所以我開始在rails上學習ajax，並非常慚愧地問一些錯誤，但是這個錯誤讓我很煩，我不明白，這是因爲我的操作系統（windows 10）或我的代碼Rails簡單ajax

所以我有5個文件，其實我只是編輯的代碼生成腳手架後

錯誤總是出錯內部服務器（500），但我不就解決了2天，且數據仍插數據庫但div＃data-list不會刷新

以下是代碼：

我index.html.erb：

上市ajaxxxes

<table> 
    <thead> 
    <tr> 
     <th>Title</th> 
     <th>Description</th> 
     <th colspan="3"></th> 
    </tr> 
    </thead> 
    <div id="data-list"> 
    <%= render 'data' %> 
    </div> 
</table> 

<br> 


<%= render 'form' %> 

<%= link_to 'New Ajaxxx', new_ajaxxx_path %>

我_data.html.erb：

<tbody> 
    <% @ajaxxxes.each do |ajaxxx| %> 
     <tr> 
     <td><%= ajaxxx.title %></td> 
     <td><%= ajaxxx.description %></td> 
     <td><%= link_to 'Show', ajaxxx %></td> 
     <td><%= link_to 'Edit', edit_ajaxxx_path(ajaxxx) %></td> 
     <td><%= link_to 'Destroy', ajaxxx, method: :delete, data: { confirm: 'Are you sure?' } %></td> 
     </tr> 
    <% end %> 
    </tbody>

我_form.html.erb：

<%= form_for(@ajaxxx, remote: true) do |f| %> 
    <% if @ajaxxx.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@ajaxxx.errors.count, "error") %> prohibited this ajaxxx from being saved:</h2> 

     <ul> 
     <% @ajaxxx.errors.full_messages.each do |message| %> 
     <li><%= message %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <div class="field"> 
    <%= f.label :title %><br> 
    <%= f.text_field :title %> 
    </div> 
    <div class="field"> 
    <%= f.label :description %><br> 
    <%= f.text_area :description %> 
    </div> 
    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %>

我ajaxxxes_controller：

class AjaxxxesController < ApplicationController 
    before_action :set_ajaxxx, only: [:show, :edit, :update, :destroy] 

    # GET /ajaxxxes 
    # GET /ajaxxxes.json 
    def index 
    @ajaxxxes = Ajaxxx.all 
    @ajaxxx = Ajaxxx.new 
    end 

    # GET /ajaxxxes/new 
    def new 
    @ajaxxx = Ajaxxx.new 
    end 

    # POST /ajaxxxes 
    # POST /ajaxxxes.json 
    def create 
    @ajaxxx = Ajaxxx.new(ajaxxx_params) 

    respond_to do |format| 
     if @ajaxxx.save 
     format.html { redirect_to action: "index", notice: 'Ajaxxx was successfully created.' } 
     format.json { render :show, status: :created, location: @ajaxxx } 
     format.js 
     else 
     format.html { render :new } 
     format.json { render json: @ajaxxx.errors, status: :unprocessable_entity } 
     end 
    end 
    end 


    private 
    # Use callbacks to share common setup or constraints between actions. 
    def set_ajaxxx 
     @ajaxxx = Ajaxxx.find(params[:id]) 
    end 

    # Never trust parameters from the scary internet, only allow the white list through. 
    def ajaxxx_params 
     params.require(:ajaxxx).permit(:title, :description) 
    end 
end

，最後我create.js.erb：

<% if @ajaxxx.title %> 
      console.log("Ajaxxx created!"); 
      $("#data-list").html("<%= escape_javascript(render 'data') %>"); 
     <% else %> 
      console.log("Failed"); 
     <% end %>

而這裏的日誌：

Started GET "/" for 127.0.0.1 at 2015-11-01 17:06:01 +0700 
     [1m[36mActiveRecord::SchemaMigration Load (0.0ms)[0m [1mSELECT "schema_migrations".* FROM "schema_migrations"[0m 
    Processing by AjaxxxesController#index as HTML 
     [1m[35mAjaxxx Load (0.0ms)[0m SELECT "ajaxxxes".* FROM "ajaxxxes" 
     Rendered ajaxxxes/_data.html.erb (24.0ms) 
     Rendered ajaxxxes/_form.html.erb (60.0ms) 
     Rendered ajaxxxes/index.html.erb within layouts/application (160.0ms) 
    Completed 200 OK in 468ms (Views: 438.2ms | ActiveRecord: 0.0ms) 


    Started GET "/assets/searches.css?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/jquery.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/ajaxxxes.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/application.css?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/jquery_ujs.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/turbolinks.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/indices.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/items.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/searches.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started GET "/assets/application.js?body=1" for 127.0.0.1 at 2015-11-01 17:06:02 +0700 


