Question

我有以下模型和控制器设置：

型号：

class Company < ActiveRecord::Base

  has_many :follow_companies, dependent: :destroy
  has_many :followers, through: :follow_companies, source: :user
end

#join table
class FollowCompany < ActiveRecord::Base

  attr_accessible :company_id

  belongs_to :user
  belongs_to :company
end

class User < ActiveRecord::Base

  #a user can follow many companies
  has_many :follow_companies, dependent: :destroy
  has_many :followed_companies, through: :follow_companies, source: :company
end

控制器：

class FollowCompaniesController < ApplicationController
  def create
    company = Company.find params[:follow_company][:company_id]
    current_user.follow_companies.create! company_id:company.id
    redirect_to company
  end

  def destroy
    company = Company.find params[:id]
    current_user.follow_companies.find_by(company_id: company.id).destroy
    redirect_to company
  end
end

联接表以及公司和用户是一种资源：

resources :users
resources :companies      
resources :follow_companies, only: [:create, :destroy]

现在我想在我的前端设置按钮让用户关注公司假设，他们已经关注该公司：以下视图是Company show action的一部分，而不是FollowCompany show action 视图：

<%= follow_company = current_user.follow_companies.find_by_company_id(@company.id) %>
<%= form_for(follow_company, :html => { :method => :delete }) do |f| %>
    <%= f.submit "Unfollow", class: "btn pull-right" %>
<% end %>

当浏览公司/ show时，我在上面的form_for行中收到错误：

ActionController::RoutingError at /companies/10
No route matches {:action=>"destroy", :controller=>"follow_companies", :format=>nil, :id=>#<FollowCompany user_id: 2, company_id: 10, created_at: "2013-03-21 23:34:36", updated_at: "2013-03-21 23:34:36">}
Request parameters  
{"action"=>"show", "controller"=>"companies", "id"=>"10"}

为什么无法找到路线？

Answer 1

很确定你需要拉：method =＆gt; ：删除html args：

<%= form_for(follow_company, :method => :delete) do |f| %>

不确定这是否是唯一的问题，但这是引起我注意的问题。

这样的东西似乎也更优雅（自动创建表单）：

= button_to "Unfollow", follow_company_path(follow_company), :method => 'delete'

Answer 2

下面是在不编写表单的情况下实现此目的的另一种方法。如果您愿意，可以通过一个链接完成此操作。

<%= link_to "Unfollow", follow_compony_path(follow_company), :method => :delete %>

如何删除两个模型之间的连接表关联？

2 个答案: