Rails Lighthouse ticket #1683

has-many-counter-cache.diff

From 8b8991ed2abe5fc6ad2470be13994d1982d3e43c Mon Sep 17 00:00:00 2001
From: Adam Cooper <adam.cooper@gmail.com>
Date: Mon, 29 Dec 2008 22:27:38 -0800
Subject: [PATCH] Adding a :counter_cache attribute to the has_many association to use custom cache column

---
 activerecord/lib/active_record/associations.rb     |   10 +++++++---
 .../associations/has_many_association.rb           |    2 +-
 .../associations/has_many_through_association.rb   |    2 +-
 .../associations/belongs_to_associations_test.rb   |   14 ++++++++++++++
 .../test/cases/associations/join_model_test.rb     |   15 +++++++++++++++
 activerecord/test/cases/base_test.rb               |    2 +-
 activerecord/test/cases/reflection_test.rb         |    6 +++---
 activerecord/test/fixtures/taggings.yml            |    5 +++++
 activerecord/test/models/author.rb                 |    1 +
 activerecord/test/models/post.rb                   |    2 ++
 activerecord/test/models/reply.rb                  |    5 +++++
 activerecord/test/models/tagging.rb                |    4 ++++
 activerecord/test/schema/schema.rb                 |   14 ++++++++++----
 13 files changed, 69 insertions(+), 13 deletions(-)

diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index 86616ab..b4760ae 100755
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -752,6 +752,9 @@ module ActiveRecord
       #   If true, all the associated objects are readonly through the association.
       # [:validate]
       #   If false, don't validate the associated objects when saving the parent object. true by default.
+      # [:counter_cache]
+      #   Specifies the name of a custom counter cache column.  Defaults to <tt>#{association_name}_count</tt> if omitted.
+      #   Note: This does not setup the counter cache and requires a corresponding <tt>belongs_to</tt> with the <tt>:counter_cache</tt>.
       # Option examples:
       #   has_many :comments, :order => "posted_on"
       #   has_many :comments, :include => :author
@@ -968,6 +971,7 @@ module ActiveRecord
       #   destroyed. This requires that a column named <tt>#{table_name}_count</tt> (such as +comments_count+ for a belonging Comment class)
       #   is used on the associate class (such as a Post class). You can also specify a custom counter cache column by providing
       #   a column name instead of a +true+/+false+ value to this option (e.g., <tt>:counter_cache => :my_custom_counter</tt>.)
+      #   If a custom counter cache column is specified then the corresponding <tt>has_many</tt> association may require updating. (See <tt>has_many :counter_cache</tt> options)
       #   Note: Specifying a counter cache will add it to that model's list of readonly attributes using +attr_readonly+.
       # [:include]
       #   Specify second-order associations that should be eager loaded when this object is loaded.
@@ -1555,7 +1559,7 @@ module ActiveRecord
 
         mattr_accessor :valid_keys_for_has_many_association
         @@valid_keys_for_has_many_association = [
-          :class_name, :table_name, :foreign_key, :primary_key,
+          :class_name, :table_name, :foreign_key, :primary_key, :counter_cache,
           :dependent,
           :select, :conditions, :include, :order, :group, :having, :limit, :offset,
           :as, :through, :source, :source_type,
@@ -1576,7 +1580,7 @@ module ActiveRecord
         mattr_accessor :valid_keys_for_has_one_association
         @@valid_keys_for_has_one_association = [
           :class_name, :foreign_key, :remote, :select, :conditions, :order,
-          :include, :dependent, :counter_cache, :extend, :as, :readonly,
+          :include, :dependent, :extend, :as, :readonly,
           :validate, :primary_key
         ]
 
