Today I wanted to make a minimal environment for running rake tasks,
background jobs, scripts with script/runner and so on.
I started with this "config/environments/rake.rb" file:
config.frameworks = [ :active_record ]
config.cache_classes = true
config.gems.shift # removes Haml, the first gem dependency in
environment.rb
config.plugins = [ :masochism, :will_paginate, :validates_existence ]
As you can see, I'm loading only ActiveRecord and gems/plugins that go with
it.
But, I had a number of problems with this.
First, the environment-specific configuration files ("environments/ENV.rb")
are being loaded after the frameworks have been loaded. I don't know why is
this, except for the fact that `require_frameworks` method from
Rails::Initializer uses `silence_warnings` from ActiveSupport. So, my
`config.frameworks` override was useless.
Solution: I moved the `require_frameworks`call to the start of
`Initializer#process`. Of course, `silence_warnings` is not defined by that
time so I defined a no-op method on Initializer with the same name.
Second, Initializer wants to `load_application_classes` -- in other
words, preload
everything in the app/ directory (for thread-safety). This is a disaster,
because ActionMailer and ActionController are not loaded.
Solution: add a special-case to prevent it, like
def load_application_classes
super unless Rails.env.rake?
end
I probably could have just said `config.cache_classes = false` instead.
Rails then assumes this is a development environment and doesn't preload.
To conclude, this was all solved by subclassing Rails::Initializer, but I
think Rails should support this out of the box. I propose the following:
1. A tweak I described to solve my first problem;
2. A configuration entry that specifies whether the environment should be
in thread-safe mode. If not, don't bother with preloading, connection pools
in ActiveRecord and such.
Thoughts?
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