Question

如何获得有多少用户收藏帖子的百分比？因此80％的用户喜欢第一篇文章。我也在使用名为Markable的宝石。

在我的帖子控制器中，我可以喜欢这样的帖子。

class PostsController < ApplicationController
 def favorite
  @post = Post.friendly.find(params[:id])
  current_user.mark_as_favorite @post
  redirect_to @post
 end
end

我可以看到所有喜欢这样的帖子的用户

@post = Post.first << Test post
@post.users_have_marked_as_favorite << [user1, user2]
@post.users_have_marked_as_favorite.count << 2

以下是我的帖子和用户模型

class Post < ActiveRecord::Base
 extend FriendlyId
 friendly_id :title, use: :slugged
 # the markable_as :favorite is what gives me the option to favorite
 markable_as :favorite
end

class User < ActiveRecord::Base
 acts_as_marker
end

Answer 1

这将计算百分比并将其四舍五入至只有2个十进制数

$ valgrind ./bin/allocate_ptr_in_struct
==23024== Memcheck, a memory error detector
==23024== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==23024== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==23024== Command: ./bin/allocate_ptr_in_struct
==23024==

  Inventory id : 0

    Product[0]
      subproduct[0][0] price : 2
      subproduct[0][1] price : 4

    Product[1]
      subproduct[1][0] price : 4
      subproduct[1][1] price : 8

    Product[2]
      subproduct[2][0] price : 6
      subproduct[2][1] price : 12

  Inventory id : 1

    Product[0]
      subproduct[0][0] price : 2
      subproduct[0][1] price : 4

    Product[1]
      subproduct[1][0] price : 4
      subproduct[1][1] price : 8

    Product[2]
      subproduct[2][0] price : 6
      subproduct[2][1] price : 12
==23024==
==23024== HEAP SUMMARY:
==23024==     in use at exit: 0 bytes in 0 blocks
==23024==   total heap usage: 9 allocs, 9 frees, 128 bytes allocated
==23024==
==23024== All heap blocks were freed -- no leaks are possible
==23024==
==23024== For counts of detected and suppressed errors, rerun with: -v
==23024== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)

如何获得有多少用户收藏帖子的百分比

1 个答案: