本文翻译自：Ruby on Rails generates model field:type - what are the options for field:type?
I'm trying to generate a new model and forget the syntax for referencing another model's ID. 我试图生成一个新模型，却忘记了引用另一个模型ID的语法。 I'd look it up myself, but I haven't figured out, among all my Ruby on Rails documentation links, how to find the definitive source. 我自己检查一下，但是在我所有的Ruby on Rails文档链接中，我还没有弄清楚如何找到确定的源。
$ rails g model Item name:string description:text (and here either reference:product or references:product ). $ rails g model Item name:string description:text （此处为reference:product或references:product ）。 But the better question is where or how can I look for this kind of silliness easily in the future? 但是更好的问题是，将来我在哪里或如何轻松地寻找这种愚蠢？
Note: I've learned the hard way that if I mistype one of these options and run my migration then Ruby on Rails will totally screw up my database... and rake db:rollback is powerless against such screwups. 注意：我已经学到了很难的方法，如果我输错了这些选项之一并运行迁移，那么Ruby on Rails将会完全破坏我的数据库...而rake db:rollback则无能为力。 I'm sure I'm just not understanding something, but until I do... the "detailed" information returned by rails g model still leaves me scratching... 我敢肯定我只是不了解一些东西，但是直到我明白了…… rails g model返回的“详细”信息仍然让我抓不住...
参考：https://stackoom.com/question/IOYG/Ruby-on-Rails生成模型field-type-field-type的选项是什么
Remember to not capitalize your text when writing this command. 请记住在编写此命令时不要大写文本。 For example: 例如：
Do write: 写：
rails g model product title:string description:text image_url:string price:decimalDo not write: 不要写：
rails g Model product title:string description:text image_url:string price:decimalAt least it was a problem to me. 至少对我来说这是个问题。
I had the same issue, but my code was a little bit different. 我遇到了同样的问题，但是我的代码有些不同。
def new @project = Project.new end
And my form looked like this: 我的表格如下所示：
<%= form_for @project do |f| %> and so on.... <% end %>
That was totally correct, so I didn't know how to figure it out. 那是完全正确的，所以我不知道如何解决。
Finally, just adding url: { projects: :create } after <%= form-for @project worked for me. 最后，只需在<%= form-for @project后为我工作，然后添加url: { projects: :create } 。
http://guides.rubyonrails.org should be a good site if you're trying to get through the basic stuff in Ruby on Rails. 如果您想了解Ruby on Rails的基本知识，则http://guides.rubyonrails.org应该是一个不错的网站。
Here is a link to associate models while you generate them: http://guides.rubyonrails.org/getting_started.html#associating-models 这是在生成模型时关联模型的链接： http : //guides.rubyonrails.org/getting_started.html#associating-models
See the table definitions section. 请参阅表定义部分。
It's very simple in ROR to create a model that references other. 在ROR中创建引用其他模型很简单。
rails g model Item name:string description:text product:references rails g model项目名称：字符串描述：文本产品：引用
This code will add 'product_id' column in the Item table 此代码将在Item表中添加“ product_id”列
