ruby-on-rails-3 - Ruby on Rails 在不更改 URL 的情况下呈现注册尝试失败

Question

大家好，我是 ruby​​ on rails 的新手，我只想问一下如何在不更改 URL 和验证的情况下呈现失败的注册尝试？

Answer 1

注册新用户的表格-

app/views/users/new.html.erb

<h2>Sign up</h2>

<% form_for(@user) do |f| %>
  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :email %><br />
    <%= f.text_field :email %>
  </div>
  <div class="field">
    <%= f.label :password %><br />
    <%= f.password_field :password %>
  </div>
  <div class="field">
    <%= f.label :password_confirmation, "Confirmation" %><br />
    <%= f.password_field :password_confirmation %>
  </div>
  <div class="actions">
    <%= f.submit "Sign up" %>
  </div>
<% end %>

将 @user 变量添加到新操作 -

app/controllers/users_controller.rb

class UsersController < ApplicationController
  .
  .
  .
  def new
    @user = User.new
    @title = "Sign up"
  end
end

可以处理注册失败（但不成功）的创建操作-

app/controllers/users_controller.rb

class UsersController < ApplicationController
  .
  .
  .
  def create
    @user = User.new(params[:user])
    if @user.save
      # Handle a successful save.
    else
      @title = "Sign up"
      render 'new'
    end
  end
end

将错误消息显示添加到注册表单的代码-

app/views/users/new.html.erb

<h2>Sign up</h2>

<% form_for(@user) do |f| %>
  <%= f.error_messages %>
  .
  .
  .
<% end %>