移民与出勤跟踪应用模型 [英] Migrations & Models in Attendance Tracking Application

问题描述

我想把一个可以跟踪用户出席的应用程序（ruby on rails + mysql）放在一起，但是我正在努力地将数据组织到表中。我会感谢有关可能的表/迁移结构的建议。以下是我到目前为止已经提出的：

出席人士表

  date DATE 
 user_id INT 
 status INT 
  

基本上，我想（非常像出席登记处）标记一个全天/半天或缺席的用户。而且我想能够查看一个用户的考勤记录，变动期（即30天，15天，3天等）。

解决方案

我将使用三种模式：日，用户和记录。

  class Day< ActiveRecord :: Base 
 has_many：records 
 end 
 
 class User< ActiveRecord :: Base 
 has_many：records 
 end 
 
 class Record< ActiveRecord :: Base 
 belongs_to：user 
 belongs_to：day 
 end 
  

Day 显然有一个日期字段，而 Record 将有一个状态字段来保存用户是否存在，当天缺席等等。

这样构造就可以让用户查询，日期（包括范围），状态或三者的任意组合。

例如，计算用户的缺勤值：

  Record.where （：user_id => @ user.id，：status =>'absent'）。count 
  

I want to put together an application (ruby on rails + mysql) that can track "user" attendance, however, I'm struggling with how to organize the data into tables. I'd appreciate suggestions on possible table/migration structures. Following is what I've come up with thus far:

attendance table

date DATE
user_id INT
status INT

Essentially, I want to (much like an attendance register) mark a "user" present for a full-day/half-day or absent. And I'd like to be able to review the attendance record for a user, for a variable period (i.e. past 30 days, 15 days, 3 days, etc.)

Thanks.

解决方案

I would use three models: Day, User, and Record.

class Day < ActiveRecord::Base
  has_many :records
end

class User < ActiveRecord::Base
  has_many :records
end

class Record < ActiveRecord::Base
  belongs_to :user
  belongs_to :day
end

Day would obviously have a date field, and Record would have a status field to hold whether the user was present, absent, etc, on that day.

Structuring it like this allows you to query by user, date (including ranges), status, or any combination of the three.

For example, counting a user's absences:

Record.where(:user_id => @user.id, :status => 'absent').count

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