Rake task error: uninitialized constant == Model / Controller classes not loaded

Question

In Rails 3.2.16 execution of this rake task breaks with uninitialized constant error, complaining that the Model class MyModel is not known.

  desc "some rake task"
  task :do_it => :environment do
    # do something depending on a model:
    MyModel.each do |m|
      # do something with model
    end
    # ...
  end

Answer 1

Looks like the root-cause of this is that I had config.threadsafe! enabled in the config files.

To fix this, do this:

  # only enable threadsafe! mode if we are not running rake tasks
  config.threadsafe! unless File.split($0).last == 'rake' # unless it's a rake task