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POhow to store data to be used in the callback in ActiveRecord model
 

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    <p>user can assign multiple predefined <code>events</code> to a <code>room</code> however, sometimes they might create new <code>events</code> on the fly. </p> <p>I want to capture these new events and add them to a separate table <code>userevent</code> </p> <p>Below is my approach. I am trying to save all the events that don't exist into a <code>:user_events</code> and then callback <code>add_new_events_to_userevents</code> on after_save.</p> <pre><code> after_save :add_new_events_to_userevents attr_reader :event_tokens, :user_events attr_accessible :user_events #not real column in table attr_accessible :fulladdress, :title, :description, :cost, :email, :maximum_capacity, :phone, :user_id, :property_id def add_new_events_to_userevents print "total new events:" + self.user_events.size self.user_events.each do |i| u = Userevent.new u.name = i u.approved = false u.room_id = self.id u.user_id = self.user_id u.save end end def event_tokens=(ids) events = ids.split(',') allowed_events = [] userevents = [] events.each do |i| i = i.strip events = Event.select(:id).where("upper(name) = ?", i.upcase); event = (events.blank? ? nil : events.first) if event.present? allowed_events &lt;&lt; event[:id] else userevents &lt;&lt; i end end self.event_ids = allowed_events #these are events that exist self.user_events = userevents #these are new events, need them in after_save end </code></pre> <p>I am getting an error </p> <pre><code>You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.size </code></pre> <ul> <li>how can I store all new user events and then use them in my <code>after_save</code> callback?</li> <li>in the <code>after_save</code> callback if I call <code>self.id</code> and <code>self.user_id</code> will that give me <code>id</code> and <code>user_id</code> of the record that was just saved to the DB?</li> </ul>
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