Ruby on rails Rails中的自引用关联友好特性

我正在尝试为一个基本的社交网站建立一个简单的交友系统。我只需要我的“Wag”链接就可以触发一个动作，将当前宠物收藏到主人的收藏夹页面。我按照这里的指示来安排一切

这是我正在尝试设置的路径链接

<% @pets.each do |pet| %>
  <div>
   <%= link_to "Wag", owner_friendships_path(friend_id: owner), method: :post %>
  </div>
 <% end %>
</div>

相关架构如下所示：

create_table "friendships", force: true do |t|
 t.integer  "owner_id"
 t.integer  "friend_id"
 t.datetime "created_at"
 t.datetime "updated_at"
end

create_table "owners", force: true do |t|
 t.string   "email",                  default: "", null: false
 t.string   "encrypted_password",     default: "", null: false
 ...(devise defaults)
 t.datetime "created_at"
 t.datetime "updated_at"
 t.string   "profile_photo"
end

我的友谊控制员：

class FriendshipsController < ApplicationController
 def index
  @friendships = Friendship.all
 end

 def show
  @friendship = Friendship.find(params[:id])
 end

def create
 @friendship = current_owner.friendships.build(params[:friend_id])
 if @friendship.save
  flash[:notice] = "Added puppy pal."
  redirect_to root_url
 else
  flash[:error] = "Oops, we couldn't save that puppy pal."
  redirect_to root_url
 end
end

def destroy
  @friendship = current_owner.friendships.find(params[:id])
  @friendship.destroy
  flash[:notice] = "Removed puppy pal."
  redirect_to root_url
 end
end

Class PetsController < ApplicationController

 def index
  @pets = Pet.order("RANDOM()").limit(1)
 end

 def new
  @pet = Pet.new
 end

def create
 @pet = Pet.new(pet_params)
 @pet.owner_id = current_owner.id if current_owner

if @pet.save
  flash[:notice] = 'Your pet profile was saved!'
  redirect_to pets_path
else
  flash.now[:notice] = 'Your pet profile could not be saved.'
  render :new
 end
end

def show
 @pet = Pet.find(params[:id])
end

def edit
 @pet = Pet.find(params[:id])
end

def update
 @pet = Pet.find(params[:id])

 if @pet.update(pet_params)
  redirect_to pets_path
 else
  render :edit
 end
end

def destroy
 @pet = Pet.find(params[:id])

 if current_owner == @pet.owner
  @pet.destroy
  redirect_to pets_path
 end
end

private

def pet_params
 params.require(:pet).permit(:name, :breed, :age,
  :color, :weight, :personality, :favorite_things, :owner_id, :profile_photo)
 end
end

 class OwnersController < ApplicationController
  def show
  @pet = Pet.find(params[:id])
 end

  def edit
   @owner = Owner.find(params[:id])
  end
 end

业主控权人：

class FriendshipsController < ApplicationController
 def index
  @friendships = Friendship.all
 end

 def show
  @friendship = Friendship.find(params[:id])
 end

def create
 @friendship = current_owner.friendships.build(params[:friend_id])
 if @friendship.save
  flash[:notice] = "Added puppy pal."
  redirect_to root_url
 else
  flash[:error] = "Oops, we couldn't save that puppy pal."
  redirect_to root_url
 end
end

def destroy
  @friendship = current_owner.friendships.find(params[:id])
  @friendship.destroy
  flash[:notice] = "Removed puppy pal."
  redirect_to root_url
 end
end

Class PetsController < ApplicationController

 def index
  @pets = Pet.order("RANDOM()").limit(1)
 end

 def new
  @pet = Pet.new
 end

def create
 @pet = Pet.new(pet_params)
 @pet.owner_id = current_owner.id if current_owner

if @pet.save
  flash[:notice] = 'Your pet profile was saved!'
  redirect_to pets_path
else
  flash.now[:notice] = 'Your pet profile could not be saved.'
  render :new
 end
end

def show
 @pet = Pet.find(params[:id])
end

def edit
 @pet = Pet.find(params[:id])
end

def update
 @pet = Pet.find(params[:id])

 if @pet.update(pet_params)
  redirect_to pets_path
 else
  render :edit
 end
end

def destroy
 @pet = Pet.find(params[:id])

 if current_owner == @pet.owner
  @pet.destroy
  redirect_to pets_path
 end
end

private

def pet_params
 params.require(:pet).permit(:name, :breed, :age,
  :color, :weight, :personality, :favorite_things, :owner_id, :profile_photo)
 end
end

 class OwnersController < ApplicationController
  def show
  @pet = Pet.find(params[:id])
 end

  def edit
   @owner = Owner.find(params[:id])
  end
 end

class OwnersController

您需要更改此行：

<%= link_to "Wag", friendships_path(friend_id: owner), method: :post %>

为此：

<%= link_to "Wag", friendships_path(friend_id: pet.owner_id), method: :post %>

---

所有者

从未自行定义。无论您在呼叫什么（我猜它是基于您的db模型的

owner\u id

）需要在块中的

pet

实例上调用

@pets

定义在哪里？更新了我的帖子以包括宠物管理员在这种情况下我的答案是-你应该在块中的

pet

实例上调用

owner\u id

你可以发布你的

pets

表吗？我用宠物更新了表。哦，对不起，我没提到我有一个所有者控制器/模型。基于此，这应该仍然有效。错误来自pets控制器中的索引操作-与所有者控制器Rokay无关，因此在正确的嵌套路由中添加该操作后，从技术上讲，它是所有者友谊路径，而不是友谊路径。有了“pet.owner\u id”，我得到的

没有路由匹配{：action=>“index”，：controller=>“friendships”，：friends\u id=>nil}缺少所需的键：[：owner\u id]

没有该链接，宠物索引在其他情况下工作正常。

pet.owner\u id

是正确的-也许你需要将密钥名-

friend\u id

更改为

owner\u id

将其从friend\u id更改为owner\u id似乎没有什么区别。然而，朋友链接应该在'owners/:id/friendships'处的路径告诉我，nil:NilClass`的

未定义方法

friendships'，所以可能整个问题是它链接到了一个断开的页面？