Q:

Devise Views with Multiple Models

I have two models, admins and users. I have set scoped views = true within devise.rb. I also have generated two different set of devise views. For some reason when I click on edit admin registration, it gives me an error 
NoMethodError in Aregistrations#edit 
undefined method `email' for nil:NilClass

It highlights this:
<%= gravatar_for @user %>

and points to "app/views/devise/registrations/edit.html.erb"
In my "config/initializer/devise.rb" file it has:
config.scoped_views = true

In my "config/routes.rb" file I have
devise_for :admins, :controllers => {:registrations => "aregistrations"}
devise_for :users, :controllers => {:registrations => "registrations"}, :path_prefix => 'd'
resources :users, :only =>[:show]

In my "app/controllers/aregistrations_controller.rb" I have
def update
  new_params = params.require(:admin).permit(:email, :username, :current_password, :password, :password_confirmation)
  change_password = true
  if params[:admin][:password].blank?
    params[:admin].delete("password")
    params[:admin].delete("password_confirmation")
    new_params = params.require(:admin).permit(:email, :username)
    change_password = false
  end

  @admin = Admin.find(current_admin.id)
  is_valid = false

  if change_password
    is_valid = @admin.update_with_password(new_params)
  else
    is_valid = @admin.update_without_password(new_params)
  end

  if is_valid
    set_flash_message :notice, :updated
    sign_in @admin, :bypass => true
    redirect_to after_update_path_for(@admin)
  else
    render "edit"
  end
end

In my views I have a devise folder - for the user model and an admins folder for the admin model.
In my "app/views/devise/registrations/edit.html.erb" I have 
<%= gravatar_for @user %>
<a href="http://gravatar.com/emails">change</a></br></br></br></br>

I have it set up to edit your profile and your gravtar image for users only. 
In my "app/views/layouts/_header.html.erb" file I have
<% if admin_signed_in? %>
<li><%= link_to "Edit Account", edit_admin_registration_path %></li>
<% else %> 
.....
<% end %>

Why does Devise look for the user gravatar when I click on the edit admins path and have scoped views on?
-------------------- edit
In my **"app/controllers/users_controller.rb" ** file 
class UsersController < ApplicationController
before_filter :authenticate_admin!, :except => [:show]

  def index
    @users = User.paginate(page: params[:page])
  end

  def show
    @user = User.find_by_username(params[:id])
    @reviews = @user.reviews.paginate(page: params[:page])
  end
end

A:

I solved this with the help from another post Override Devise Registrations Controller Two Times? I found that I needed to create a directory within my "app/controllers" directory. This is how you use the scoped controller:
"app/controllers/admin/registrations_controller.rb"
class Admin::RegistrationsController < Devise::RegistrationsController
  #Your Code Here
end

I can leave my first controller and keep it for the users "app/controllers/registrations_controller.rb"
class RegistrationsController < Devise::RegistrationsController
  #Your Code Here
end

My "config/routes.rb" will look like:
devise_for :admins, :controllers => {:registrations => "admins/registrations"}
devise_for :users, :controllers => {:registrations => "registrations"}