@@ -1587,7 +1591,7 @@ module ActiveRecord
 
         def create_has_one_through_reflection(association_id, options)
           options.assert_valid_keys(
-            :class_name, :foreign_key, :remote, :select, :conditions, :order, :include, :dependent, :counter_cache, :extend, :as, :through, :source, :source_type, :validate
+            :class_name, :foreign_key, :remote, :select, :conditions, :order, :include, :dependent, :extend, :as, :through, :source, :source_type, :validate
           )
           create_reflection(:has_one, association_id, options, self)
         end
diff --git a/activerecord/lib/active_record/associations/has_many_association.rb b/activerecord/lib/active_record/associations/has_many_association.rb
index 3348079..8c16fcb 100644
--- a/activerecord/lib/active_record/associations/has_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_association.rb
@@ -53,7 +53,7 @@ module ActiveRecord
         end
 
         def cached_counter_attribute_name
-          "#{@reflection.name}_count"
+          @reflection.counter_cache_column || "#{@reflection.name}_count"
         end
 
         def insert_record(record)
diff --git a/activerecord/lib/active_record/associations/has_many_through_association.rb b/activerecord/lib/active_record/associations/has_many_through_association.rb
index 2eeeb28..8d76284 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -249,7 +249,7 @@ module ActiveRecord
         end
 
         def cached_counter_attribute_name
-          "#{@reflection.name}_count"
+          @reflection.counter_cache_column || "#{@reflection.name}_count"
         end
     end
   end
diff --git a/activerecord/test/cases/associations/belongs_to_associations_test.rb b/activerecord/test/cases/associations/belongs_to_associations_test.rb
index 40a8503..4bac86e 100644
--- a/activerecord/test/cases/associations/belongs_to_associations_test.rb
+++ b/activerecord/test/cases/associations/belongs_to_associations_test.rb
@@ -273,6 +273,20 @@ class BelongsToAssociationsTest < ActiveRecord::TestCase
     reply[:replies_count] = 17
     assert_equal 17, reply.replies.size
   end
+  
+  def test_custom_counter_cache_with_non_default_name
+    reply = Reply.create(:title => "re: zoom", :content => "speedy quick!")
+    assert_equal 0, reply[:custom_count]
+
+    custom = CustomReply.create(:title => "gaga", :content => "boo-boo")
+    custom.reply = reply
+
+    assert_equal 1, reply.reload[:custom_count]
+    assert_equal 1, reply.custom_replies.size
+
+    reply[:custom_count] = 17
+    assert_equal 17, reply.custom_replies.size
+  end
 
   def test_store_two_association_with_one_save
     num_orders = Order.count
diff --git a/activerecord/test/cases/associations/join_model_test.rb b/activerecord/test/cases/associations/join_model_test.rb
index 7a0427a..9c9fa66 100644
--- a/activerecord/test/cases/associations/join_model_test.rb
+++ b/activerecord/test/cases/associations/join_model_test.rb
@@ -323,6 +323,13 @@ class AssociationsJoinModelTest < ActiveRecord::TestCase
     tagging.destroy
     assert posts(:welcome, :reload)[:taggings_count].zero?
   end
+  def test_belongs_to_polymorphic_with_custom_counter_cache
+    assert_equal 0, posts(:welcome)[:custom_count]
+    tagging = posts(:welcome).custom_taggings.create(:tag => tags(:general))
+    assert_equal 1, posts(:welcome, :reload)[:custom_count]
+    tagging.destroy
+    assert posts(:welcome, :reload)[:custom_count].zero?
+  end
 
   def test_unavailable_through_reflection
     assert_raise(ActiveRecord::HasManyThroughAssociationNotFoundError) { authors(:david).nothings }
@@ -518,6 +525,14 @@ class AssociationsJoinModelTest < ActiveRecord::TestCase
       assert !author.comments.loaded?
     end
   end
+  uses_mocha('has_many_through_collection_size_uses_custom_counter_cache') do
+    def test_has_many_through_collection_size_uses_custom_counter_cache
+      author = authors(:david)
+      author.stubs(:read_attribute).with('custom_count').returns(100)
+      assert_equal 100, author.custom_comments.size
+      assert !author.custom_comments.loaded?
+    end
+  end
 
   def test_adding_junk_to_has_many_through_should_raise_type_mismatch
     assert_raise(ActiveRecord::AssociationTypeMismatch) { posts(:thinking).tags << "Uhh what now?" }
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 0f03dae..8139ff3 100755
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1995,7 +1995,7 @@ class BasicsTest < ActiveRecord::TestCase
 
