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POrails - polymorphic association - one-to-one - Form is submiting nested fields with wrong name
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  1. POrails - polymorphic association - one-to-one - Form is submiting nested fields with wrong name
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    copied!<p>I have User, which can be one of three types: Admin, Student, Teacher. Everyone has other attributes. I am trying polymorphic association one-to-one like this: </p> <p><strong>User</strong></p> <pre><code>class User &lt; ActiveRecord::Base belongs_to :identity, :polymorphic =&gt; true accepts_nested_attributes_for :identity, :allow_destroy =&gt; true attr_accessible :email, :login, :remember_token, :password_confirmation, :password, :role end </code></pre> <p><strong>Student</strong></p> <pre><code>class Student &lt; ActiveRecord::Base attr_accessible :field has_one :user, :as =&gt; :identity end </code></pre> <p><strong>Controller</strong></p> <pre><code>def new @user = User.new end def create @user = User.new(params[:user]) # It fails here. @user.identita.build ... end </code></pre> <p><strong>View</strong></p> <pre><code>&lt;%= form_for(@user) do |f| %&gt; &lt;%= f.label :login %&gt;&lt;br /&gt; &lt;%= f.text_field :login %&gt; &lt;%= f.fields_for [:identity, Student.new] do |i| %&gt; &lt;%= i.label :field %&gt;&lt;br /&gt; &lt;%= i.textfield_select :field %&gt; &lt;% end %&gt; &lt;% end %&gt; </code></pre> <p>When I submit this view (more complex, but this is the core), it sends hash like this: </p> <pre><code>{"utf8"=&gt;"✓", "authenticity_token"=&gt;"...", "user"=&gt;{"login"=&gt;"...", "student"=&gt; {"field"=&gt;"..."} } </code></pre> <p>So it fails on marked line in controller with:</p> <pre><code>ActiveModel::MassAssignmentSecurity::Error in UsersController#create Can't mass-assign protected attributes: student </code></pre> <p>What am I doing wrong? Something like :as=>"student" or twisting the realationship?</p>
 

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