top(limit)
     ranked_by_comments.limit_by(limit)
   end

activerecord/test/models/reader.rb

@@ -12,3 +12,11 @@ class SecureReader < ActiveRecord::Base
 
   attr_accessible nil
 end
+
+class LazyReader < ActiveRecord::Base
+  self.table_name = 'readers'
+  default_scope where(:skimmer => true)
+
+  belongs_to :post
+  belongs_to :person
+end