When you use a belongs_to or has_many macro you might be surprised that the methods that it generates does not override a method with the same name. Take this example:

class Project < ActiveRecord::Base
  
  def user
    "foo"
  end
  
  belongs_to :user
  
end

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Project.new.user still returns "foo".

The reason for this is that what belongs_to does is actually this:

class Project < ActiveRecord::Base
  include FeatureMethods
  
  def user
    "foo"
  end
  
end

module Project::FeatureMethods

  def user
    # association getter goes here
  end
  
end

I'm sorry.