Make sure with_scope takes both :select and :joins into account when setting :readonly. Allows you to save records you retrieve using finders on a has_many :through associations. [Koz]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6413 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Make sure with_scope takes both :select and :joins into account when setting :readonly.  Allows you to save records you retrieve using method_missing on a has_many :through associations.  [Koz]
+
 * Allow a polymorphic :source for has_many :through associations.  Closes #7143 [protocool]
 
 * Consistent public/protected/private visibility for chained methods.  #7813 [Dan Manges]

activerecord/lib/active_record/base.rb

@@ -938,7 +938,7 @@ module ActiveRecord #:nodoc:
 
         if f = method_scoping[:find]
           f.assert_valid_keys([ :conditions, :joins, :select, :include, :from, :offset, :limit, :order, :readonly, :lock ])
-          f[:readonly] = true if !f[:joins].blank? && !f.has_key?(:readonly)
+          set_readonly_option! f
         end
 
         # Merge scopings

activerecord/test/associations_test.rb

@@ -10,6 +10,8 @@ require 'fixtures/order'
 require 'fixtures/category'
 require 'fixtures/post'
 require 'fixtures/author'
+require 'fixtures/tag'
+require 'fixtures/tagging'
 
 
 class AssociationsTest < Test::Unit::TestCase
@@ -1855,4 +1857,12 @@ class HasAndBelongsToManyAssociationsTest < Test::Unit::TestCase
     projects  = Project.send(:select_limited_ids_list, {:order => 'developers.created_at'}, join_dep)
     assert_equal %w(1 2), projects.scan(/\d/).sort
   end
+  
+  def test_scoped_find_on_through_association_doesnt_return_read_only_records
+    tag = Post.find(1).tags.find_by_name("General")
+    
+    assert_nothing_raised do
+      tag.save!
+    end
+  end
 end