foodsoft/app/models/assignment.rb

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# == Schema Information
# Schema version: 20090102171850
#
# Table name: assignments
#
# id :integer(4) not null, primary key
# user_id :integer(4) default(0), not null
# task_id :integer(4) default(0), not null
# accepted :boolean(1)
#
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class Assignment < ActiveRecord::Base
belongs_to :user
belongs_to :task
# after user is assigned mark task as assigned
def after_create
self.task.update_attribute(:assigned, true)
end
# update assigned-attribute
def after_destroy
self.task.update_attribute(:assigned, false) if self.task.assignments.empty?
end
end