   def test_inspect_instance
     topic = topics(:first)
-    assert_equal %(#<Topic id: 1, title: "The First Topic", author_name: "David", author_email_address: "david@loudthinking.com", written_on: "#{topic.written_on.to_s(:db)}", bonus_time: "#{topic.bonus_time.to_s(:db)}", last_read: "#{topic.last_read.to_s(:db)}", content: "Have a nice day", approved: false, replies_count: 1, parent_id: nil, type: nil>), topic.inspect
+    assert_equal %(#<Topic id: 1, title: "The First Topic", author_name: "David", author_email_address: "david@loudthinking.com", written_on: "#{topic.written_on.to_s(:db)}", bonus_time: "#{topic.bonus_time.to_s(:db)}", last_read: "#{topic.last_read.to_s(:db)}", content: "Have a nice day", approved: false, replies_count: 1, custom_count: 0, parent_id: nil, type: nil>), topic.inspect
   end
 
   def test_inspect_new_instance
diff --git a/activerecord/test/cases/reflection_test.rb b/activerecord/test/cases/reflection_test.rb
index e0ed3e5..2aaf537 100644
--- a/activerecord/test/cases/reflection_test.rb
+++ b/activerecord/test/cases/reflection_test.rb
@@ -20,18 +20,18 @@ class ReflectionTest < ActiveRecord::TestCase
 
   def test_read_attribute_names
     assert_equal(
-      %w( id title author_name author_email_address bonus_time written_on last_read content approved replies_count parent_id type ).sort,
+      %w( id title author_name author_email_address bonus_time written_on last_read content approved replies_count custom_count parent_id type ).sort,
       @first.attribute_names
     )
   end
 
   def test_columns
-    assert_equal 12, Topic.columns.length
+    assert_equal 13, Topic.columns.length
   end
 
   def test_columns_are_returned_in_the_order_they_were_declared
     column_names = Topic.columns.map { |column| column.name }
-    assert_equal %w(id title author_name author_email_address written_on bonus_time last_read content approved replies_count parent_id type), column_names
+    assert_equal %w(id title author_name author_email_address written_on bonus_time last_read content approved replies_count custom_count parent_id type), column_names
   end
 
   def test_content_columns
diff --git a/activerecord/test/fixtures/taggings.yml b/activerecord/test/fixtures/taggings.yml
index 1e3d596..5ed79c5 100644
--- a/activerecord/test/fixtures/taggings.yml
+++ b/activerecord/test/fixtures/taggings.yml
@@ -1,5 +1,6 @@
 welcome_general:
   id: 1
+  type: Tagging
   tag_id: 1
   super_tag_id: 2
   taggable_id: 1
@@ -7,22 +8,26 @@ welcome_general:
 
 thinking_general:
   id: 2
+  type: Tagging
   tag_id: 1
   taggable_id: 2
   taggable_type: Post
 
 fake: 
   id: 3
+  type: Tagging
   tag_id: 1
   taggable_id: 1
   taggable_type: FakeModel
 
 godfather:
   id: 4
+  type: Tagging
   tag_id: 1
   taggable_id: 1
   taggable_type: Item
 
 orphaned:
   id: 5
+  type: Tagging
   tag_id: 1
diff --git a/activerecord/test/models/author.rb b/activerecord/test/models/author.rb
index 4ffac4f..45bcb3f 100644
--- a/activerecord/test/models/author.rb
+++ b/activerecord/test/models/author.rb
@@ -24,6 +24,7 @@ class Author < ActiveRecord::Base
   has_many :comments_containing_the_letter_e, :through => :posts, :source => :comments
   has_many :comments_with_order_and_conditions, :through => :posts, :source => :comments, :order => 'comments.body', :conditions => "comments.body like 'Thank%'"
   has_many :comments_with_include, :through => :posts, :source => :comments, :include => :post
+  has_many :custom_comments, :through => :posts, :source => :comments, :counter_cache => 'custom_count'
 
