我如何从数据库中获取价值? [英] How do I get a value from the database?

问题描述

我目前正在使用Ruby on Rails开发Web应用程序.我有一个供工人使用的桌子和一个供职系使用的桌子.将新工作程序添加到系统后，表单如下所示:

I am currently developing a web application using Ruby on Rails. I have a table for workers and a table for grades. When a new worker is added to the system the form looks as follows:

<h1>New worker</h1>

<% form_for(@worker) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
  <p>
    <%= f.label :grade %><br />
    <%= f.text_field :grade %>
  </p>
  <p>
    <%= f.label :remaining_days %><br />
    <%= f.text_field :remaining_days %>
  </p>
  <p>
    <%= f.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', workers_path %>

我的成绩表包含两列，分别是成绩和no_of_days.

添加新工作人员时，我需要根据所选的等级自动添加no_of_days.

My grades table contains two columns which are grade and no_of_days.

When a new worker is being added, I need the no_of_days to be added automatically depending on the grade selected.

推荐答案

很好的参考网址:http://www.troubleshooters.com/codecorn/ruby/database/index.htm [

Nice reference at: http://www.troubleshooters.com/codecorn/ruby/database/index.htm[^]

这篇关于我如何从数据库中获取价值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！