0

我正在构建一个应用程序（遵循Michael Hartl 的第 11 章），用户可以在其中关注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。外键已经这样设置了。

现在，我的_follow_form.html.erb页面根据是否关注current_user项目呈现“关注”或“取消关注”。请在下面查看我的代码，看看我缺少什么。

现在，在每个项目展示页面上都会生成关注按钮。但是，当我单击由 生成的按钮跟随按钮时_follow.html.erb，它似乎没有跟随项目或在我调用时更新计数，@project.followers.count因为 POST 没有发生。

因此，当我单击关注按钮时，URL 变得混乱。参见示例：

#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

* *更新：它现在似乎可以工作，但我不确定我是否真的改变了任何东西，但通过迁移更改摆脱了 follower_id 索引：unique => true。

架构.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"

路线.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

项目.rb

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

用户.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 %>
4

2 回答 2

0

问题是我的关注/取消关注表单嵌入在另一个导致错误的表单中。取出后，工作！

于 2013-05-02T22:30:49.773 回答
0

首先-如果您运行projectfollow!(project)并projectunfollow!(project)在控制台中（与用户、项目等一起）它们是否正常工作？

对于您的表格，请尝试以下方法，看看它是否有效：

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

然后在您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 URL 是/project_relationships（通过 POST），则上述内容应发布到/project_relationships?project_id=5然后控制器可以找到该项目。

此外，尝试重命名您的方法，使其有意义：

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，在您的create操作中，您从参数中获取了 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，看看它是否有效：

<%= f.hidden_field :projectuser_id, value: @project.id %> # or wherever the id is from
于 2013-04-22T07:52:48.580 回答