[英]How to upvote a photo and automatically downvote the other photo?
我有一個競賽模型的顯示視圖,該視圖顯示2張隨機照片:
<% if @contest.photos.size < 2 %>
<p>not enough photos in this contest</p>
<% else %>
<%= link_to (image_tag @random_photo1.image.url(:thumb)), upvote_path(id: @contest.id, photo_id: @random_photo1.id) %>
<%= @random_photo1.score %>
<%= link_to (image_tag @random_photo2.image.url(:thumb)), "#" %>
<%= @random_photo2.score %>
<% end %>
這是我的表演動作:
def show
@contest = Contest.find(params[:id])
@user = current_user
random_two_photos = @contest.photos.limit(2).order("RANDOM()")
@random_photo1 = random_two_photos[0]
@random_photo2 = random_two_photos[1]
end
這是我執行2個操作的路線:
get 'contest/:id/photo/:photo_id' => 'contests#enter_contest', as: :enter_contest
get 'contest/:id/photo/:photo_id' => 'contests#upvote', as: :upvote
如何編寫我的“ upvote”控制器操作,以使我單擊的照片獲得100分,而另一張獲得-100分? 我正在使用postgresql。
我會使用另一條路線:
get 'contests/:id/start' => 'contests#start', as: start_contest
put 'contests/:id/vote' => 'contests#vote', as: vote
然后,在Competitions_controller /開始操作
def start
@contest = Contest.find(params[:id])
random_photos = @contest.photos.limit(2).order("RANDOM()")
@photo1 = random_photos.first
@photo2 = random_photos.last
end
在Competitions_controller /開始動作中
def vote
@contest = Contest.find(params[:id])
@photo1 = Photo.find(params[:up_photo_id])
@photo2 = Photo.find(params[:down_photo_id])
@photo1.upvote # you need to put this method in Photo model
@photo2.downvote # you need to put this method in the Photo model
end
在競賽/開始視圖中:
<%= link_to image_tag(@photo1.image.url(:thumb)), vote_path(id: @contest.id, up_photo_id: @photo1.id, down_photo_id: @photo2.id) %>
和...
<%= link_to image_tag(@photo2.image.url(:thumb)), vote_path(id: @contest.id, up_photo_id: @photo2.id, down_photo_id: @photo1.id) %>
記住:您需要將option
method: :put
傳遞給link_to helper,以便執行PUT而不是GET。
改進
vote_link(contest, up_photo, down_photo)
可避免代碼重復。 photos.limit(2).order("RANDOM()")
。 像: @contest.random_photos(2)
我編寫的代碼未經測試。 但是你明白了...
更新以使用單個顯示動作
您需要定義一條路線
resources :contests, only: [:show]
然后在Competitions_controller / show action中
def show
@contest = Contest.find(params[:id])
if params.has_key? :up_photo_id && params.has_key? :down_photo_id
@photo1 = Photo.find(params[:up_photo_id])
@photo2 = Photo.find(params[:down_photo_id])
@photo1.upvote # you need to put this method in Photo model
@photo2.downvote # you need to put this method in the Photo model
else
random_photos = @contest.photos.limit(2).order("RANDOM()")
@photo1 = random_photos.first
@photo2 = random_photos.last
end
end
在show.html.erb中
<%= link_to image_tag(@photo1.image.url(:thumb)), contest_path(id: @contest.id, up_photo_id: @photo1.id, down_photo_id: @photo2.id) %>
和...
<%= link_to image_tag(@photo2.image.url(:thumb)), contest_path(id: @contest.id, up_photo_id: @photo2.id, down_photo_id: @photo1.id) %>
更新:獲取不同的照片
class Contest < ActiveRecord::Base
def random_photos
self.photos.order("RANDOM()")
end
def two_different_photos
photo1 = random_photos.first
raise 'no photos' unless photo1 # raise an exception or something
photo2 = random_photos.where.not(id: photo1.id).first
raise 'only one photo' unless photo2 # raise an exception or something
[photo1, photo2]
end
end
那么您可以在控制器中使用@contest.two_different_photos
...
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