Attribute not being set

I have this ruby code for radio buttons in my user new form:

<%= f.fields_for :profile, Profile.new 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 %>    

I want to set the type attribute of my Profile model. However, type is not being set and is defaulting to nil. I tried creating this create method in my profile controller but it didn't work:

def create
  @profile = Profile.find(params开发者_开发技巧[:id])
  if params[:profile_attributes][:type] == "artist"
    @profile.type = "artist"
  elsif params[:profile_attributes][:type] == "listener"
    @profile.type = "listener"
  end
end

How can I get type to be set to "artist" or "listener" correctly?

UPDATE:

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

I think you want to access it like this:

params[:user][:profile_attributes][:type]

Your view should look something like:

<%= form_for(setup_user(@user)) do |f| %>
  <p>
    <%= f.label :email %>
    <br/>
    <%= f.text_field :email %>
  </p>
  <%= f.fields_for :profile do |profile| %>
    <%= profile.label :username %>
    <br/>
    <%= profile.text_field :username %>

and in your helpers/application_helper.rb

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

This is just an example.

My First Answer was bad:

Make sure your type strings are CamelCased. Also, I believe type is attr_protected meaning you can not set it via attr_accesible.

Something like this may get you going in the right direction:

class ProfilesController < ApplicationController
  def create
    @profile = profile_type.new(pararms[:profile])
    if @profile.save(params[:profile])
      # ...
    else
      # ...
    end
  end

private

  def profile_type
    params[:profile][:type].classify.constantize if %w(Artist Listener).include? params[:profile][type]
  end

end

Try this function:

   <%= f.fields_for :profile, @user.build_profile(:type => "Artist") do |t| %>