Rails initializers are running while migrating database

Question

It is very surprising that Rails's initializers run while running any rake task, including db:migrate and db:seed.

An initializer in my app starts a background thread (a kind of worker process), and it should be executed only when the application is running in debug and production mode.

How to prevent a specific initializer from running when doing rake db:migrate or how to detect in initializer that a rake task is running?

Answer 1

Here is a solution how to prevent an initializer from running in Rake task:

unless ( File.basename($0) == 'rake')
   # Initializer code
end