Rails-在联接表中创建/销毁记录

Question

I'm working on this record insert/delete I'm not sure what the syntax is to perform the query.

I have a user model and an event model. I have created a joining table called Personal that stores the user_id, and event_id of any events that the users like.

I created an "Add" method in my events controller so whenever someone clicks it run to that and perform the create logic I'm trying to develop now.The action is tied to a extra column I added to the grid displaying all the events.

The user model =>

 has_many :personals

The event model =>

has_many :personals

The personal model =>

belongs_to :user
belongs_to :events

I thought it would be something like =>

 @user = User.find(session[:user_id])
 @event = Event.find(params[:id])
 # Personal.new = User.Event?

can anyone help?

Answer 1

If you're using a has_and_belongs_to_many association, which would be unfortunate, removing the associated links can be tricky as there's no identifier for each link.

Using a has_many :through relationship is much easier to maintain and will allow you to do simple things like:

class User < ActiveRecord::Base
  has_many :user_events
  has_many :events,
    :through => :user_events
end

@user.events.delete(@event)

This doesn't remove the Event itself, that'd require an Event#destroy call, but the join record that links the two.