Ajax 请求导致“参数丢失或值为空”错误

Question

好的，在我修复了this issue 之后，现在我有了这个新的，我似乎不明白。

这是我的观点和 Javascript 代码：

<script language="javascript" type="text/javascript">

function getConfig(){
$.ajax({
    url: "<%= get_config_projects_url %>",
    data: {
        id: <%= @project.id %>,
        unit_mgt_address: $('.unit_mgt_address_class').val(),
    }
});
}

</script>

<%= form_for(@project) do |f| %>
  <input type=button onClick="getConfig()"/>
  <div class="field">
    <%= f.label :Unit Management Address %><br>
    <%= f.text_field :UnitMgtAddress, :class=>'unit_mgt_address_class' %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

我的控制器

class ProjectsController < ApplicationController
  before_action :set_project, only: [:show, :edit, :update, :destroy]

  <many other methods go here>

  # GET /projects/1
  # GET /projects/1.json
  def get_config

    @project = Project.find(params[:id])

    respond_to do |format|
      if @project.update(project_params)
        format.js
        format.html { render action: "edit", notice: 'Project Get_Config Successful!' }
      else
        format.html { render action: "update" }
        format.json { render json: @project.errors, status: :unprocessable_entity }
      end
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_project
    @project = Project.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def project_params
    params.require(:project).permit(:UnitMgtAddress)
  end
end

当我点击“刷新”按钮时，我收到以下错误消息：

Started GET "/projects/get_config?id=9&unit_mgt_address=5.5.5.5" for 127.0.0.1 at 2014-04-29 22:48:37 -0700
Processing by ProjectsController#get_config as */*
  Parameters: {"id"=>"9", "unit_mgt_address"=>"5.5.5.5"}
  Project Load (1.0ms)  SELECT  "projects".* FROM "projects"  WHERE "projects"."id"= ? LIMIT 1  [["id", 9]]
Completed 400 Bad Request in 6ms

ActionController::ParameterMissing (param is missing or the value is empty: project):
  app/controllers/projects_controller.rb:128:in `project_params'
  app/controllers/projects_controller.rb:91:in `block in get_config'
  app/controllers/projects_controller.rb:89:in `get_config'


  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/_source.erb (2.0ms)
  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (1.0ms)
  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (1.0ms)
  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb (63.0ms)

我尝试了很多方法通过 Javascript 将 ":project" 参数传递给控制器​​，但我没有运气。

有什么帮助吗？

感谢和最好的问候

更新 1 根据要求，这些是我为 get_config 和 set_config 方法添加的路由

resources :projects do
  collection do
    get :get_config
    get :set_config
  end
end

工作解决方案 1

这是对我有用的代码更改：我将按钮移到表单外并替换为以下内容

<%= button_to 'Get Config', get_config_projects_url(id: @project.id, project: { unit_mgt_address: @project.UnitMgtAddress }), remote: true, method: :get %>

工作解决方案 2（解决方法）

function getConfig(){
    $.ajax({
        url: "<%= get_config_projects_url(project: { id: @project.id, unit_mgt_address: @project.UnitMgtAddress }) %>",
        data: {
            id: <%= @attero.id %>,
            unit_mgt_address: $('.unit_mgt_address_class').val(),
        }

    });
}

Answer 1

对于多年后观看此内容的任何人。 我认为您需要在数据下放置一个“项目”对象参数以包含您的预期参数。对于其他任何人，它是对象名称（:page、:person 等）

Rails 期望在其控制器中实现这一点。

所以;

data: {
  project: {
    id: <%= @attero.id %>,
    unit_mgt_address: $('.unit_mgt_address_class').val()
  }    
}

Answer 2

您真的应该让 Rails 为您处理 AJAX 请求。我会将该按钮拉出正在提交的表单并将其放入自己的link_to 或button_to，如果您想使用按钮，只需添加method: :get。设置remote: true，它会为你处理所有的AJAX工作。

<%= link_to 'Get Config', get_config_projects_url(@project.id, project: { unit_mgt_address: @project.UnitMgtAddress }), remote: true %>

或

<%= button_to 'Get Config', get_config_projects_url(@project.id, project: { unit_mgt_address: @project.UnitMgtAddress }), remote: true, method: :get %>

可能需要稍微调整语法，特别是针对您的路径，但让 Rails 管理这类事情比您尝试做的要干净得多。阅读 button_to here 的语法。

Answer 3

这行得通吗？

data: {
    "id": <%= @project.id %>,
    "project[UnitMgtAddress]": $('.unit_mgt_address_class').val(),
}