Re: Model relations (optional level)

It probably depends why you need this information?  Is the subsidiaries "financial" is unique for company A ?  Or it can be assigned to company A, B and C ?

I mean, would it be

C-A  S-1
C-A  S-2
C-A  S-3
C-B  NULL
C-C  S-4
C-C  S-5 
etc..

or

C-A  S-1
C-A  S-2
C-A  S-3
C-B  NULL
C-C  S-1
C-C  S-2
C-D  S-2
??

I guess it would have to be the 2nd choice..    And if it's the 2nd choice, your user table needs the cie_id (not NULL) and the sub_id which can be NULL.. (or blank)

If it's the 1st option (because you would need the S-id for an employee for the informations on the pay as example), well..  You will only need the id, with one table containing parent_id, id, name where the parent_id will be the company id... with a NULL if its the company.  (Or you can have sub_subsidiaries..

example :

C-A S-1 Room-1
             Room-2
C-A S-2
C-B
B-C S-3
etc..

It's not the easiest on an email.. but well..  Does it make sense?


C


On Monday, February 18, 2013 1:34:31 PM UTC-5, LDSign wrote:

Hi

I am not sure how to give this thread a clear title or topic. But let me explain what I am trying to do (or find the best and "right" practice for this approch).

Think of 3 tables: Users, companies and subsidiaries. Users always belong to a company but they could (!) belong to subsidiary which is itself related to a company.

So there are 2 constellations:

Company -> Users

Company -> Subsidiaries -> Users

The relation between a company and a subsidiary is clear. But what is the best approach for storing the user relation?

Set both company_id + subsidiary_id in the user model although subsidiary_id has already a relation to a company? This could lead into illogical data, if the relation between company and subsidiary has changed.

Or leaving company_id empty in that case and only setting the subsidiary_id? In the other case leave subsidiary_id empty if a user belongs directly to a company.

What do you think?

Thanks,
Frank

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