Allow preload and eager_load to work on relations at the same time.

activerecord/lib/active_record/relation.rb

@@ -26,9 +26,9 @@ module ActiveRecord
     end
 
     def to_a
-      if @eager_load_associations.any?
-        records = catch :invalid_query do
-          @klass.send(:find_with_associations, {
+      records = if @eager_load_associations.any?
+        catch :invalid_query do
+          return @klass.send(:find_with_associations, {
             :select => @relation.send(:select_clauses).join(', '),
             :joins => @relation.joins(relation),
             :group => @relation.send(:group_clauses).join(', '),
@@ -38,12 +38,14 @@ module ActiveRecord
             },
             ActiveRecord::Associations::ClassMethods::JoinDependency.new(@klass, @eager_load_associations, nil))
         end
+        []
       else
-        records = @klass.find_by_sql(@relation.to_sql)
-        @klass.send(:preload_associations, records, @associations_to_preload) unless @associations_to_preload.empty?
-        records.each { |record| record.readonly! } if @readonly
+        @klass.find_by_sql(@relation.to_sql)
       end
 
+      @klass.send(:preload_associations, records, @associations_to_preload) unless @associations_to_preload.empty?
+      records.each { |record| record.readonly! } if @readonly
+
       records
     end
 

activerecord/test/cases/relations_test.rb

@@ -4,6 +4,7 @@ require 'models/topic'
 require 'models/comment'
 require 'models/reply'
 require 'models/author'
+require 'models/comment'
 require 'models/entrant'
 require 'models/developer'
 require 'models/company'
@@ -125,5 +126,26 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal 'Jamis', DeveloperCalledJamis.create!.name
   end
 
+    def test_loading_with_one_association
+    posts = Post.all(:include => :comments).to_a
+    post = posts.find { |p| p.id == 1 }
+    assert_equal 2, post.comments.size
+    assert post.comments.include?(comments(:greetings))
+
+    post = Post.find(:first, :include => :comments, :conditions => "posts.title = 'Welcome to the weblog'")
+    assert_equal 2, post.comments.size
+    assert post.comments.include?(comments(:greetings))
+
+    posts = Post.all(:include => :last_comment).to_a
+    post = posts.find { |p| p.id == 1 }
+    assert_equal Post.find(1).last_comment, post.last_comment
+  end
+
+  def test_loading_with_one_association_with_non_preload
+    posts = Post.all(:include => :last_comment, :order => 'comments.id DESC').to_a
+    post = posts.find { |p| p.id == 1 }
+    assert_equal Post.find(1).last_comment, post.last_comment
+  end
+
 end