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has_one through not available on unpersisted instances
# frozen_string_literal: true
begin
require "bundler/inline"
rescue LoadError => e
$stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
raise e
end
gemfile(true) do
source "https://rubygems.org"
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
gem "rails", :git => "git@github.com:/mkessler/rails.git"
gem "sqlite3"
end
require "active_record"
require "minitest/autorun"
require "logger"
# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Schema.define do
create_table :posts, force: true do |t|
t.integer :owner_id
t.string :title
end
create_table :comments, force: true do |t|
t.integer :post_id
end
create_table :owners, force: true do |t|
t.integer :post_id
t.string :name
end
end
class Post < ActiveRecord::Base
belongs_to :owner
has_many :comments
end
class Comment < ActiveRecord::Base
belongs_to :post
has_one :owner, through: :post
end
class Owner < ActiveRecord::Base
end
class BugTest < Minitest::Test
def test_association_stuff
owner = Owner.new(name: "cool_post_owner")
post = Post.new(owner: owner, title: "A cool post")
comment = Comment.new
post.comments << comment
refute_nil comment.post.title
assert_equal post.title, comment.post.title
# passes when not using the has_one through association
assert_equal owner.name, post.comments.first.post.owner.name
# fails when using the has_one through association
assert_equal owner.name, post.comments.first.owner.name
end
end
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