Ruby on rails can'；t在数据库中插入以下\u id

这是我针对以下用户的简单web应用，它有一个错误，请帮助我：） 我无法将以下\u id插入数据库。我受够了

*这是我的应用程序控制器

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  include WelcomeHelper
end

class RelationController < ApplicationController
  def create
    follow = User.find(params[:relation][:following_id])
    current_user.following << follow
    redirect_to current_user
  end

class WelcomeController < ApplicationController
  def index
  end
 def create
    user = User.find_by_username(params[:session][:username])
      if user
      login user
      redirect_to user
    else
      render 'index'
    end
    end
 def sucess
   @users = User.all
   @relation = Relation.new
 end
end

*关系控制器

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  include WelcomeHelper
end

class RelationController < ApplicationController
  def create
    follow = User.find(params[:relation][:following_id])
    current_user.following << follow
    redirect_to current_user
  end

class WelcomeController < ApplicationController
  def index
  end
 def create
    user = User.find_by_username(params[:session][:username])
      if user
      login user
      redirect_to user
    else
      render 'index'
    end
    end
 def sucess
   @users = User.all
   @relation = Relation.new
 end
end

*成功观

Following
<ul>
  <% current_user.following.each do |u| %>
    <li><%= link_to u.username, u %></li>
  <% end %>
</ul>
Followed By
<ul>
  <% current_user.followers.each do |u| %>
    <li><%= link_to u.username, u %></li>
  <% end %>
</ul>
List Users<br />
<% if !@users.blank? %>
<% for @user in @users %>
<%= @user.username%><br />
    <%= form_for @relation do |f| %>
      <%= f.hidden_field :following_id, :value => @user.id %>
      <%= f.submit "Follow" %>
    <% end %>
<%end%>
<%else%>
<%end%>

---

当我在rails控制台中检查Relation.all时，下面的\u id已经被插入，但是当我检查（作为当前用户帐户）user.following时-我什么也看不到，没有后面的\u id。我认为Relation\u controller在“current\u user.following中出现问题，您需要先清理参数，然后才能将内容放入数据库

---

阅读更多内容

我已经为我的当前用户创建了会话。当我单击“跟随”时，发送的是不同的id，而不是我的当前用户id。我认为这不是一个无关紧要的问题“Rails 4强参数”我不知道如何修复：(

  get "welcome/sucess"
  get "welcome/error"
  root :to => "welcome#index"
  get '/users/:id', :to => 'welcome#sucess', :as => "user"
  match '/relations', to: 'relation#create', via: 'post'

  resources :users
  resources :posts
  resources :relations

  post   'login'   =>  'welcome#create'

Following
<ul>
  <% current_user.following.each do |u| %>
    <li><%= link_to u.username, u %></li>
  <% end %>
</ul>
Followed By
<ul>
  <% current_user.followers.each do |u| %>
    <li><%= link_to u.username, u %></li>
  <% end %>
</ul>
List Users<br />
<% if !@users.blank? %>
<% for @user in @users %>
<%= @user.username%><br />
    <%= form_for @relation do |f| %>
      <%= f.hidden_field :following_id, :value => @user.id %>
      <%= f.submit "Follow" %>
    <% end %>
<%end%>
<%else%>
<%end%>

{"utf8"=>"✓",
 "authenticity_token"=>"NxOq/F5tOuElvhJNLOvkt/25enUN1wDI05I0fKp998Q=",
 "relation"=>{"following_id"=>"11"},
 "commit"=>"Follow"}