Re: [Rails] [Question] Is there any way to define class_name dynamically in has_many relation ?

Ruby on Rails Wednesday, January 22, 2014



On Monday, 20 January 2014 09:43:00 UTC-5, Takashi Nakagawa wrote:
Hi walter, thanks for answering question.

I've read about polymorphic relationships and I've tried it before, but in my case, I should use database which is already used in other project and I make new rails app with the database. so I can' t change database structure easily. 


Are you attempting to make a Rails app that *shares* a DB with another application? In my experience, that's a phenomenally terrible idea - it sounds good at first, but you wind up having a very hard time debugging things or even creating a realistic test environment. If the old application must continue running, is there any way you can set up an "extract" process that copies + reformats data into the Rails app in a saner format?

If you absolutely can't do that, you'll need to be more specific about the problem you're trying to solve. Where is this "dynamic" class name supposed to be coming from?

--Matt Jones

 
2014年1月17日金曜日 23時25分24秒 UTC+9 Walter Lee Davis:
Have you read anything about polymorphic relationships yet? That's a good place to start. Rails Guides, ActiveRecord Relations, read the whole page, but pay attention to the section on Polymorphism.

Walter

On Jan 17, 2014, at 4:55 AM, Takashi Nakagawa wrote:

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Posted by Ruby on Rails at 9:10 AM

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