Rails：A向上或向下計數器第二部分

Question

基本要點： 我目前正在嘗試創建具有向上或向下功能的計數器計數器。我創建了一個單獨的模型來顯示評分計數器和計數器屬於該帖子。我試圖創造一些沿着Reddit或甚至Stackoverflow的東西。我目前堅持要做什麼。謝謝大家。

DB：評分表：POST_ID，USER_ID，評級

DB：郵政表：RATINGS_COUNT

評級模型的

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 

郵政型號

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

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

評級控制器

Nothing in it 

柱控制器

class PostsController < ApplicationController 

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

    def unrate 

    unsure 

    end 
end 

評級表

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

Answer 1

你可以使用這樣的事情： 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