轨道：评级向上或向下计数器第二部分

Question

基本要点： 我目前正在尝试创建一个具有向上或向下功能的评级计数器。我创建了一个单独的模型来显示评级计数器，并且该计数器属于该帖子。我正在尝试创建一些类似于 Reddit 甚至 Stackoverflow 的东西。我目前陷入了该做什么的困境。谢谢大家。

DB：评级表：post_id、user_id、评级

DB：帖子表：评级_count

评级模型

class Rating < ActiveRecord::Base
  attr_accessible :post_id, :user_id, :ratings
  has_many :post
  has_many :users

  validates :post_id, presence: true
  validates :user_id, presence: true
end

帖子模型

class Post < ActiveRecord::Base
  attr_accessible :ratings_count
  belongs_to :user
  has_many :ratings

  validates :user_id, presence: true
  validates :smiles, presence: true
end

评级控制器

Nothing in it

帖子控制器

class PostsController < ApplicationController

  def rate
    @post = post.find(params[:id])
    if params[:ratings_count]
      @[email protected]_count+1
    end
  end

  def unrate

    unsure

  end
end

评级表

<%=form_for @post, :action=>"rate" do |f|%>
<%= f.hidden_field :ratings_count %>
<%=f.submit "Rate"%>
<%end%>

Answer 1

你可以使用这样的东西：
http://ar.rubyonrails.org/classes/ActiveRecord/Base.html#M000348

class PostsController < ApplicationController

  def rate
    Post.increment_counter(:ratings_count, params[:id]) if params[:ratings_count]
  end

  def unrate
    # You will obviously need to check for a ratings_down or something similar field in your form
    Post.decrement_counter(:ratings_count, params[:id]) if params[:ratings_count]
  end
end