    Started POST "/ajaxxxes" for 127.0.0.1 at 2015-11-01 17:06:19 +0700 
    Processing by AjaxxxesController#create as JS 
     Parameters: {"utf8"=>"✓", "ajaxxx"=>{"title"=>"Test-51", "description"=>"Test-51"}, "commit"=>"Create Ajaxxx"} 
     [1m[36m (0.0ms)[0m [1mbegin transaction[0m 
     [1m[35mSQL (0.0ms)[0m INSERT INTO "ajaxxxes" ("created_at", "description", "title", "updated_at") VALUES (?, ?, ?, ?) [["created_at", "2015-11-01 10:06:19.915267"], ["description", "Test-51"], ["title", "Test-51"], ["updated_at", "2015-11-01 10:06:19.915267"]] 
     [1m[36m (15.6ms)[0m [1mcommit transaction[0m 
     Rendered ajaxxxes/_data.html.erb (62.5ms) 
     Rendered ajaxxxes/create.js.erb (109.4ms) 
    Completed 500 Internal Server Error in 344ms 

    ActionView::Template::Error (undefined method `each' for nil:NilClass): 
     1: <tbody> 
     2:  <% @ajaxxxes.each do |ajaxxx| %> 
     3:  <tr> 
     4:   <td><%= ajaxxx.title %></td> 
     5:   <td><%= ajaxxx.description %></td> 
     app/views/ajaxxxes/_data.html.erb:2:in `_app_views_ajaxxxes__data_html_erb___834628740_45308136' 
     app/views/ajaxxxes/create.js.erb:3:in `_app_views_ajaxxxes_create_js_erb___336360114_45416052' 
     app/controllers/ajaxxxes_controller.rb:30:in `create' 


     Rendered C:/Ruby22/lib/ruby/gems/2.2.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (0.0ms) 
     Rendered C:/Ruby22/lib/ruby/gems/2.2.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (0.0ms) 
     Rendered C:/Ruby22/lib/ruby/gems/2.2.0/gems/actionpack-4.1.8/lib/action_dispatch/middleware/templates/rescues/template_error.text.erb (665.1ms)

來源

2015-11-01 user5436320

這裏的錯誤：

ActionView::Template::Error (undefined method `each' for nil:NilClass): 
     1: <tbody> 
     2:  <% @ajaxxxes.each do |ajaxxx| %>

的問題是沒有定義的變量@ajaxxxes。

出現此錯誤在app/controllers/ajaxxxes_controller.rb:30:in create（在format.js線，這將調用/app/views/ajaxxxes/create.js.erb：

<% if @ajaxxx.title %> 
    console.log("Ajaxxx created!"); 
    $("#data-list").html("<%= escape_javascript(render 'data') %>"); 
<% else %> 
    console.log("Failed"); 
<% end %>

這裏的問題是：<%= escape_javascript(render 'data') %>

app/views/ajaxxxes/_data.html.erb包含參考@ajaxxxes：

<tbody> 
    <% @ajaxxxes.each do |ajaxxx| %>

Rails partials旨在從應用程序的任何部分調用。因此，你應該從來沒有參考@instance裏面的變量（該變量可能不可用，因爲它不是在這種情況下）。

因此，您的錯誤修復是要麼使用"local" variables，或者從您的create.js.erb忽略調用data：

#app/views/ajaxxxes/create.js.erb 
<% if @ajaxxx.title %> 
    console.log("Ajaxxx created!"); 
    $("#data-list").html("<%=j render 'data', locals: {ajaxxxes: @ajaxxxes} %>"); 
<% else %> 
    console.log("Failed"); 
<% end %> 

#app/controllers/ajaxxxes_controller.rb 
class AjaxxxesController < ApplicationController 
    def create 
     @ajaxxxes = Ajaxxx.all 
     ... 
    end 
end 

#app/views/ajaxxxes/_data.html.erb 
<tbody> 
    <% ajaxxxes.each do |ajaxxx| %> 
     <tr> 
     <td><%= ajaxxx.title %></td> 
     <td><%= ajaxxx.description %></td> 
     <td><%= link_to 'Show', ajaxxx %></td> 
     <td><%= link_to 'Edit', edit_ajaxxx_path(ajaxxx) %></td> 
     <td><%= link_to 'Destroy', ajaxxx, method: :delete, data: { confirm: 'Are you sure?' } %></td> 
     </tr> 
    <% end %> 
</tbody>

來源

2015-11-01 10:57:27

的錯誤信息是很清楚的：

ActionView::Template::Error (undefined method `each' for nil:NilClass): 
    1: <tbody> 
    2:  <% @ajaxxxes.each do |ajaxxx| %>

這意味着@ajaxxxes變量是nil而不是數組。請檢查您的相應控制器方法是否缺少指派到@ajaxxxes（或者可能存在拼寫錯誤）。

來源

2015-11-01 10:26:14 spickermann

ActionView::Template::Error (undefined method `each' for nil:NilClass)

的問題是在這裏在這一行

<% @ajaxxxes.each do |ajaxxx| %>

由於該碼屬於部分，你應該通過實例變量（@ajaxxxes）作爲一個局部變量，而渲染局部

以下更改應該可以工作

<%= render 'data', ajaxxxes: @ajaxxxes %>

，並更改

<% @ajaxxxes.each do |ajaxxx| %>

到

<% ajaxxxes.each do |ajaxxx| %>

來源

2015-11-01 10:37:58 Pavan

Rails簡單ajax

上市ajaxxxes

回答

相關問題