Last active
August 29, 2015 14:01
-
-
Save faun/60a0ce91401006c33222 to your computer and use it in GitHub Desktop.
Issue with Rails 4.1 has_many uniq through and order
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
require 'rubygems' | |
require 'active_record' | |
require 'logger' | |
ActiveRecord::Base.establish_connection(adapter: 'postgresql', host: 'localhost', database: 'test_database') | |
ActiveRecord::Base.logger = Logger.new(STDOUT) | |
logger = Logger.new(STDOUT) | |
ActiveRecord::Schema.define do | |
create_table "authors", force: true do |t| | |
t.string "name" | |
t.timestamps | |
end | |
create_table "authorships", id: false, force: true do |t| | |
t.integer "author_id", null: false | |
t.integer "zine_id", null: false | |
end | |
add_index "authorships", ["author_id", "zine_id"], name: "index_authorships_on_author_id_and_zine_id", unique: true, using: :btree | |
create_table "zines", force: true do |t| | |
t.string "title", null: false | |
t.boolean "published", default: true | |
t.timestamps | |
end | |
end | |
class Author < ActiveRecord::Base | |
has_many :authorships | |
has_many :zines, through: :authorships | |
scope :published, -> { | |
joins(:zines) | |
.merge(Zine.published) | |
.except(:order) | |
.distinct(Author.arel_table[:id]) | |
.order(name: :desc) | |
} | |
end | |
class Zine < ActiveRecord::Base | |
has_many :authorships | |
has_many(:authors, | |
-> { distinct }, | |
through: :authorships) | |
scope :published, -> { | |
where(published: true) | |
.order(updated_at: :desc) | |
} | |
end | |
class Authorship < ActiveRecord::Base | |
belongs_to :author, | |
validate: true, | |
dependent: :destroy | |
belongs_to :zine, validate: true | |
end | |
zine = Zine.create!(title: "A Guide to Becoming a Superhero", published: true) | |
author_1 = Author.create!(name: 'Alfred') | |
Authorship.create(zine_id: zine.id, author_id: author_1.id) | |
author_2 = Author.create!(name: 'Batman') | |
Authorship.create(zine_id: zine.id, author_id: author_2.id) | |
Author.create!(name: 'Robin') # Unpublished author | |
logger.debug Author.published |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
source 'https://rubygems.org' | |
# gem 'activerecord', '4.0.5' | |
gem 'activerecord', '4.1.1' | |
gem 'pg' |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
GEM | |
remote: https://rubygems.org/ | |
specs: | |
activemodel (4.1.1) | |
activesupport (= 4.1.1) | |
builder (~> 3.1) | |
activerecord (4.1.1) | |
activemodel (= 4.1.1) | |
activesupport (= 4.1.1) | |
arel (~> 5.0.0) | |
activesupport (4.1.1) | |
i18n (~> 0.6, >= 0.6.9) | |
json (~> 1.7, >= 1.7.7) | |
minitest (~> 5.1) | |
thread_safe (~> 0.1) | |
tzinfo (~> 1.1) | |
arel (5.0.1.20140414130214) | |
builder (3.2.2) | |
i18n (0.6.9) | |
json (1.8.1) | |
minitest (5.3.3) | |
pg (0.17.1) | |
thread_safe (0.3.3) | |
tzinfo (1.1.0) | |
thread_safe (~> 0.1) | |
PLATFORMS | |
ruby | |
DEPENDENCIES | |
activerecord (= 4.1.1) | |
pg |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment