Question

我正在尝试在用户之间为我的应用程序实现follow / unfollow功能。我正在使用devise + omniauth并使用单独的用户控制器。当我点击跟随按钮时，它不会对应该计算以下/关注者等的数字做任何事情。在控制台中我得到这些错误

Processing by RelationshipsController#create as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ReTtZn0GbB7f5LROr6FLnw40ErDDcubDa8/yLnyVd/FIhxM3qjZI8pjYDAGmuGJiv1paGVjhp/LMVmFtkcZVwQ==", "followed_id"=>"1", "commit"=>"Follow"}
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 2]]
  User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
   (0.1ms)  begin transaction
WARNING: Can't mass-assign protected attributes for Relationship: followed_id
        app/models/user.rb:21:in `follow'
        app/controllers/relationships_controller.rb:7:in `create'
   (0.1ms)  commit transaction
  Relationship Load (0.3ms)  SELECT  "relationships".* FROM "relationships" WHERE "relationships"."follower_id" = ? AND "relationships"."followed_id" = ? LIMIT 1  [["follower_id", 2], ["followed_id", 1]]
  Rendered users/_unfollow.html.erb (11.5ms)
  Rendered relationships/create.js.erb (13.9ms)
Completed 500 Internal Server Error in 38ms

ArgumentError (First argument in form cannot contain nil or be empty):
  app/views/users/_unfollow.html.erb:1:in `_app_views_users__unfollow_html_erb___2456782614560778317_70319555077280'
  app/views/relationships/create.js.erb:1:in `_app_views_relationships_create_js_erb__3841758023410302021_45366420'
  app/controllers/relationships_controller.rb:8:in `create'

我的代码行如下

relationship_controller

class RelationshipsController < ApplicationController
  before_filter :authenticate_user!

  def create
    @user = User.find(params[:followed_id])
    current_user.follow(@user)
    respond_to do |format|
      format.html { redirect_to @user }
      format.js
    end
  end

  def destroy
    @user = Relationship.find(params[:id]).followed
    current_user.unfollow(@user)
    respond_to do |format|
      format.html { redirect_to @user }
      format.js
    end
  end
end

_follow_form.html.erb

  <div id="follow_form">
  <% if current_user.following?(@user) %>
    <%= render 'unfollow' %>
  <% else %>
    <%= render 'follow' %>
  <% end %>
  </div>

_unfollow.html.erb

<%= form_for(current_user.active_relationships.find_by(followed_id: @user.id),
             html: { method: :delete },
             remote: true) do |f| %>
  <%= f.submit "Unfollow", class: "btn" %>
<% end %>

创建/销毁.js.html

$("#follow_form").html('<%= escape_javascript(render('users/unfollow')) %>')
$("#followers").html('<%= @user.followers.count %>')

$("#follow_form").html('<%= escape_javascript(render('users/follow')) %>')
$("#followers").html('<%= @user.followers.count %>')

提前谢谢..我很想弄明白......

已编辑我的错误引用

Answer 1

您的错误是提交的表单为空/无。

这是由于不接受表单及其属性。

将此添加到您的控制器

private
    def private_params
        params[:yourmodel].permit(:yourkeys, :anotherkey]
end

Answer 2

我能够通过删除旧gem中的protected_attributes gem来解决这个问题。它是轨道3的残余物并与新轨道4发生冲突。因此，如果有人遇到问题。请删除此gem并注意rails 4现在正在使用强参数。感谢。

Answer 3

我的错误几乎和你一样，我无法回想起。

对我而言，一切运行良好，关注/取消关注功能正常运行，但当我取消关注用户时，我总是遇到这种错误。

我的解决方案是将取消关注form_for更改为link_to：

<%= link_to current_user.active_relationships.find_by(followed_id: @user.id), remote: true, method: :delete,  data: { confirm: 'Are you sure?' } do %>
  <button class="btn" type="submit">Unfollow</button>
<% end %>

错误消失了。

请查看此simple & quick tutorial了解更多信息。

rails 4试图在用户之间实现follow / unfollow功能，但是错误

3 个答案: