[英]How to implement voting in Rails?
我在chapter 10
的Michael Hartl
上的RailsTutorial
上,做了一些額外的工作,為每個RailsTutorial
添加了回形針圖像。 當我向Micropost
添加照片時,我稱它為Microphoto
。
現在,我做了以下工作:
正確遷移數據庫
class CreateMicrophotos < ActiveRecord::Migration def change create_table :microphotos do |t| t.string :content t.integer :user_id t.integer :votes_up t.integer :votes_down t.timestamps end add_index :microphotos, [:user_id, :created_at] end end
更改顯微照片模型和控制器
這是我的文件:
用戶模型
class User < ActiveRecord::Base
require "paperclip"
attr_accessible :name, :email, :password, :password_confirmation, :avatar,
:avatar_file_name, :avatar_content_type, :avatar_file_size, :avatar_updated_at
has_secure_password
has_many :microphotos, dependent: :destroy
has_attached_file :avatar, :styles => { :large => "120x120>", :medium => "48x48>", :thumb => "26x26>" }
.
.
.
def feed
Microphoto
end
end
顯微照片模型
class Microphoto < ActiveRecord::Base
attr_accessible :content, :votes_down, :votes_up, :photoclip,
:photoclip_file_name, :photoclip_content_type, :photoclip_file_size, :photoclip_updated_at
belongs_to :user
has_attached_file :photoclip, :styles => { :large => "500x400>", :medium => "100x80>" }
validates :content, presence: true, length: { maximum: 140 }
validates :user_id, presence: true
default_scope order: 'microphotos.created_at DESC'
end
Microphotos控制器
class MicrophotosController < ApplicationController
before_filter :signed_in_user, only: [:create, :destroy]
def index
end
def create
@microphoto = current_user.microphotos.build(params[:microphoto])
if @microphoto.save
flash[:success] = "Your photo has been uploaded successfully!"
redirect_to root_url
else
render 'static_pages/home'
end
end
def destroy
end
end
我希望發生一件事:
登錄的用戶可以從其他用戶投票給Microphotos,但不能投票給其他人
我該怎么辦?
我試圖更改microphotos控制器更改操作。 我知道這可能不是一個真正的問題,但是由於我是Rails的新手,所以我不能這樣做。
[更新1]
我使用anonymousxxx
建議的方法,但最終導致出現此路由錯誤消息:
沒有路線匹配{:controller =>“ microphotos”,:action =>“ vote_up”,:id =>#}
使用命令rake routes
我有這個:
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
sessions POST /sessions(.:format) sessions#create
new_session GET /sessions/new(.:format) sessions#new
session DELETE /sessions/:id(.:format) sessions#destroy
microphotos POST /microphotos(.:format) microphotos#create
microphoto DELETE /microphotos/:id(.:format) microphotos#destroy
root / static_pages#home
signup /signup(.:format) users#new
signin /signin(.:format) sessions#new
signout DELETE /signout(.:format) sessions#destroy
help /help(.:format) static_pages#help
about /about(.:format) static_pages#about
terms /terms(.:format) static_pages#terms
vote_up PUT /vote_up/:id(.:format) microphotos#vote_up
vote_down PUT /vote_down/:id(.:format) microphotos#vote_down
[更新2]
經過他的指示,我得到了這個ArgumentError
:
can't use collection outside resource(s) scope
config/routes.rb:18:in `block (3 levels) in <top (required)>'
config/routes.rb:17:in `block (2 levels) in <top (required)>'
config/routes.rb:16:in `block in <top (required)>'
config/routes.rb:1:in `<top (required)>'
這是routes.rb
16 resources :microphotos do
17 collection do
18 put '/vote_up/:id' => "microphotos#vote_up", :on => collection, :as => :vote_up
19 put '/vote_down/:id' => "microphotos#vote_down", :on => collection, :as => :vote_down
20 end
21 end
您可以使用act_as_votable gem。
安裝gem:
gem 'acts_as_votable', '~> 0.5.0'
bundle
安裝和運行遷移:
rails generate acts_as_votable:migration
bundle exec rake db:migrate
在Microphoto
模型中,您應該具有:
acts_as_votable
完成此操作后,您可以使用以下方法來投票/撤消microphotos
:
@microphoto.liked_by @user1
@microphoto.downvote_from @user2
@microphoto.vote :voter => @user3
@microphoto.vote :voter => @user4, :vote => 'bad'
@microphoto.vote :voter => @user5, :vote => 'like'
考慮一下act_as_rateable gem,它可能比Marek Lipka建議的適合您的特定用例更適合您。
您可以在顯微照片上使用if.. else..
語句。
參見清單10.46 。 將刪除鏈接添加到微博部分。
微型帖子只能由所有者用戶刪除。
<% if current_user?(micropost.user) %>
<%= link_to "delete", micropost, method: :delete,
data: { confirm: "You sure?" },
title: micropost.content %>
<% end %>
示例(未經測試,但希望能對您有所幫助):
# on view (e.g show.html.erb)
<% if signed_in? && current_user.id != feed_item.user_id %>
<%= link_to "vote up", vote_up_microphotos_url(feed_item.id), :method => :put %>
<%= link_to "vote down", vote_down_microphotos_url(feed_item.id), :method => :put %>
<% end %>
# controller
before_filter :signed_in_user, only: [:create, :destroy, :vote_up, :vote_down]
def vote_up
@microphoto = Microphoto.find(params[:id])
@microphoto.update_attribute(:votes_up, @microphoto.votes_up + 1)
redirect_to root_path
end
def vote_down
@microphoto = Microphoto.find(params[:id])
@microphoto.update_attribute(:votes_down, @microphoto.votes_down + 1)
redirect_to root_path
end
# route
resources :microphotos do
collection do
put '/vote_up/:id' => "microphotos#vote_up", :as => :vote_up
put '/vote_down/:id' => "microphotos#vote_down", :as => :vote_down
end
end
如果你想用戶無法在顯微照片多票,你應該有一個單獨的模型microphoto model
的選舉權和vote model
具有與關系microphoto model
,關系是這樣的:
class User < ActiveRecord::Base
has_many :vote_photos
has_many :microphotos
end
class Microphoto < ActiveRecord::Base
has_many :vote_photos
belongs_to :user
end
class VotePhoto < ActiveRecord::Base
belongs_to :microphoto
belongs_to :user
end
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