Question

在我的应用程序中，我有用户和项目的模型。

我希望用户能够关注许多项目。因此，用户拥有多个项目，而项目属于不仅创建了它们的用户，也是跟随它们的用户。

所以我生成了一个名为ProjectRelationship的迁移，并尝试让它在下面流动，但它似乎不起作用。有人可以帮我修复关联吗？

感谢您的帮助！

project_relationship.rb

class ProjectRelationship < ActiveRecord::Base
  belongs_to :user
  belongs_to :project
end

project.rb

belongs_to :user
has_many :project_relationships
has_many :followers, through: :project_relationships, source: :user

user.rb

has_many :projects
has_many :project_relationships
has_many :projects_followed, through: :project_relationships, source: :project

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"

项目/ show.html.erb

<%= @project.followers.count %>

Answer 1

您需要指定外键。 ProjectRelationship模型将期望相应的表具有＆＃34; user_id＆＃34;和＆＃34; project_id＆＃34;列。但是，您使用了不同的名称。所以要么指定外键：

class ProjectRelationship < ActiveRecord::Base
  belongs_to :user, foreign_key: "follower_id"
  belongs_to :project, foreign_key: "projectuser_id"
end

或更改迁移中的列名称：

create_table :project_relationships do |t|
  t.integer :user_id
  t.integer :project_id
  ...
end

您还需要在其他模型中指定外键：

class Project < ActiveRecord::Base
  belongs_to :user
  has_many :project_relationships, foreign_key: "projectuser_id"
  has_many :followers, through: :project_relationships, source: :user
end

class User < ActiveRecord::Base
  has_many :projects
  has_many :project_relationships, foreign_key: "follower_id"
  has_many :projects_followed, through: :project_relationships, source: :project
end

Answer 2

@ roma149 - 感谢您的回复。我更新了控制器，路线和你说的话。没有错误产生，但是当我点击按钮后面的_follow.html.erb时，它似乎没有跟随项目或更新计数＆＃34; @ project.followers.count＆＃34;

将详细信息移至此处：Why doesn't my user follow/unfollow button work?

跟踪帖子的用户迁移

2 个答案: