ruby-on-rails - Rails：迁移后运行初始化程序

Question

我有一些从初始化程序运行的代码，它工作正常。（它将默认设置从 yaml 文件保存到rails-settings-cache gem 的数据库。）

但是当我在 Travis CI 上运行它时，由于它是从头开始迁移，初始化程序失败，因为表还不存在。

有没有办法在迁移之后但在应用程序启动之前运行代码？

Answer 1

So while I don't love doing this, an easy way to prevent the initializer from running during db:migrate, but running on application start or test run is to wrap it in a clause testing if the table exists. So if you take your existing initializer code and wrap it in

if ActiveRecord::Base.connection.table_exists? 'table_name'
   ....
end

where 'table_name' is the name of the missing table, then both rake db:migrate and the spec run should be able to complete successfully.