Question

刚刚从sqlite切换到pg。我注意到，虽然测试表清除得很好，但ID不会重新启动到1.换句话说，给定测试：

describe "" do
  before do
    # some dummy is created
    Object.create()
    puts "count = #{Object.count}"
    puts "last object_id = #{Object.id}"
  end
  ...
end

如果你进行了很多测试，你将获得以下输出：

count = 1
last object_id = 1
count = 1
last object_id = 2
count = 1
last object_id = 3
count = 1
last object_id = 4

虽然我觉得清除测试表并重新启动ID以便更好：

count = 1
last object_id = 1
count = 1
last object_id = 1
count = 1
last object_id = 1
count = 1
last object_id = 1

我认为这只是我spec_helper文件中需要的内容？作为参考，下面是当前的帮助文件，我使用database_cleaner gem。谢谢！

RSpec.configure do |config|
  # Database cleaner set up below
  config.before(:each) do
    DatabaseCleaner.strategy = :transaction
  end

  # Clean up all jobs specs with truncation
  config.before(:each, js: true) do
    DatabaseCleaner.strategy = :truncation
  end

  config.before(:each) do
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end
end

Answer 1

您的psql版本可能低于8.4，这就是它无法正常工作的原因。使用psql --version查找您的版本，并从数据库清理器源中获取8.4或更高版本。

@restart_identity ||= db_version >=  80400 ? 'RESTART IDENTITY' : ''

我正在运行9.6.2，工作正常。

> truncate users restart identity;
> insert into users (x) values (1);
> select * from users ;

#  id | x 
# ----+---
#   1 | 1

为确保数据库清理工作正常。

require 'rails/all'
require 'database_cleaner'
ActiveRecord::Base.establish_connection('postgres://localhost/test1')
class User < ActiveRecord::Base; end
User.count
# => 1
DatabaseCleaner.clean_with(:truncation, reset_ids: true)

重置串行列。

$ psql -d test1
> insert into users (x) values (1);
> select * from users ;

#  id | x 
# ----+---
#   1 | 1

使用Postgres测试环境的Rails规范，测试表不重启id增量？

1 个答案: