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POUse virtual attribute in nested model before_save callback
 

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    <p>I have a User model and a Tracker model. User has_many Trackers and Tracker belongs_to User. The User model has a virtual attribute called tracker_date that I would like to be able to use in a before_save callback in the Tracker model. The callback is supposed to set the date in the Tracker model for all of the Tracker records updated at the same time through the nested attributes association. Is this possible? Or is there a better way to do what I am trying to do? </p> <p>The view: </p> <pre><code>&lt;%= form_for @user, :url =&gt; {:controller =&gt; 'trackers'}, :method =&gt; 'post' do |f| %&gt; &lt;%= f.label :tracker_date, "Week ending" %&gt; &lt;%= f.text_field :tracker_date %&gt; &lt;br /&gt; &lt;% @user.top_items.each do |item| %&gt; &lt;%= f.fields_for :trackers, item.trackers.build do |g| %&gt; &lt;%= item.top_item_name %&gt; &lt;%= g.text_field :value %&gt; &lt;%= g.hidden_field :position_id, :value =&gt; item.id %&gt; &lt;br /&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;%= f.submit "Submit" %&gt; &lt;% end %&gt; </code></pre> <p>User.rb</p> <pre><code>has_many :trackers accepts_nested_attributes_for :trackers attr_accessor :tracker_date attr_accessible :tracker_date, :trackers_attributes </code></pre> <p>Tracker.rb</p> <pre><code>belongs_to :user attr_accessible :date before_save :set_date def set_date self.date = self.user.tracker_date end </code></pre> <p>In this example, the date does not get set in the Tracker model with the value in the virtual attribute from the User model. I also tried a simple validation in the Tracker model using the virtual attribute from the User model but that did not work either. Is there a way to get it to work or is there a better way to do this that either avoids using the virtual attribute or allows the nested model to access the virtual attribute?</p> <p>Thanks. </p>
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    1. USJosh
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    1. COIn your form_for, why is the controller 'trackers' and not the default 'users'? I'm thinking that when the user clicks Submit, the tracker record is being saved but not the user recored. So the tracker_date isn't being set perhaps? What happens if you use the default and do the tracker fields using `fields_for :tracker` within the user `form_for`?
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      1. USlurker
    2. COGood thought, and thanks, but that isn't the issue. In the trackers controller, it is just doing @user.update_attributes(params[:user]). I've tested that a record will save to both the user model and the tracker model successfully from the form. It is only the virtual attribute that I am having trouble with.
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      1. USJosh
 

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