如何在Ruby on Rails应用中为公司和人员建模？
[英]How to model Companies and Persons in a Ruby on Rails app?
问题描述
I am new to Rails and I am trying to build an application where one User can have many Organisations which can have many Persons which in turn can have many Projects . 
我是Rails的新手，我正在尝试构建一个应用程序，其中一个用户可以拥有许多组织 ，这些组织可以拥有许多人 ，而这些人又可以拥有许多项目 。
These are my models (does it make sense at all?): 这些是我的模型（完全有意义吗？）：
Users ---< Companies ---< Persons ---< Projects 用户--- <公司--- <人员--- <项目
Now my key question is what will happen if a person does not belong to any company at all? 现在我的关键问题是，如果一个人根本不属于任何公司，将会发生什么？ Will my application still work and will I still be able to access projects, for example like this... 我的应用程序仍然可以运行，并且仍然可以访问项目吗？
current_user.persons.projects
...despite there being no company? ...尽管没有公司？
There is probably a fairly simple way to model these tables in Rails, but for some reason I just can't get my head around this. 在Rails中可能有一种相当简单的方法来对这些表进行建模，但是由于某种原因，我无法解决这个问题。 Thanks for any help. 谢谢你的帮助。
4 个解决方案
解决方案1
1 2012-10-03 19:06:15
Person and Organization is not a hierarchical relationship. 人与组织不是等级关系。 It seems like one, but it isn't. 看起来像一个，但事实并非如此。 It's a graph. 这是一张图。
An organization can have 0+ sub-organizations. 一个组织可以有0个以上的子组织。 It can have 0+ employees over time, and a person can work for more than one organization at the same time. 随着时间的推移，它可以有0+名员工，并且一个人可以同时为多个组织工作。
You can also sell to, or purchase from an individual or an organization, so you must model them as the same super-type. 您还可以向个人或组织出售或购买，因此必须将它们建模为相同的超级类型。
This is called the Party model and I would suggest reading up on it here before you start. 这就是所谓的“聚会模式”，我建议您在开始之前在此进行阅读。
解决方案2
0 2012-10-02 15:12:41
You want to look into using the 您想研究使用
belongs_to and has_many in your models. 您模型中的belongs_to和has_many。
Check out this guide below. 在下面查看此指南。
http://guides.rubyonrails.org/association_basics.html http://guides.rubyonrails.org/association_basics.html
解决方案3
0 已采纳 2012-10-02 15:13:56
With associations you can set up a structure, as posted in the answer by ge0man. 通过关联，您可以建立一个结构，如ge0man在答案中所述。
With validations you can make sure the model has the right properties required before saving / updating. 通过验证，您可以确保模型具有保存/更新之前所需的正确属性。
If you dont and you call a function like User.projects it will just return an empty array, because no project listed to that user were found :) 如果不这样做，则调用User.projects之类的函数，它将仅返回一个空数组，因为未找到该用户列出的项目：）
解决方案4
0 2012-10-02 15:17:42
Now my key question is what will happen if a person does not belong to any company at all?
Answer to your key question is: yes, any user will be able to access projects that belong to people with no company thus: 您的关键问题的答案是：是的，任何用户都可以访问没有公司的人的项目，因此：
Project.all
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