Question

我正在尝试在我的评论表单提交中添加ajax，当我尝试渲染部分时我遇到了错误，我不知道如何解决它。我已经正确设置了一切，并且评论得到了很好的创建。但后来我尝试渲染部分注释，我得到了这个错误：

undefined local variable or method `each' for #<#<Class:0xae4d760>:0xae59a78>

我的 create.js.erb

$("#comm_form_wrap").html("<%= escape_javascript(render :partial => "statuses/comment_form") %>");
$('#comment_box').val('');
$("#comments_wrap").html("<%= escape_javascript(render :partial => "statuses/comments") %>")

当我尝试渲染statuses/comments时导致错误。

这是我的部分：

<% @comments.each do |comment| %>
    <div class="com_con">
        <%= Rinku.auto_link(comment.content).html_safe %>
    </div>
<% end %>

然后我尝试传递像这样的变量

$("#comments_wrap").html("<%= escape_javascript(render :partial => "statuses/comments", :locals => {:comment => comment}) %>")

但它会出现此错误

undefined local variable or method `each' for #<#<Class:0xae4d760>:0xae59a78>

不确定我在这里缺少什么，我确定它很小。任何人都可以帮助我吗？

查看

<% if member_signed_in? %>
    <div id="comm_form_wrap">
        <%= render "comment_form" %>
    </div>

    <div id="comments_wrap">
        <%= render "comments" %>
    </div>
<% end %>

** **编辑

comments_controller.rb

class CommentsController < ApplicationController

before_filter :authenticate_member!
before_filter :load_commentable
before_filter :find_member

def index
   redirect_to root_path
end

def new
    @comment = @commentable.comments.new
end

def create
    @comment = @commentable.comments.new(params[:comment])
    @comment.member = current_member
    respond_to do |format|
        if @comment.save
          format.html { redirect_to :back }
          format.json
          format.js
        else
          format.html { redirect_to :back }
          format.json
          format.js
        end
    end 
end

def destroy
    @comment = Comment.find(params[:id])
    respond_to do |format|
        if @comment.member == current_member || @commentable.member == current_member
          @comment.destroy
          format.html { redirect_to :back }
        else
          format.html { redirect_to :back, alert: 'You can\'t delete this comment.' }
        end
    end 
end

private

def load_commentable
    klass = [Status, Medium, Project, Event, Listing].detect { |c| params["#{c.name.underscore}_id"] }
    @commentable = klass.find(params["#{klass.name.underscore}_id"])
end

def find_member
    @member = Member.find_by_user_name(params[:user_name])
end 

end

statuses_controller

def show
    @status = Status.find(params[:id])
    @commentable = @status
    @comments = @commentable.comments.order('created_at desc').page(params[:page]).per_page(15)
    @comment = Comment.new
    respond_to do |format|
      format.html # show.html.erb
      format.json { redirect_to profile_path(current_member) }
      format.js
    end
end

日志

Processing by StatusesController#show as HTML
    Parameters: {"id"=>"86"}
    [1m[35mMember Load (1.0ms)[0m  SELECT "members".* FROM "members" WHERE "members"."user_name" IS NULL LIMIT 1
    [1m[36mStatus Load (0.0ms)[0m  [1mSELECT "statuses".* FROM "statuses" WHERE "statuses"."id" = ? LIMIT 1[0m  [["id", "86"]]
    [1m[35mComment Load (2.0ms)[0m  SELECT "comments".* FROM "comments" WHERE "comments"."commentable_id" = 86 AND "comments"."commentable_type" = 'Status' ORDER BY created_at desc LIMIT 15 OFFSET 0
    [#<Comment id: 82, content: "and why not try again ha", commentable_id: 86, commentable_type: "Status", member_id: 1, created_at: "2014-06-26 06:27:05", updated_at: "2014-06-26 06:27:05">]
    [1m[36mMember Load (1.0ms)[0m  [1mSELECT "members".* FROM "members" WHERE "members"."id" = 1 LIMIT 1[0m
    [1m[35mCACHE (0.0ms)[0m  SELECT "members".* FROM "members" WHERE "members"."id" = 1 LIMIT 1
    [1m[36m (0.0ms)[0m  [1mSELECT COUNT(*) FROM "comments" WHERE "comments"."commentable_id" = 86 AND "comments"."commentable_type" = 'Status'[0m
    Rendered statuses/_comment_form.html.erb (8.0ms)
    [1m[35mCACHE (0.0ms)[0m  SELECT "members".* FROM "members" WHERE "members"."id" = 1 LIMIT 1
    Rendered statuses/_comments.html.erb (95.0ms)
    Rendered statuses/show.html.erb within layouts/application (406.0ms)
    Rendered layouts/_query.html.erb (108.0ms)
    Rendered search/_search.html.erb (22.0ms)
    Rendered layouts/_menu.html.erb (592.0ms)
Completed 200 OK in 2956ms (Views: 2312.1ms | ActiveRecord: 10.0ms | Solr: 0.0ms)

Answer 1

问题是你的部分是在呼叫@comments.each：

<% @comments.each do |comment| %>

2个问题：

@comments不存在

部分需要使用local变量（他们不能依赖@instance变量）

-

<强>局部模板

你最好这样做：

<%= render partial"statuses/comments", collection: @comments, as: comment %>

在Rails＆＃39;中有一个鲜为人知的功能。部分允许你基本上＆＃34;重新加载＆＃34; each member of a collection的部分内容。

这很重要的原因是因为它从你的部分中删除了很多代码。如果你使用我上面发布的部分内容，你只需要里面的部分代码：

#app/views/statuses/_comments.html.erb <div class="com_con"> <%= Rinku.auto_link(comment.content).html_safe %> </div>

如果您设置了正确的@instance variable，并将其传递给collection的{{1}}选项，Rails基本上会在循环中重新加载部分，就像您使用{{partial一样1}}现在循环

这也适用于单一项目：

.each

-

实例变量

第二个问题是您<%= render partial: "statuses/comments", object: @comment, as: comment %>
的设置
在您的控制器中，您没有设置instance variable实例变量。这意味着您无法将此变量的内容加载到视图中，从而导致像您一样的问题

解决此问题的方法非常简单 - 使用您在控制器中设置的@comments！

-

<强>逃逸

您可能还需要查看JS中的escape quotes：

@instance variables

我不确定这是否适用于这种情况，但是我做知道你是否将引号封装在另一个集合中，你会从你的JS中得到错误

Answer 2

上面的答案帮助我解决了这个问题。将注释呈现为集合帮助我通过ajax呈现部分，我还需要在@comments中的create操作中定义comments_controller以确保它不会呈现空白。

未定义的局部变量或方法ajax渲染部分轨道

2 个答案: