ruby-on-rails - 如何计算每条记录在 Rails 中输入了多少个数据库字段

Question

我正在尝试检索数据库完整性的简单统计信息。考虑到未输入的字段中包含“null”或“”，我想知道每条记录填写的字段总数中有多少字段。

以下是现有代码的样子：

<% if @products %>

  <% total_attribute_count = Product.columns.size %>

  <% @products do |product| -%>
    <p><%= platform.name %></p>
    <p>I would like to have here a number of attributes filled in, so I could calculate a percentage based on total_attribute_count</p> 
  <% end -%>

<% end %>

Answer 1

您可以尝试以下

#Following line will gives you total number of columns in the table
a = Product.column_names.length  
#Following line will gives you total number of columns which are filled
b = Product.column_names.map{|a| product.send(a)}.compact.length
#Following line gives you total number of columns which are nil or null
a - b
To calculate % you can do following
(b.to_f*100/a.to_f)

参考column_names