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@@ -1,5 +1,7 @@
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 *Edge*
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+* Fix column collision with named_scope and :joins.  #46 [Duncan Beevers, Mark Catley]
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+
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 * db:migrate:down and :up update schema_migrations.  #369 [Michael Raidel, RaceCondition]
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 * PostgreSQL: support :conditions => [':foo::integer', { :foo => 1 }] without treating the ::integer typecast as a bind variable.  [Tarmo Tänav]

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@@ -1479,7 +1479,7 @@ module ActiveRecord #:nodoc:
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         def construct_finder_sql(options)
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           scope = scope(:find)
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-          sql  = "SELECT #{options[:select] || (scope && scope[:select]) || (options[:joins] && quoted_table_name + '.*') || '*'} "
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+          sql  = "SELECT #{options[:select] || (scope && scope[:select]) || ((options[:joins] || (scope && scope[:joins])) && quoted_table_name + '.*') || '*'} "
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           sql << "FROM #{(scope && scope[:from]) || options[:from] || quoted_table_name} "
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           add_joins!(sql, options, scope)

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@@ -87,6 +87,16 @@ class MethodScopingTest < ActiveRecord::TestCase
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     assert_equal 1, scoped_developers.size
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   end
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+  def test_scoped_find_joins
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+    scoped_developers = Developer.with_scope(:find => { :joins => 'JOIN developers_projects ON id = developer_id' } ) do
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+      Developer.find(:all, :conditions => 'developers_projects.project_id = 2')
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+    end
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+    assert scoped_developers.include?(developers(:david))
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+    assert !scoped_developers.include?(developers(:jamis))
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+    assert_equal 1, scoped_developers.size
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+    assert_equal developers(:david).attributes, scoped_developers.first.attributes
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+  end
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+
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   def test_scoped_count_include
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     # with the include, will retrieve only developers for the given project
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     Developer.with_scope(:find => { :include => :projects }) do

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@@ -6,7 +6,7 @@ require 'models/reply'
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 require 'models/author'
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 class NamedScopeTest < ActiveRecord::TestCase
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-  fixtures :posts, :authors, :topics, :comments
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+  fixtures :posts, :authors, :topics, :comments, :author_addresses
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   def test_implements_enumerable
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     assert !Topic.find(:all).empty?
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@@ -83,6 +83,25 @@ class NamedScopeTest < ActiveRecord::TestCase
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     assert_equal topics_written_before_the_second, Topic.written_before(topics(:second).written_on)
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   end
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+  def test_scopes_with_joins
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+    address = author_addresses(:david_address)
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+    posts_with_authors_at_address = Post.find(
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+      :all, :joins => 'JOIN authors ON authors.id = posts.author_id',
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+      :conditions => [ 'authors.author_address_id = ?', address.id ]
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+    )
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+    assert_equal posts_with_authors_at_address, Post.with_authors_at_address(address)
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+  end
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+
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+  def test_scopes_with_joins_respects_custom_select
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+    address = author_addresses(:david_address)
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+    posts_with_authors_at_address_titles = Post.find(:all,
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+      :select => 'title',
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+      :joins => 'JOIN authors ON authors.id = posts.author_id',
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+      :conditions => [ 'authors.author_address_id = ?', address.id ]
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+    )
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+    assert_equal posts_with_authors_at_address_titles, Post.with_authors_at_address(address).find(:all, :select => 'title')
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+  end
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+
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   def test_extensions
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     assert_equal 1, Topic.anonymous_extension.one
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     assert_equal 2, Topic.named_extension.two

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@@ -1,6 +1,11 @@
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 class Post < ActiveRecord::Base
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   named_scope :containing_the_letter_a, :conditions => "body LIKE '%a%'"
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-  
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+  named_scope :with_authors_at_address, lambda { |address| {
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+      :conditions => [ 'authors.author_address_id = ?', address.id ],
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+      :joins => 'JOIN authors ON authors.id = posts.author_id'
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+    }
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+  }
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+
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   belongs_to :author do
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     def greeting
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       "hello"