Users#show中的Mongoid::Errors::暧昧关系

Question

我使用ruby‘2.5.0’、rails‘5.2.2’、mongoid‘7.0.2’并设计

我试图添加follow函数，但我在mongoid‘7.0.2’中出现了这个错误

消息：不明确的关系

@options={：class_name=>"用户"}，@extension=nil，@module_path="，@polymorphil=false，@default_foregin_key_field="follower_id"，@foreign_key="follower_id"，@indexed=false，@class_name="用户"，@klass=用户，@validate=false>，

@options={：class_name=>"用户"}，@extension=nil，@module_path="，@polymorphil=false，@default_foregin_key_field="followed_id"，@foreign_key="followed_id"，@indexed=false，@class_name="用户"，@klass=用户，@validate=false>在Relationship上定义。摘要：何时Mongoid试图在内存中设置一个关系的反向文档，它需要知道它属于哪个关系。设置时：relationships，Mongoid在类User上查找匹配的关系，但发现倍数可能匹配：

@options={：class_name=>"用户"}，@extension=nil，@module_path="，@polymorphil=false，@default_foregin_key_field="follower_id"，@foreign_key="follower_id"，@indexed=false，@class_name="用户"，@klass=用户，@validate=false>，

@options={：class_name=>"用户"}，@extension=nil，@module_path="，@polymorphil=false，@default_foregin_key_field="followed_id"，@foreign_key="followed_id"，@indexed=false，@class_name="用户"，@klass=用户，@validate=false>。决议：关于：关系您必须添加一个：inverse_of选项来指定精确关系：关系。

user.rb

class User
include Mongoid::Document
field :email, type: String, default: ""
has_many :relationships, foreign_key: "follower_id", dependent: :destroy
has_many :reverse_relationships, foreign_key: "followed_id", class_name: "Relationship", dependent: :destroy
def retrieve_users_for_ids(user_ids)
users = []
User.in(id: user_ids).each do |user|
users << user
end
users
end
def followed_users
user_ids = []
relationships.each do |relationship|
user_ids << relationship.followed_id
end
return retrieve_users_for_ids(user_ids)
end
def followers
user_ids = []
reverse_relationships.each do |relationship|
user_ids << relationship.follower_id
end
return retrieve_users_for_ids(user_ids)
end
def following?(other_user)
relationships.where(followed_id: other_user.id).first
end
def follow!(other_user)
relationships.create!(followed_id: other_user.id)
end
def unfollow!(other_user)
relationships.where(followed_id: other_user.id).first.destroy
end
end

_follow.html.erb

<%= form_for(current_user.relationships.build(followed_id: @user.id),
remote: true) do |f| %>
<%= f.hidden_field :followed_id %>
<%= f.submit 'Follow', data: {disable_with: 'Follow...'}, class: 'btn btn-d' %>
<% end %>

Answer 1

找到一个工作解决方案

user.rb

class User
include Mongoid::Document
has_and_belongs_to_many :following, class_name: 'User', inverse_of: :followers
has_and_belongs_to_many :followers, class_name: 'User', inverse_of: :following
def follow(other_user)
self.following << other_user
other_user.followers << self
end
def unfollow(other_user)
self.following.delete(other_user)
other_user.followers.delete(self)
end
def following?(other_user)
self.following.include?(other_user)
end
end

users_controller.rb

class UsersController < ApplicationController
def following
@title = 'Following'
@user = User.find(params[:id])
@users = @user.following.page(params[:page])
render 'show_follow'
end
def followers
@title = 'Followers'
@user = User.find(params[:id])
@users = @user.followers.page(params[:page])
render 'show_follow'
end
end

relationships_controller.rb

class RelationshipsController < ApplicationController
def create
@user = User.find(params[:user_id])
current_user.follow(@user)
respond_to do |format|
format.html { redirect_to @user }
format.js
end
end
def destroy
@user = User.find(params[:user_id])
current_user.unfollow(@user)
respond_to do |format|
format.html { redirect_to @user }
format.js
end
end
end

routes.rb

Rails.application.routes.draw do
resources :users do
member do
get :following, :followers
end
end
post   '/follow/',  to: 'relationships#create'
delete '/unfollow', to: 'relationships#destroy'
end

视图/关系/create.js.erb

$("#follow_form").html("<%= escape_javascript(render('users/unfollow')) %>")
$("#followers").html('<%= @user.followers.count %>')

视图/关系/dedestroy.js.erb

$("#follow_form").html("<%= escape_javascript(render('users/follow')) %>")
$("#followers").html('<%= @user.followers.count %>')

views/users/_follow_form.html.erb

<% unless current_user?(@user) %>
<div id="follow_form">
<% if current_user.following?(@user) %>
<%= render 'unfollow' %>
<% else %>
<%= render 'follow' %>
<% end %>
</div>
<% end %>

views/users/_follow.html.erb

<%= form_tag "/follow", method: :post , remote: true do %>
<%= hidden_field_tag :user_id, @user.id %>
<%= submit_tag "Follow", data: {disable_with: 'Follow...'}, class: "btn btn-d" %>
<% end %>

views/users/_unfollow.html.erb

<%= form_tag "/unfollow", method: :delete , remote: true do %>
<div><%= hidden_field_tag :user_id, @user.id %></div>
<%= submit_tag "Unfollow", data: {disable_with: 'Unfollow...'}, class: "btn btn-d" %>
<% end %>

views/users/show.html.erb

<% if current_user == @user %>
<%= render 'follow_form' %>
<% end %>