I have users and issues joined by a votership model. Users can vote on issues. They can either vote up or down (which is recorded in the votership model). First, I want to be able to prevent users from casting multiple votes in one direction. Second, I want to allow users to cast the opposite vote. So, if they voted up, they should still be able to vote down which will replace the up vote. Users should never be able to vote on an issue twice. Here are my files:
class Issue < ActiveRecord::Base
has_many :associations, :dependent => :destroy
has_many :users, :through => :associations
has_many :voterships, :dependent => :destroy
has_many :users, :through => :voterships
belongs_to :app
STATUS = ['Open', 'Closed']
validates :subject, :presence => true,
:length => { :maximum => 50 }
validates :description, :presence => true,
:length => { :maximum => 200 }
validates :type, :presence => true
validates :status, :presence => true
def cast_vote_up!(user_id, direction)
voterships.create!(:issue_id => self.id, :user_id => user_id,
:direction => direction)
end
end
class Votership < ActiveRecord::Base
belongs_to :user
belongs_to :issue
end
class VotershipsController < ApplicationController
def create
session[:return_to] = request.referrer
@issue = Issue.find(params[:votership][:issue_id])
@issue.cast_vote_up!(current_user.id, "up")
redirect_to session[:return_to]
end
end
class User < ActiveRecord::Base
authenticates_with_sorcery!
attr_accessible :email, :password, :password_confirmation
validates_confirmation_of :password
validates_presence_of :password, :on => :create
validates_presence_of :email
validates_uniqueness_of :email
has_many :associations, :dependent => :destroy
has_many :issues, :through => :associations
has_many :voterships, :dependent => :destroy
has_many :issues, :through => :voterships
end
You would put the uniqueness constraint on the Votership
model. You don't need to put validations on the association itself.
class Votership < ActiveRecord::Base
belongs_to :user
belongs_to :issue
validates :issue_id, :uniqueness => {:scope=>:user_id}
end
This means a user can only have a single vote on a given issue (up or down).
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