assert_select "div" <div>foobar</div>
assert_select "div", "foobar" <div>foobar</div>

assert_select "div.nav" <div class="nav">foobar</div>

assert_select "div#profile" <div id="profile">foobar</div>

assert_select "div[name=yo]" <div name="yo">hey</div>

assert_select "a[href=?]", ’/’, count: 1 <a href="/">foo</a>

assert_select "a[href=?]", ’/’, text: "foo" <a href="/">foo</a>

rails generate devise:views
      invoke  Devise::Generators::SharedViewsGenerator

      create    app/views/devise/shared

      create    app/views/devise/shared/_links.html.erb

      invoke  form_for

      create    app/views/devise/confirmations

      create    app/views/devise/confirmations/new.html.erb

      create    app/views/devise/passwords

      create    app/views/devise/passwords/edit.html.erb

      create    app/views/devise/passwords/new.html.erb

      create    app/views/devise/registrations

      create    app/views/devise/registrations/edit.html.erb

      create    app/views/devise/registrations/new.html.erb

      create    app/views/devise/sessions

      create    app/views/devise/sessions/new.html.erb

      create    app/views/devise/unlocks

      create    app/views/devise/unlocks/new.html.erb

      invoke  erb

      create    app/views/devise/mailer

      create    app/views/devise/mailer/confirmation_instructions.html.erb

      create    app/views/devise/mailer/reset_password_instructions.html.erb

      create    app/views/devise/mailer/unlock_instructions.html.erb

 home_about GET      /home/about(.:format)                  home#about

               home_team GET      /home/team(.:format)                   home#team

               home_help GET      /home/help(.:format)                   home#help

                   users GET      /users(.:format)                       users#index

                         POST     /users(.:format)                       users#create

                new_user GET      /users/new(.:format)                   users#new

               edit_user GET      /users/:id/edit(.:format)              users#edit

                    user GET      /users/:id(.:format)                   users#show

                         PATCH    /users/:id(.:format)                   users#update

                         PUT      /users/:id(.:format)                   users#update

                         DELETE   /users/:id(.:format)                   users#destroy

        new_user_session GET      /users/sign_in(.:format)               devise/sessions#new

            user_session POST     /users/sign_in(.:format)               devise/sessions#create

    destroy_user_session DELETE   /users/sign_out(.:format)              devise/sessions#destroy

 user_omniauth_authorize GET|POST /users/auth/:provider(.:format)        devise/omniauth_callbacks#passthru {:provider=>/(?!)/}

  user_omniauth_callback GET|POST /users/auth/:action/callback(.:format) devise/omniauth_callbacks#:action

           user_password POST     /users/password(.:format)              devise/passwords#create

       new_user_password GET      /users/password/new(.:format)          devise/passwords#new

      edit_user_password GET      /users/password/edit(.:format)         devise/passwords#edit

                         PATCH    /users/password(.:format)              devise/passwords#update

                         PUT      /users/password(.:format)              devise/passwords#update

cancel_user_registration GET      /users/cancel(.:format)                devise/registrations#cancel

       user_registration POST     /users(.:format)                       devise/registrations#create

   new_user_registration GET      /users/sign_up(.:format)               devise/registrations#new

  edit_user_registration GET      /users/edit(.:format)                  devise/registrations#edit

                         PATCH    /users(.:format)                       devise/registrations#update

                         PUT      /users(.:format)                       devise/registrations#update

                         DELETE   /users(.:format)                       devise/registrations#destroy

       user_confirmation POST     /users/confirmation(.:format)          devise/confirmations#create

   new_user_confirmation GET      /users/confirmation/new(.:format)      devise/confirmations#new

                         GET      /users/confirmation(.:format)          devise/confirmations#show

                    root GET      /                                      home#index

class UsersController < ApplicationController

def show

@user = User.find(params[:id])

debugger#调试器

end

def new

end

end

 devise_for :users, :controllers => {:registrations => "devise_customed/registrations"}

    class DeviseCustomed::RegistrationsController < Devise::RegistrationsController

      def new

        super

      end  

      def create

        # add custom create logic here

        super do |resource|

          resource.group = params[:user][:group]

        end

      end  

      def update

        super

      end

class DeviseCustomed::RegistrationsController < Devise::RegistrationsController  
  def new  
    super  
  end  
  
  def create  
    @user = User.new(user_params)
    if @user.save

    else
      render 'new'
    end
    # add custom create logic here  
    super do |resource|  
      resource.group = params[:user][:group]  
    end  
  end  
  
  def update  
    super  
  end  

  private
    def user_params
      params.require(:user).premit(:name, :name, :encrypted_password)
    end
end  

 if @user.save

      redirected_ro @user

    else

      render 'new'

    end

protected

  def email_required?
    false
  end

config.authentication_keys = [ :username, :email ]

class ApplicationController < ActionController::Base

  # Prevent CSRF attacks by raising an exception.

  # For APIs, you may want to use :null_session instead.

  protect_from_forgery with: :exception

  before_action :mailer_set_url_options

  before_action :configure_permitted_parameters, if: :devise_controller?

  def mailer_set_url_options

    ActionMailer::Base.default_url_options[:host] = request.host_with_port

  end

  protected

  def configure_permitted_parameters

    devise_parameter_sanitizer.for(:sign_up) << :name　　　　#修改参数，可以在表里添加name

  end

end