RSpec、Rails 4、Postgres、UUID 主键 : id is null with Rake + RSpec, 但在 RSpec 或控制台中很好

Question

我正在尝试使用 UUID 主键启动并运行带有 Postgres 和 Rails 4.0.0.rc2 的模型，但我的规范无法创建和销毁，但 MyThing.create或 MyThing#destroy在 rails 控制台上工作正常(在开发和测试环境中)。 ...直到我运行规范，在这种情况下，通过控制台执行其中任何一项操作都会停止工作。因此，当我运行更改我的数据库并禁止 UUID 键继续工作的规范时，看起来会发生一些事情。

哈？

我关注了 this blog post生成我的迁移，因此我的架构如下所示:

ActiveRecord::Schema.define(version: 20130613174601) do
  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"
  enable_extension "uuid-ossp"

  create_table "growers", id: false, force: true do |t|
    t.uuid     "id",         null: false
    t.string   "name"
    t.string   "code"
    t.datetime "created_at"
    t.datetime "updated_at"
  end
end

下面是事情的进展:

创建: $ rake db:create RAILS_ENV=test
迁移:

$ rake db:migrate RAILS_ENV=test
==  CreateGrowers: migrating ==================================================
-- enable_extension("uuid-ossp")
   -> 0.0052s
-- create_table(:growers, {:id=>:uuid})
   -> 0.0043s
==  CreateGrowers: migrated (0.0096s) =========================================

创建模型对象:

$ rails c test
agrian> g = Grower.create name: 'bobo'
   (0.3ms)  BEGIN
  SQL (4.1ms)  INSERT INTO "growers" ("created_at", "name", "updated_at") VALUES ($1, $2, $3) RETURNING "id"  [["created_at", Tue, 18 Jun 2013 20:22:39 UTC +00:00], ["name", "bobo"], ["updated_at", Tue, 18 Jun 2013 20:22:39 UTC +00:00]]
   (0.4ms)  COMMIT
=> #<Grower id: "38f84f39-e52e-4664-b776-4fdfcbd60b09", name: "bobo", code: nil, created_at: "2013-06-18 20:22:39", updated_at: "2013-06-18 20:22:39">

(欣喜若狂)

运行规范:

$ rake spec
/Users/sloveless/.rbenv/versions/2.0.0-p195/bin/ruby -S rspec ./spec/controllers/api/v1/growers_controller_spec.rb ./spec/helpers/growers_helper_spec.rb ./spec/models/grower_spec.rb ./spec/requests/api/v1/growers_spec.rb ./spec/routing/api/v1/growers_routing_spec.rb
...............FF..........F.*
(other stuff)
Finished in 0.30626 seconds
30 examples, 3 failures, 1 pending

创建模型对象:

$ rails c test
Loading test environment (Rails 4.0.0.rc2)
agrian> g = Grower.create name: 'bobo'
   (0.4ms)  BEGIN
  SQL (3.5ms)  INSERT INTO "growers" ("created_at", "name", "updated_at") VALUES ($1, $2, $3)  [["created_at", Tue, 18 Jun 2013 20:29:36 UTC +00:00], ["name", "bobo"], ["updated_at", Tue, 18 Jun 2013 20:29:36 UTC +00:00]]
PG::Error: ERROR:  null value in column "id" violates not-null constraint
DETAIL:  Failing row contains (null, bobo, null, 2013-06-18 20:29:36.773391, 2013-06-18 20:29:36.773391).
: INSERT INTO "growers" ("created_at", "name", "updated_at") VALUES ($1, $2, $3)
   (0.2ms)  ROLLBACK
ActiveRecord::StatementInvalid: PG::Error: ERROR:  null value in column "id" violates not-null constraint
DETAIL:  Failing row contains (null, bobo, null, 2013-06-18 20:29:36.773391, 2013-06-18 20:29:36.773391).
: INSERT INTO "growers" ("created_at", "name", "updated_at") VALUES ($1, $2, $3)
from /Users/sloveless/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:780:in `get_last_result'

(悲伤的脸)

有人可以在这里指出我正确的方向，关于我的数据库可能会做什么愚蠢的事情吗？

更新:我可以跑 bin/rspec spec一次又一次地成功(我所有的规范都通过了)。如果我运行 rake spec ，我失败了，然后下次我运行 bin/rspec spec我失败了。

编辑:更新标题以反射(reflect) rake + rspec 问题，而不仅仅是 rspec。

Answer 1

我看到了 rspec-rails/lib/rspec/rails/tasks/rspec.rake为 spec 定义了这个任务:

spec_prereq = Rails.configuration.generators.options[:rails][:orm] == :active_record ?  "test:prepare" : :noop
task :noop do; end
task :default => :spec

# other stuff

desc "Run all specs in spec directory (excluding plugin specs)"
RSpec::Core::RakeTask.new(:spec => spec_prereq)

...运行:

db:load_config

db:test:purge

db:test:load

db:test:load_schema

db:schema:load

我看到了，运行时 rake db:schema:load ，我得到:

-- enable_extension("plpgsql")
   -> 0.0161s
-- enable_extension("uuid-ossp")
   -> 0.0063s
-- create_table("growers", {:id=>false, :force=>true})
   -> 0.0049s
-- initialize_schema_migrations_table()
   -> 0.0062s

...这与我运行迁移时不同:

==  CreateGrowers: migrating ==================================================
-- enable_extension("uuid-ossp")
   -> 0.0050s
-- create_table(:growers, {:id=>:uuid})
   -> 0.0052s
==  CreateGrowers: migrated (0.0103s) =========================================

因此，在我看来 db:schema:load任务不是使用 UUID 主键创建表，从而导致失败。好像是 Rails 的 bug？？

更新:我想我会找出它是否是 Rails 错误: Issue 11016