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POCan't mass-assign protected attributes: _destroy - Ruby on Rails
 

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  1. POCan't mass-assign protected attributes: _destroy - Ruby on Rails
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    <p>I'm getting this error:</p> <p>"ActiveModel::MassAssignmentSecurity::Error in DaysController#create</p> <p>Can't mass-assign protected attributes: _destroy"</p> <p>I didn't even know that _destroy is an attribute!</p> <p>What I have going on:</p> <p>My model is that I have "Trips" which has many "Days"</p> <p>In the "Show" view of my Trips model, I'm rendering a partial for a Form to add a new "Day":</p> <pre><code>&lt;div id="day_form"&gt; &lt;%= render :partial =&gt; "day_form", :day =&gt; @day %&gt; &lt;/div&gt; </code></pre> <p>My model:</p> <pre><code>class Trip &lt; ActiveRecord::Base attr_accessible :title, :days_attributes has_many :days accepts_nested_attributes_for :days, allow_destroy: true end class Day &lt; ActiveRecord::Base attr_accessible :activity_id, :order, :summary, :trip_id, :activities_attributes belongs_to :trip has_many :activities, :order =&gt; 'position' accepts_nested_attributes_for :activities, allow_destroy: true end </code></pre> <p>When I submit the form, I am getting this Mass Assignment error. Why?</p> <p><strong>EDIT</strong></p> <p>The 'Day' Form looks like this:</p> <pre><code> &lt;%= form_for(@day) do |f| %&gt; &lt;ul&gt; &lt;% @day.errors.full_messages.each do |msg| %&gt; &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; &lt;/div&gt; &lt;% end %&gt; &lt;fieldset&gt; &lt;%= f.label :summary, "Day Summary" %&gt;&lt;br /&gt; &lt;%= f.text_area :summary, :rows =&gt; 1 %&gt;&lt;br /&gt; &lt;%= f.hidden_field :_destroy %&gt; &lt;%= link_to "remove", '#', class: "remove_fields" %&gt; &lt;/fieldset&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre>
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    1. USHung Luu
    1. USHung Luu
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    1. COWhat does your form look like?
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      1. POCan't mass-assign protected attributes: _destroy - Ruby on Rails
      1. USdigicazter
    2. COOkay - I feel really silly. There was a hidden_field of _destroy leftover from another form I reused this code from. Sorry, I'm new at this but shouldn't be making these silly mistakes. Thank you @Digi_Cazter
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      1. POCan't mass-assign protected attributes: _destroy - Ruby on Rails
      1. USHung Luu
    3. CONo problem, I'm glad you were able to find the problem. Happy Coding!
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      1. USdigicazter
 

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