Creating a `Users` show page using Devise

Solution 1:

You should generate a users_controller which inherits from application_controller and define there your custom show method. Don't forget to create a view and routes for it. Ex:

#users_controller.rb
def show
  @user = User.find(params[:id])
end

#in your view
<%= @user.name %>

#routes.rb
match 'users/:id' => 'users#show', via: :get
# or 
get 'users/:id' => 'users#show'
# or
resources :users, only: [:show]

Solution 2:

Don't forget that your users routes should be below the devise_for users routes, like this:

#routes.rb
devise_for :users
resources :users, :only => [:show]

Also, if you are using a username or an email as the primary key instead of the usual id, you should avoid routing conflicts by declaring your routes as follow:

#routes.rb
devise_for :users, :path_prefix => 'd'
resources :users, :only => [:show]