Ruby on rails 为什么'；我的用户跟随/取消跟随按钮是否工作？

我正在构建一个应用程序（following），用户可以跟踪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\u id和项目的projectuser\u id。外键已按此方式设置

现在，我的

\u follow\u form.html.erb

页面根据当前用户是否跟踪项目呈现“follow”或“unfollow”。请看下面我的代码，看看我遗漏了什么

现在，每个项目显示页面上都会生成follow按钮。但是，当我单击由

\u follow.html.erb

生成的按钮follow按钮时，当我调用

@project.followers.count

时，它似乎没有跟踪项目或更新计数，因为帖子没有发生

因此，当我点击follow按钮时，URL变得混乱不堪。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： 它现在似乎起作用了，但我不确定我是否真的改变了什么，只是通过迁移更改去掉了follower\u id index:unique=>true。

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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

routes.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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

项目关系.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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

user.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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

project\u relationships\u controller.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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

类项目关系控制器

projects/show.html.erb

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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

项目/\u follow\u form.html.erb

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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

projects/\u follow.html.erb

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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

projects/\u unfollow.html.erb

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"

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

class ProjectRelationship < ActiveRecord::Base
   attr_accessible :projectuser_id

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

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

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

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

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

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

<%= 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 %>

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

---

首先-如果您运行

项目，请遵循！（项目）

和

projectunfollow！（项目）

在您的控制台中（与用户、项目等一起），它们是否正常工作

对于您的表单，请尝试以下操作，看看是否有效：

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

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

现在

当前\u用户。跟随\u项目？（项目）

非常有意义

更新 好的，我认为以下是问题所在，在您的

create

操作中，您从参数获取id：

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

但是，在表单中，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，然后查看其是否有效：

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

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

#或id来自何处

问题是我的follow/unfollow表单嵌入了另一个表单，导致了错误。一旦取出，工作

跟踪和取消跟踪查询是否成功创建或销毁？或者只是无法获得相应项目的计数？我相信创建/销毁不起作用，因为当我单击“跟踪”按钮时，数据库中没有为projectrelationship创建任何内容。我看到您的跟踪表单使用js？远程：是的，你介意也发布你的js吗？呃，是的……或者你提交表单时不做任何js？？呃，我看到教程很完整，试着提醒（“测试”）；在create.js.erb和destroy.js.erb中，查看js是否正常工作。我按照您的建议重命名了以下/follow/unfollow方法。我在控制台中运行了这些方法，它在更新数据库时正常工作。然后我更新了projectrelationships控制器_follow.html.erb的表单（请参见下面的响应），但仍然不起作用。单击“follow”按钮时没有进行过账。每次更新都没有修复。我不确定这是否是问题所在，因为如果我将f.hidden_字段更改为f.text_字段，它将创建一个文本字段，该字段将填充：project.id，因为我在之前的构建链接中调用了它。