Rails has_many with alias name

You could also use alias_attribute if you still want to be able to refer to them as tasks as well:

class User < ActiveRecord::Base
  alias_attribute :jobs, :tasks

  has_many :tasks
end

Give this a shot:

has_many :jobs, foreign_key: 'user_id', class_name: 'Task'

Note, that :as is used for polymorphic associations.

Also, foreign_key option for has_many.