3 files changed, 47 insertions, 0 deletions
diff --git a/activerecord/test/cases/finder_test.rb b/activerecord/test/cases/finder_test.rb
index 10f6aa0f2a..292b88edbc 100644
--- a/activerecord/test/cases/finder_test.rb
+++ b/activerecord/test/cases/finder_test.rb
@@ -935,6 +935,17 @@ class FinderTest < ActiveRecord::TestCase
     assert_equal 1, first.id
   end
 
+  def test_joins_with_string_array
+    person_with_reader_and_post = Post.find(
+      :all,
+      :joins => [
+        "INNER JOIN categorizations ON categorizations.post_id = posts.id",
+        "INNER JOIN categories ON categories.id = categorizations.category_id AND categories.type = 'SpecialCategory'"
+      ]
+    )
+    assert_equal 1, person_with_reader_and_post.size
+  end
+
   def test_find_by_id_with_conditions_with_or
     assert_nothing_raised do
       Post.find([1,2,3],
diff --git a/activerecord/test/cases/method_scoping_test.rb b/activerecord/test/cases/method_scoping_test.rb
index af6fcd32ad..ff10bfaf3e 100644
--- a/activerecord/test/cases/method_scoping_test.rb
+++ b/activerecord/test/cases/method_scoping_test.rb
@@ -138,6 +138,36 @@ class MethodScopingTest < ActiveRecord::TestCase
     assert_equal authors(:david).attributes, scoped_authors.first.attributes
   end
 
+  def test_scoped_find_merges_string_array_style_and_string_style_joins
+    scoped_authors = Author.with_scope(:find => { :joins => ["INNER JOIN posts ON posts.author_id = authors.id"]}) do
+      Author.find(:all, :select => 'DISTINCT authors.*', :joins => 'INNER JOIN comments ON posts.id = comments.post_id', :conditions => 'comments.id = 1')
+    end
+    assert scoped_authors.include?(authors(:david))
+    assert !scoped_authors.include?(authors(:mary))
+    assert_equal 1, scoped_authors.size
+    assert_equal authors(:david).attributes, scoped_authors.first.attributes
+  end
+
+  def test_scoped_find_merges_string_array_style_and_hash_style_joins
+    scoped_authors = Author.with_scope(:find => { :joins => :posts}) do
+      Author.find(:all, :select => 'DISTINCT authors.*', :joins => ['INNER JOIN comments ON posts.id = comments.post_id'], :conditions => 'comments.id = 1')
+    end
+    assert scoped_authors.include?(authors(:david))
+    assert !scoped_authors.include?(authors(:mary))
+    assert_equal 1, scoped_authors.size
+    assert_equal authors(:david).attributes, scoped_authors.first.attributes
+  end
+
+  def test_scoped_find_merges_joins_and_eliminates_duplicate_string_joins
+    scoped_authors = Author.with_scope(:find => { :joins => 'INNER JOIN posts ON posts.author_id = authors.id'}) do
+      Author.find(:all, :select => 'DISTINCT authors.*', :joins => ["INNER JOIN posts ON posts.author_id = authors.id", "INNER JOIN comments ON posts.id = comments.post_id"], :conditions => 'comments.id = 1')
+    end
+    assert scoped_authors.include?(authors(:david))
+    assert !scoped_authors.include?(authors(:mary))
+    assert_equal 1, scoped_authors.size
+    assert_equal authors(:david).attributes, scoped_authors.first.attributes
+  end
+
   def test_scoped_count_include
     # with the include, will retrieve only developers for the given project
     Developer.with_scope(:find => { :include => :projects }) do
diff --git a/activerecord/test/cases/named_scope_test.rb b/activerecord/test/cases/named_scope_test.rb
index 444debd255..64e899780c 100644
--- a/activerecord/test/cases/named_scope_test.rb
+++ b/activerecord/test/cases/named_scope_test.rb
@@ -271,4 +271,10 @@ class NamedScopeTest < ActiveRecord::TestCase
       topics.size # use loaded (no query)
     end
   end
+
+  def test_chaining_with_duplicate_joins
+    join = "INNER JOIN comments ON comments.post_id = posts.id"
+    post = Post.find(1)
+    assert_equal post.comments.size, Post.scoped(:joins => join).scoped(:joins => join, :conditions => "posts.id = #{post.id}").size
+  end
 end