ruby on rails - virtual attributes -

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<%= form_for(@membership) |f| %>   <%= f.collection_select :user_id, user.all, :id, :email %>   <%= f.collection_select :role_id, role.all, :id, :name %>   <%= f.submit %> <% end %>

what i'm trying instead of using select box users, want put text field users email. 

<%= form_for(@membership) |f| %>   <%= f.text_field :email %>   <%= f.collection_select :role_id, role.all, :id, :name %>   <%= f.submit %> <% end %>

membership.rb

belongs_to :user belong_to :role  attr_accessor :email def email  self.user.email if self.user end

what dont know write in controller make work , attr accessor using thing , email method ok? appreciated. 

  def create      @membership = membership.new(params[:membership])      if @membership.save         redirect_to(memberships_url)       else        render :action => "new"   end

if want update existing users only, you'll have find user email in create action, since membership needs user_id , role_id.


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