Question

class FavoritePhoto < ActiveRecord::Base
  belongs_to :user
  belongs_to :photo
  validates :user_id, uniqueness: { 
   scope: [:photo_id],
   message: 'can only favorite an item once'
   }
end

PhotosController
def favorite
  @photo = Photo.find(params[:id])
  if request.put?
    current_user.favorites << @photo
    redirect_to :back, notice: 'You successfully favorited this photo'
  else request.delete?
    current_user.favorites.delete(@photo)
    redirect_to :back, notice: 'You successfully unfavorited this photo'
  end
end

<%= link_to favorite_photo_path("#{photo.id}"), method: :put do %>
  <span class="glyphicon glyphicon-heart"></span>
<% end %>

resources :photos do
  match :favorite, on: :member, via: [:put, :delete]
end

这可以防止用户多次使用同一张照片，并且错误消息“用户只能收藏一次项目”显示在我的Heroku日志中，但是，当他们尝试两次收藏照片时，没有重定向和消息向用户解释发生了什么，它只是在favorite_photo_path（'＃{photo.id}“）超时。

Answer 1

array_values

这是迄今为止我唯一能够工作的人。

Answer 2

我不完全确定最好的方法是在同一个动作中执行删除和更新，但是如果你想这样做，你可以这样做：

User
  has_many :favorite_photos

PhotosController
def favorite
  @photo = Photo.find(params[:id])
  if request.put?
    favorite = current_user.favorite_photos.new(photo: @photo)
    if favorite.save
       redirect_to :back, notice: 'You successfully favorited this photo'
    else
       redirect_to photo_path(@photo), notice: favorite.errors.full_messages
    end
  else request.delete?
    current_user.favorites.delete(@photo)
    redirect_to :back, notice: 'You successfully unfavorited this photo'
  end
end

Answer 3

问题在于，当它们是单独的抽象层时，您依靠ActiveRecord验证来填充您的视图。

您需要包含某种条件逻辑，以确定@photo是否通过了您设置的验证：

#app/controllers/photos_controller.rb
class PhotosController < ApplicationController
  def favorite
    @photo = Photo.find params[:id]

    response = current_user.favorites << @photo if request.put?
    response = current_user.favorites.delete @photo if request.delete?   

    if response.valid? 
      message = response.errors.full_messages.first
    else
      message = request.put? ? "You have successfully favourited this photo" : "You have successfully unfavourited this photo"
    end
    redirect_to @photo, notice: message
  end
end

放置失败后如何重定向并提供错误消息

3 个答案: