Question

我正在构建一个应用程序（在Michael Hartl's chapter 11之后），用户可以在其中跟踪由其他用户创建的项目。

我创建了一个ProjectRelationship模型来保存两个组件：用户的follower_id和项目的projectuser_id。外键已经设置好了。

现在，我的_follow_form.html.erb页面呈现＆＃34;关注＆＃34;或者＆＃34;取消关注＆＃34;取决于current_user是否跟随项目。请参阅下面的代码，看看我错过了什么。

现在，在每个项目显示页面上生成关注按钮。但是，当我单击_follow.html.erb生成的按钮跟随按钮时，由于POST没有发生，因此当我调用@project.followers.count时，它似乎不会跟随项目或更新计数。

因此，当我点击关注按钮时，网址变得混乱。见例：

#Goes from
domain.com/projects/21

#to
domain.com/projects/21?utf8=%E2%9C%93&authenticity_token=5EQmU0EkHB5yKDYakqL78piMWzZl0CfdpHFEqBeQiN4%3D&project_relationship%5Bprojectuser_id%5D=21&commit=Follow%22

*的 *更新：它似乎现在有效，但我不确定我是否真的改变了什么，但摆脱了follower_id索引：unique =＆gt;通过迁移变更确实。

schema.rb

create_table "project_relationships", :force => true do |t|
  t.integer  "follower_id"
  t.datetime "created_at",     :null => false
  t.datetime "updated_at",     :null => false
  t.integer  "projectuser_id"
end

add_index "project_relationships", ["follower_id"], :name => "index_project_relationships_on_follower_id", :unique => true
add_index "project_relationships", ["projectuser_id"], :name => "index_project_relationships_on_projectuser_id"

的routes.rb

resources :projects do       
  resources :comments 
  member do
    get :following
  end   
end
resources :project_relationships, only: [:create, :destroy]

project_relationship.rb

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

   belongs_to :user, foreign_key: "follower_id"
   belongs_to :project, foreign_key: "projectuser_id"
end

project.rb

has_many :project_relationships, foreign_key: "projectuser_id"
has_many :favorited_by, through: :project_relationships, source: :user

user.rb

has_many :project_relationships, foreign_key: "follower_id"
has_many :followed_projects, through: :project_relationships, source: :project

def following_project?(project)
  project_relationships.find_by_follower_id(project.id)
end

def follow_project!(project)
  project_relationships.create!(projectuser_id: project.id)
end

def project_unfollow!(project)
  project_relationships.find_by_projectuser_id(project.id).destroy
end

project_relationships_controller.rb

class ProjectRelationshipsController < ApplicationController

def create
    @project = Project.find(params[:project_relationship][:projectuser_id])
    current_user.follow_project!(@project)
    redirect_to @project
  end

  def destroy
    @project = ProjectRelationship.find(params[:id]).followed_project
    current_user.project_unfollow!(@project)
    redirect_to @project
  end
end

项目/ show.html.erb

<%= render 'follow_form' if signed_in? %>

项目/ _follow_form.html.erb

<% if current_user.following_project?(@project) %>
    <%= render 'unfollow' %>
<% else %>
    <%= render 'follow' %>
<% end %>

项目/ _follow.html.erb

<%= form_for(current_user.project_relationships.build(projectuser_id: @project.id)) do |f| %>
  <div><%= f.hidden_field :projectuser_id %></div>
  <%= f.submit "Follow", class: "btn btn-large btn-primary" %>
<% end %>

项目/ _unfollow.html.erb

<%= form_for(current_user.project_relationships.find_by_projectuser_id(@project),
         html: { method: :delete }) do |f| %>
  <%= f.submit "Unfollow", class: "btn btn-large" %>
<% end %>

Answer 1

首先 - 如果您在控制台中运行projectfollow!(project)和projectunfollow!(project)（与用户，项目等），它们是否正常运行？

对于您的表单，请尝试以下操作，看看它是否有效：

<%= form_for(current_user.project_relationships.build, url: project_relationships_path(project_id: @project.id)) do |f| %>

然后在你的项目关系控制器中：

class ProjectRelationshipsController < ApplicationController
  def create
    @project = Project.find(params[:project_id])
    current_user.projectfollow!(@project)
    redirect_to @project
  end
end

因此，如果您的创建网址为/project_relationships（通过POST），则上述内容应发布到/project_relationships?project_id=5，然后控制器就可以找到该项目。

此外，尝试重命名您的方法，使它们有意义：

def following_project?(project)
end

def follow_project!(project)
end

def unfollow_project!(project)
end

现在current_user.following_project?(project)很有意义！

更新

好的，我认为以下是问题所在，在create行动中你从params获得了id：

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

但是，在您的表单中，您没有设置隐藏字段的值：

<%= f.hidden_field :projectuser_id %>

将其更改为以下内容并查看其是否有效：

<%= f.hidden_field :projectuser_id, value: @project.id %> # or wherever the id is from

Answer 2

问题是我的关注/取消关注表单嵌入了导致错误的另一种形式。一旦取出，工作！

我的用户为什么不关注/取消关注按钮？

2 个答案:

更新