Step 1.安裝 gem

Gemfile

+ gem 'acts_as_votable', '~> 0.10.0'

執(zhí)行bundle install

執(zhí)行rails g acts_as_votable:migration

然后rake db:migrate

Step 2.以購物網(wǎng)站為例：修改 product.rb

app/models/product.rb 

+ acts_as_votable

Step 3.修改 routes.rb

config/routes.rb

  resources :products do
    member do
      post :add_to_cart
      put "like", to: "products#upvote"
    end
  end

Step 4.修改 app/controller/products_controller.rb

app/controllers/products_controller.rb

  before_action :authenticate_user!, only: [:upvote, :downvote]
  ...

  def upvote
    @product = Product.find(params[:id])
    @product.upvote_by current_user
    redirect_to :back
  end

  def downvote
    @product=Product.find(params[:id])
    @product.downvote_by current_user
    redirect_to :back
  end

  ...

Step 5.修改html.erb 文件

#在需要添加點贊功能的頁面加入如下內(nèi)容：
<%= link_to like_product_path(product), method: :put do %>
    <div class="pi-thumbs-up">
        贊（<%= product.get_upvotes.size %>）
    </div>
<% end %>

#在需要添加差評功能的頁面加入如下內(nèi)容：
<%= link_to dislike_product_path(product), method: :put do %>
<div class="pi-thumbs-down">
    踩（<%=product.get_downvotes.size%>）
</div>
#注意：路徑的參數(shù)是選擇@product 還是 product 要根據(jù)具體的頁面來確定。