Question

我按照托马斯here

发布的第一个答案中的步骤进行操作

我可以进入Heroku控制台并手动用户喜欢的phootos，这样模型设置正确且有效但我最喜欢/不喜欢的链接不起作用。

<p><strong>Picture:</strong></p> 
<%= image_tag(@phooto.picture) %>

<%= link_to("< Previous", @phooto.previous) if @phooto.previous %>
<%= link_to("Next >", @phooto.next) if @phooto.next %>

<% if current_user %>
<%= link_to "favorite",   favorite_phooto_path(@phooto, type: "favorite"), method: :put %>
<%= link_to "unfavorite", favorite_phooto_path(@phooto, type: "unfavorite"), method: :put %>
<% end %>

Heroku Log

Started PUT "/phootos/24/favorite?type=favorite"
Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.6ms)
ActiveRecord::AssociationTypeMismatch (Phooto(#70057240967940) expected, got NilClass(#70057199933300)):
app/controllers/phootos_controller.rb:29:in `favorite

PhootosController

def show
  @phooto = Phooto.find(params[:id])
end

def favorite  
  type = params[:type]
  if type == "favorite"
    **rb.29** current_user.favorites << @phooto
              redirect_to :back, notice: 'You successfully favorited #{@phooto.name}'

  elsif type == "unfavorite"
    current_user.favorites.delete(@phooto)
    redirect_to :back, notice: 'You successfully unfavorited #{@phooto.name}'

  else
    redirect_to :back, notice: 'Nothing happened.'
  end    
end

Phootos / show.html.erb

<p><strong>Picture:</strong></p> 
<%= image_tag(@phooto.picture) %>
<%= link_to("< Previous", @phooto.previous) if @phooto.previous %>
<%= link_to("Next >", @phooto.next) if @phooto.next %>

<% if current_user %>
<%= link_to "favorite",   favorite_phooto_path(@phooto, type: "favorite"), method: :put %>
<%= link_to "unfavorite", favorite_phooto_path(@phooto, type: "unfavorite"), method: :put %>
<% end %>

的routes.rb

resources :users
resources :phootos
resources :phootos do
  put :favorite, on: :member
end

Answer 1

老实说，更好的模式是根据HTTP verb匹配favorite路由：

#config/routes.rb
resources :users
resources :phootos do
   match :favorite, on: :member, via: [:put, :delete]
end

这将取消路径中的type参数（导致问题）：

<% if current_user %>
   <%= link_to "favorite",   favorite_phooto_path(@phooto), method: :put %>
   <%= link_to "unfavorite", favorite_phooto_path(@phooto), method: :delete %>
<% end %>

您必须更改控制器才能处理请求和变量：

def favorite
  @phooto = Phooto.find params[:id]

  if request.put?
      current_user.favorites << @phooto
      redirect_to :back, notice: 'You successfully favorited #{@phooto.name}'
  elsif request.delete?
      current_user.favorites.delete(@phooto)
      redirect_to :back, notice: 'You successfully unfavorited #{@phooto.name}'
  else
      redirect_to :back, notice: 'Nothing happened.'
  end    
end

Answer 2

只需将此行添加为Public Class y Public Class x //class inside of class End Class End Class Public Class Form1 Public Sub Form1_Load(<params>) Handles Me.Load Dim yinst As y = New y() Dim xinst As x = New y.x() MsgBox(yinst.xinst) //instance inside of instance End Sub End Class

中favorite方法的第一行

PhootosController

Rails：最喜欢的模型工作但喜欢/不喜欢的链接不起作用

2 个答案: