Allow has_many :through to work with :include [Michael Schoen]. Closes #3611

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3566 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Allow :include to be used with has_many :through associations #3611 [Michael Schoen]
+
 * PostgreSQL: smarter schema dumps using pk_and_sequence_for(table).  #2920 [Blair Zajac]
 
 * SQLServer: more compatible limit/offset emulation.  #3779 [Tom Ward]

activerecord/lib/active_record/associations.rb

@@ -1028,7 +1028,7 @@ def construct_counter_sql_with_included_associations(options, reflections)
         end
 
         def construct_finder_sql_with_included_associations(options, schema_abbreviations, reflections)
-          sql = "SELECT #{column_aliases(schema_abbreviations)} FROM #{table_name} "
+          sql = "SELECT #{column_aliases(schema_abbreviations)} FROM #{options[:from] || table_name} "
           sql << reflections.collect { |reflection| association_join(reflection) }.to_s
           sql << "#{options[:joins]} " if options[:joins]
  

activerecord/lib/active_record/associations/has_many_through_association.rb

@@ -80,7 +80,7 @@ def construct_conditions
         end
 
         def construct_from
-          "#{@reflection.table_name}, #{@owner.class.reflections[@reflection.options[:through]].table_name}"
+          "#{@owner.class.reflections[@reflection.options[:through]].table_name}, #{@reflection.table_name}"
         end
         
         def construct_select

activerecord/test/associations_go_eager_test.rb

@@ -4,10 +4,12 @@
 require 'fixtures/author'
 require 'fixtures/category'
 require 'fixtures/company'
+require 'fixtures/person'
+require 'fixtures/reader'
 
 class EagerAssociationTest < Test::Unit::TestCase
   fixtures :posts, :comments, :authors, :categories, :categories_posts,
-            :companies, :accounts
+            :companies, :accounts, :tags, :people, :readers
 
   def test_loading_with_one_association
     posts = Post.find(:all, :include => :comments)
@@ -101,6 +103,15 @@ def test_eager_association_loading_with_belongs_to_and_limit_and_offset_and_mult
     assert_equal [], posts
   end
   
+  def test_eager_with_has_many_through
+    posts_with_comments = people(:michael).posts.find(:all, :include => :comments )
+    posts_with_author = people(:michael).posts.find(:all, :include => :author )
+    posts_with_comments_and_author = people(:michael).posts.find(:all, :include => [ :comments, :author ])
+    assert_equal 2, posts_with_comments.inject(0) { |sum, post| sum += post.comments.size }
+    assert_equal authors(:david), posts_with_author.first.author
+    assert_equal authors(:david), posts_with_comments_and_author.first.author
+  end
+
   def test_eager_with_has_many_and_limit
     posts = Post.find(:all, :order => 'posts.id asc', :include => [ :author, :comments ], :limit => 2)
     assert_equal 2, posts.size

activerecord/test/fixtures/db_definitions/db2.sql

@@ -130,6 +130,13 @@ CREATE TABLE people (
   PRIMARY KEY (id)
 );
 
+CREATE TABLE readers (
+  id INT GENERATED BY DEFAULT AS IDENTITY (START WITH 10000),
+  post_id INT NOT NULL,
+  person_id INT NOT NULL,
+  PRIMARY KEY (id)
+);
+
 CREATE TABLE binaries (
   id INT GENERATED BY DEFAULT AS IDENTITY (START WITH 10000),
   data BLOB(50000),

activerecord/test/fixtures/db_definitions/firebird.sql

@@ -161,6 +161,15 @@ CREATE TABLE people (
 CREATE GENERATOR people_seq;
 SET GENERATOR people_seq TO 10000;
 
+CREATE TABLE readers (
+    id BIGINT NOT NULL,
+    post_id BIGINT NOT NULL,
+    person_id BIGINT NOT NULL,
+    PRIMARY KEY (id)
+);
+CREATE GENERATOR readers_seq;
+SET GENERATOR readers_seq TO 10000;
+
 CREATE TABLE binaries (
   id BIGINT NOT NULL,
   data BLOB,

activerecord/test/fixtures/db_definitions/mysql.sql

@@ -130,6 +130,12 @@ CREATE TABLE `people` (
   `lock_version` INTEGER NOT NULL DEFAULT 0
 ) TYPE=InnoDB;
 
+CREATE TABLE `readers` (
+    `id` int(11) NOT NULL PRIMARY KEY,
+    `post_id` INTEGER NOT NULL,
+    `person_id` INTEGER NOT NULL
+) TYPE=InnoDB;
+
 CREATE TABLE `binaries` (
   `id` int(11) NOT NULL auto_increment,
   `data` mediumblob,

activerecord/test/fixtures/db_definitions/oci.sql

@@ -187,6 +187,14 @@ create table people (
 );
 create sequence people_seq minvalue 10000;
 
+create table readers (
+    id integer not null,
+    post_id integer not null,
+    person_id integer not null,
+    primary key (id)
+);
+create sequence readers_seq minvalue 10000;
+
 create table binaries (
     id integer not null,
     data blob null,

activerecord/test/fixtures/db_definitions/postgresql.sql

@@ -153,6 +153,13 @@ CREATE TABLE people (
   PRIMARY KEY  (id)
 );
 
+CREATE TABLE readers (
+    id serial,
+    post_id integer NOT NULL,
+    person_id integer NOT NULL,
+    primary key (id)
+);
+
 CREATE TABLE binaries ( 
   id serial , 
   data bytea,

activerecord/test/fixtures/db_definitions/sqlite.sql

@@ -118,6 +118,12 @@ CREATE TABLE 'people' (
   'lock_version' INTEGER NOT NULL DEFAULT 0
 );
 
+CREATE TABLE 'readers' (
+    'id' INTEGER NOT NULL PRIMARY KEY,
+    'post_id' INTEGER NOT NULL,
+    'person_id' INTEGER NOT NULL
+);
+
 CREATE TABLE 'binaries' (
   'id' INTEGER NOT NULL PRIMARY KEY,
   'data' BLOB DEFAULT NULL

activerecord/test/fixtures/db_definitions/sqlserver.sql

@@ -118,6 +118,13 @@ CREATE TABLE people (
   PRIMARY KEY (id)
 );
 
+CREATE TABLE readers (
+    id int NOT NULL IDENTITY(1, 1),
+    post_id int NOT NULL,
+    person_id int NOT NULL,
+    primary key (id)
+);
+
 CREATE TABLE binaries (
   id int NOT NULL IDENTITY(1, 1) PRIMARY KEY,
   data image NULL

activerecord/test/fixtures/person.rb

-class Person < ActiveRecord::Base; end
+class Person < ActiveRecord::Base
+  has_many :readers
+  has_many :posts, :through => :readers
+end

activerecord/test/fixtures/post.rb

@@ -28,6 +28,9 @@ def find_most_recent
   has_many :categorizations, :foreign_key => :category_id
   has_many :authors, :through => :categorizations
 
+  has_many :readers
+  has_many :people, :through => :readers
+
   def self.what_are_you
     'a post...'
   end