在Rails中使用Ajax进行错误处理3

<%= form_with(model: @model, remote: true) do |form| %>
  <!-- 表单字段 -->
  <%= form.submit %>
<% end %>

def create
  @model = Model.new(model_params)

  respond_to do |format|
    if @model.save
      format.html { redirect_to @model, notice: 'Model was successfully created.' }
      format.json { render :show, status: :created, location: @model }
    else
      format.html { render :new }
      format.json { render json: @model.errors, status: :unprocessable_entity }
      format.js   # 处理Ajax请求的错误处理
    end
  end
end

// create.js.erb

<% if @model.errors.any? %>
  <% @model.errors.full_messages.each do |message| %>
    // 显示错误消息
    alert("<%= message %>");
  <% end %>
<% end %>