 
   has_many :comments_desc, :through => :posts, :source => :comments, :order => 'comments.id DESC'
diff --git a/activerecord/test/models/post.rb b/activerecord/test/models/post.rb
index e0d8be6..50d2aac 100644
--- a/activerecord/test/models/post.rb
+++ b/activerecord/test/models/post.rb
@@ -43,6 +43,8 @@ class Post < ActiveRecord::Base
         :joins => 'left outer join posts on taggings.taggable_id = posts.id left outer join authors on posts.author_id = authors.id'
     end
   end
+  has_many :custom_taggings, :as => :custom_taggable
+  has_many :custom_tags, :through => :custom_taggings, :source => :tag
 
   has_many :funky_tags, :through => :taggings, :source => :tag
   has_many :super_tags, :through => :taggings
diff --git a/activerecord/test/models/reply.rb b/activerecord/test/models/reply.rb
index 812bc1f..31748ba 100644
--- a/activerecord/test/models/reply.rb
+++ b/activerecord/test/models/reply.rb
@@ -5,6 +5,7 @@ class Reply < Topic
 
   belongs_to :topic, :foreign_key => "parent_id", :counter_cache => true
   has_many :replies, :class_name => "SillyReply", :dependent => :destroy, :foreign_key => "parent_id"
+  has_many :custom_replies, :class_name => "CustomReply", :dependent => :destroy, :foreign_key => "parent_id", :counter_cache => 'custom_count'
 
   validate :errors_on_empty_content
   validate_on_create :title_is_wrong_create
@@ -37,3 +38,7 @@ end
 class SillyReply < Reply
   belongs_to :reply, :foreign_key => "parent_id", :counter_cache => :replies_count
 end
+
+class CustomReply < Reply
+  belongs_to :reply, :foreign_key => "parent_id", :counter_cache => :custom_count
+end
\ No newline at end of file
diff --git a/activerecord/test/models/tagging.rb b/activerecord/test/models/tagging.rb
index a1fa1a9..99a5789 100644
--- a/activerecord/test/models/tagging.rb
+++ b/activerecord/test/models/tagging.rb
@@ -7,4 +7,8 @@ class Tagging < ActiveRecord::Base
   belongs_to :super_tag,   :class_name => 'Tag', :foreign_key => 'super_tag_id'
   belongs_to :invalid_tag, :class_name => 'Tag', :foreign_key => 'tag_id'
   belongs_to :taggable, :polymorphic => true, :counter_cache => true
+end
+
+class CustomTagging < Tagging
+  belongs_to :custom_taggable, :polymorphic => true, :counter_cache => 'custom_count'
 end
\ No newline at end of file
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 8199cb8..b268227 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -94,6 +94,7 @@ ActiveRecord::Schema.define do
   end
 
   create_table :comments, :force => true do |t|
+    t.string  :type
     t.integer :post_id, :null => false
     t.text    :body, :null => false
     t.string  :type
@@ -323,6 +324,7 @@ ActiveRecord::Schema.define do
     t.string  :type
     t.integer :comments_count, :default => 0
     t.integer :taggings_count, :default => 0
+    t.integer :custom_count, :default => 0
   end
 
   create_table :price_estimates, :force => true do |t|
@@ -388,15 +390,19 @@ ActiveRecord::Schema.define do
     t.text     :content
     t.boolean  :approved, :default => true
     t.integer  :replies_count, :default => 0
+    t.integer  :custom_count, :default => 0
     t.integer  :parent_id
     t.string   :type
   end
 
   create_table :taggings, :force => true do |t|
-    t.column :tag_id, :integer
-    t.column :super_tag_id, :integer
-    t.column :taggable_type, :string
-    t.column :taggable_id, :integer
+    t.string  :type
+    t.integer :tag_id
+    t.integer :super_tag_id
+    t.string :taggable_type
+    t.integer :taggable_id
+    t.string :custom_taggable_type
+    t.integer :custom_taggable_id
   end
 
   create_table :tags, :force => true do |t|
-- 
1.5.6.2