使用simple_form显示基本错误

gem 'simple_form'

<%= simple_form_for @user do |f| %>
  <%= f.input :name %>
  <%= f.input :email %>
  <%= f.input :password %>
  <%= f.input :password_confirmation %>
  <%= f.button :submit %>
<% end %>

def create
  @user = User.new(user_params)
  if @user.save
    # 处理保存成功的逻辑
  else
    render :new
  end
end

<%= simple_form_for @user do |f| %>
  <%= f.input :name %>
  <%= f.input :email %>
  <%= f.input :password %>
  <%= f.input :password_confirmation %>
  <%= f.button :submit %>
  
  <% if @user.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
      <ul>
        <% @user.errors.full_messages.each do |message| %>
          <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>
<% end %>