Added association preload to relation.

activerecord/lib/active_record/base.rb

@@ -664,11 +664,28 @@ def last(*args)
       # This is an alias for find(:all).  You can pass in all the same arguments to this method as you can
       # to find(:all)
       def all(*args)
-        if args.empty? && !scoped?(:find)
-          arel_table
+        options = args.extract_options!
+
+
+        if options.empty? #&& !scoped?(:find)
+          relation = arel_table
         else
-          construct_finder_arel(*args)
+          include_associations = merge_includes(scope(:find, :include), options[:include])
+
+          # if include_associations.any? && references_eager_loaded_tables?(options)
+          #   join_dependency = JoinDependency.new(self, include_associations, options[:joins])
+
+          #   relation = construct_finder_arel_with_included_associations(options, join_dependency)
+
+          #   relation.preload(include_associations)
+          # else
+            relation = construct_finder_arel(options)
+            if include_associations.any?
+              relation.preload(include_associations)
+            # end
+          end
         end
+        relation
       end
 
       # Executes a custom SQL query against your database and returns all the results.  The results will

activerecord/lib/active_record/relation.rb

@@ -6,6 +6,12 @@ class Relation
     def initialize(klass, relation)
       @klass, @relation = klass, relation
       @readonly = false
+      @associations_to_preload = []
+    end
+
+    def preload(association)
+      @associations_to_preload << association
+      @associations_to_preload.flatten!
     end
 
     def readonly
@@ -16,6 +22,8 @@ def readonly
     def to_a
       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
 
       records

activerecord/test/cases/relations_test.rb

@@ -1,6 +1,7 @@
 require "cases/helper"
 require 'models/post'
 require 'models/topic'
+require 'models/comment'
 require 'models/reply'
 require 'models/author'
 require 'models/entrant'
@@ -8,7 +9,7 @@
 require 'models/company'
 
 class RelationTest < ActiveRecord::TestCase
-  fixtures :authors, :topics, :entrants, :developers, :companies, :developers_projects, :accounts, :categories, :categorizations, :posts
+  fixtures :authors, :topics, :entrants, :developers, :companies, :developers_projects, :accounts, :categories, :categorizations, :posts, :comments
 
   def test_finding_with_conditions
     assert_equal Author.find(:all, :conditions => "name = 'David'"), Author.all.conditions("name = 'David'").to_a
@@ -85,5 +86,33 @@ def test_find_with_readonly_option
     Developer.all.readonly.each { |d| assert d.readonly? }
     Developer.all(:readonly => true).each { |d| assert d.readonly? }
   end
+
+  def test_eager_association_loading_of_stis_with_multiple_references
+    authors = Author.all(:include => { :posts => { :special_comments => { :post => [ :special_comments, :very_special_comment ] } } }, :order => 'comments.body, very_special_comments_posts.body', :conditions => 'posts.id = 4').to_a
+    assert_equal [authors(:david)], authors
+    assert_no_queries do
+      authors.first.posts.first.special_comments.first.post.special_comments
+      authors.first.posts.first.special_comments.first.post.very_special_comment
+    end
+  end
+
+  def test_find_with_included_associations
+    assert_queries(2) do
+      posts = Post.find(:all, :include => :comments)
+      posts.first.comments.first
+    end
+    assert_queries(2) do
+      posts = Post.all(:include => :comments).to_a
+      posts.first.comments.first
+    end
+    assert_queries(2) do
+      posts = Post.find(:all, :include => :author)
+      posts.first.author
+    end
+    assert_queries(2) do
+      posts = Post.all(:include => :author).to_a
+      posts.first.author
+    end
+  end
 end