Can't get my type attribute set in my Profile model for STI

I have a User model which has_one :profile, and the profile model has a type column for Single Table Inheritance. I want a user to set type upon signing up, and I'm having trouble doing this.

i'm trying this in my profiles controller:

def create
   @profile = Profile.find(params[:id])
   type = params[:user][:profile_attributes][:type]
   if type && ["Artist","Listener"].include?(type)
    @profile.update_attribute(:type,type)    
   end
end

and this in my form for the User new view:

<%= form_for(setup_user(@user)) do |f| %>
...
  <%= f.fields_for :profile do |t| %>
 <div class ="field">
    <%= t.label :type, "Are you an artist or listener?" %><br />
    <p> Artist: <%= t.radio_button :type, "Artist" %></p>
    <p> Listener: <%= t.radio_button :type, "Listener" %></p>
  </div>
  <% end %>
...
<% end %>   

and in my application helper:

def setup_user(user)
  user.tap do |u|
    u.build_profile if u.profile.nil?
  end
end

I can't seem to get type set when a User is created. It still defaults to nil. Why is this and how can I accomplish it? I'd appreciate a code example.

UPDATE:

This is 开发者_运维知识库the relevant code in my User model:

has_one :profile 
accepts_nested_attributes_for :profile
before_create :build_profile

UPDATE 2: I get this error: WARNING: Can't mass-assign protected attributes: type

It looks like the object isn't being saved to the database. Try something like this:

def create
  @profile = Profile.find(params[:id])
  type = params[:user][:profile_attributes][:type]
  if type && ["Artist","Listener"].include?(type)
    @profile.update_attribute(:type,type)    
  end
end

Your last issue can be resolved by adding

attr_accessible :type

"type" is a protected attribute and you can't mass-assign a protected attribute.

The column 'type' is reserved for storing the class in case of inheritance. Try renaming the table column to something like "modelname_type".

Replace your create method with this one:

def create
  profile_type = params[:user][:profile][:type].constantize
  if ["Artist", "Listener"].include? profile_type
    @profile = current_user.profile = profile_type.new
    current_user.save!
  else
    flash[:alert] = "Profile type not supported"
  end
end

UPDATE: This is not really necessary. Useful code perhaps, but not necessary as a solution for the above problem.