我有Questions，可以投票。当我在问题索引中列出每个问题时，我将“是”投票和“否”投票按钮放在每个问题旁边。我正在尝试使用 Ajax 创建投票并呈现更新投票计数的 js 视图。
我正在观察这种行为：投票已成功创建并保存。对每个问题进行的第一次“是”投票会正确调整该问题的计数，但在此之后创建任何“是”投票将不会更新计数，尽管投票对象已保存。“否”按钮永远不会正确更新标签。随机单击“否”按钮会将该问题的 no_vote 计数增加到 80。如果我刷新页面，所有计数都会按预期更新为正确的值。
问题.rb
class Question < ActiveRecord::Base
attr_accessible :body, :title, :pass_percentage
has_many :votes
has_many :yes_votes, class_name: 'Vote', conditions: { is_yes: true }
has_many :no_votes, class_name: 'Vote', conditions: { is_yes: false }
...
end
投票.rb
class Vote < ActiveRecord::Base
attr_accessible :is_yes, :question_id
belongs_to :question
validates :is_yes, inclusion: { in: [true, false]}
validates :question_id, presence: true
end
意见/问题/index.html.erb
...
<%= will_paginate @questions %>
<ul class="questions">
<% @questions.each do |question| %>
<li>
<section class="question_<%= question.id %> clearfix">
<h2><%= link_to question.title, question_path(question) %></h2>
<p><%= truncate(question.body, length: 70) %></p>
<div class="vote-buttons">
<%= render partial: 'shared/yes_vote',
locals: { question: question } %>
<%= render partial: 'shared/no_vote',
locals: { question: question } %>
</div>
</section>
</li>
<% end %>
</ul>
...
_yes_vote.html.erb
<div class="vote-btn yes-vote-btn">
<%= form_for question.votes.build(is_yes: true), remote: true do |f| %>
<%= f.hidden_field :is_yes %>
<%= f.hidden_field :question_id %>
<%= f.submit "Yes", class: "btn btn-large btn-success" %>
<% end %>
<span class="yes-votes-count"><%= question.yes_votes.count %></p>
</div>
_no_vote.html.erb
<div class="vote-btn no-vote-btn">
<%= form_for question.votes.build(is_yes: false), remote: true do |f| %>
<%= f.hidden_field :is_yes %>
<%= f.hidden_field :question_id %>
<%= f.submit "No", class: "btn btn-large btn-danger" %>
<% end %>
<span class="no-votes-count"><%= question.no_votes.count %></span>
</div>
votes_controller.rb
class VotesController < ApplicationController
def new
@vote = Vote.new
end
def create
@vote = Vote.new(params[:vote])
@question = @vote.question
respond_to do |format|
if @vote.save
format.html { redirect_to :back }
format.js
else
format.html { redirect_to :back, flash: { error: "There was an error" } }
format.js
end
end
end
end
questions_controller.rb
class QuestionsController < ApplicationController
def index
@questions = Question.paginate(page: params[:page])
end
...
end
意见/投票/create.js.erb
$(".question_<%= @question.id %> .yes-votes-count").html("<%= @question.yes_votes.count %>")
$(".question_<%= @question.id %> .no-votes-count").html("<%= @question.no_votes.count %>")
服务器日志：
Started POST "/votes" for 127.0.0.1 at 2013-05-17 02:53:38 -0400
Processing by VotesController#create as JS
Parameters: {"utf8"=>"✓", "authenticity_token"=>"QD+7gj3G5r68B7cpxxW5ighB5M0Djluxx5XymnG4vog=", "vote"=>{"is_yes"=>"true", "question_id"=>"2"}, "commit"=>"Yes"}
Question Load (0.1ms) SELECT "questions".* FROM "questions" WHERE "questions"."id" = 2 LIMIT 1
(0.0ms) begin transaction
SQL (0.3ms) INSERT INTO "votes" ("created_at", "is_yes", "question_id", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?) [["created_at", Fri, 17 May 2013 06:53:38 UTC +00:00], ["is_yes", true], ["question_id", 2], ["updated_at", Fri, 17 May 2013 06:53:38 UTC +00:00], ["user_id", nil]]
(0.1ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."question_id" = 2 AND "votes"."is_yes" = 't'
(0.0ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."question_id" = 2
Question Exists (0.0ms) SELECT 1 AS one FROM "questions" WHERE ("questions"."title" = 'Crust or no crust?' AND "questions"."id" != 2) LIMIT 1
(31.9ms) commit transaction
CACHE (0.0ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."question_id" = 2 AND "votes"."is_yes" = 't'
(0.1ms) SELECT COUNT(*) FROM "votes" WHERE "votes"."question_id" = 2 AND "votes"."is_yes" = 'f'
Rendered votes/create.js.erb (1.2ms)
Completed 200 OK in 39ms (Views: 2.3ms | ActiveRecord: 32.6ms)
抱歉，代码量很大。我试图让它尽可能清楚。
为什么这不起作用？有没有更好的方法来编写 create.js.erb 视图？