Ruby on Rails

On 13 July 2016 at 16:14, Johnny Stewart <lists@ruby-forum.com> wrote:
> Colin Law wrote in post #1184575:
>> On 11 July 2016 at 19:41, Johnny Stewart <lists@ruby-forum.com> wrote:
>>> in a table like ChefInfo
>>>
>>> then if user1 is a chef, he would have all the user info + type Chef and
>>> he would have an entry in the chef table
>>>
>>> user2 if she was a footballer would have all the user info + type
>>> Athlete and she would have an entry in the athlete table
>>>
>>> So, you don't need to keep all the chef or athlete data in the user
>>> table - you just have a reference to that info in the relevant table..
>>
>> That does not sound like STI, STI is where you *do* store all the
>> information in one table (Single Table Inheritance), but ignore the
>> irrelevant parts dependent on the type.
>>
>> Colin
>
> As I understand it STI is best suited to situations where the data is
> the same but the behaviour is different. For the User model it really
> only has to handle registrations etc. I don't think there is any need to
> hold data pertaining to that user being a chef.
>
> All it needs is maybe profile name, email address, password etc. That
> needn't change here.
>
> Using STI we store that one extra column of type - then use that to
> see what table that user's extra info is held in (chef_info,
> athlete_info etc).

I do not believe that is the usual use case for STI. See [0] for a
good description of the use of STI.

Colin

[0] http://eewang.github.io/blog/2013/03/12/how-and-when-to-use-single-table-inheritance-in-rails/

Colin

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