[Modeling-users] Waht about using relations with NOT AUTONUMERIC primary keys?

[Javier C. <jav...@ne...>]

Hi:

  I has a ask for you about Modeling.

  The thing is, i'm accostumed to work with 'system tables' in some ER
models i work...

  These system tables serve for this... 

  Let's say we have a Person, and a Person can have different document
'types'... then , i model this like that..

  PERSON(id, name, fk_idSisDocumentType, documentNumber, ....)

  SisDocumentTypes(id, description)

  Where that 'system table' will have data like those:

  (1, 'DNI')
  (2, 'CUIT')
  (3, 'LE')
  ...

and in person we can have:

  (1, 'Javier', 1, '25.948.547')
  (2, 'Alejandro', 2, '45.456')
  (3, 'Jaime', 3, 'AC-1234')



Well, i want to know if there is some way to model this on Modeling,
cause i saw that each no-abstract entity on Modeling 'must have'
APrimaryKey...

On my example, id on SisDocumentTypes IS A PRIMARY KEY for that
relation... and IS A FOREIGN KEY for PERSON relation... but in modeling,
each PrimaryKey on and Entity in a PyModel, is always a SEQUENCE on the
underlying database? How can i then model that on Modeling? I dont want
that modeling creates an 'automumeric' key on SisDocumentTypes... cause
these values are not inserted by the final user of the system, but yes
by me! That relation is 'initialized' with the allowed values on
deployment of the database, and then it can't be modified by the final
users. Final user just can select those values from a "combobox" on
Person's insert/update form. I hope i'm making me understood, cause
english is not my native language. :)

I though that i could create SisDocumentTypes like that:

model.entities = [ Entity ('SisDocumentTypes',
                        properties = [ AInteger('id'),
                                        AString('description') ]
]



But, then.... id is not primary key, and i can't do a simple Association
with that relation :(

Please, help me!!

Javier A. Castro
Nexion Software
Italia 1508, 1º Piso, Of. 2
CP 8332 - General Roca - Río Negro

www.nexion.com.ar