Re: [Modeling-users] pymodel implementation [was: install tests on 0.9pre11]

[Sebastien B. <sbi...@us...>]

Mario Ruggier <ma...@ru...> wrote:
> Just looking into the PyModel implementation, and get the following:
>=20
> % mdl_validate_model.py pymodel_StoreEmployees.py
> Serious: couldn't load the model
> exceptions.IndentationError
> expected an indented block (line 231)
>    File "/usr/bin/mdl_validate_model.py", line 118, in main
>      from Modeling import Model
>=20
> This from a CVS installation today, with the only difference being
> the patch applied above (and with all the tests in test/README
> passing OK, except for teh one noted exception earlier).

I do not get this error at all and do not see why it happens. I do not
even understand to what "(line 231)" applies to. Any hint on your side?

> Other quick questions:
>=20
> - in the example pymodel_StoreEmployees.py, what is the
>    component being returned (as in pymodel().component) ?

This is described in the doc. string of Model.loadModel(), this is the
function that searches for the model.

http://modeling.sf.net/API/Modeling-API/public/Modeling.Model-module.html#l=
oadModel

But it is a little bit out of sync, i'll change it: in fact, when it
finds an attribute 'model' in a python module (item 1. in the docstring)
it checks whether this is a PyModel or not.

> - Why did you opt for requiring a model.build() at the end of a pymodel?
>    Could this not have been handled automatically from within Model?

You're absolutely right, loadModel() can build() it automatically.
Enclosed is a patch that enables this --it will be in next version.
I also include here a simpler version of pymodel_StoreEmployees.py

  Thanks for all these comments, that makes things cleaner I think.
=20=20
-- S=E9bastien.

------------------------------------------------------------------------
--- Model.py    24 Jul 2003 11:10:53 -0000      1.10
+++ Model.py    31 Jul 2003 16:55:06 -0000
@@ -165,6 +165,7 @@
             model=3Dmodel()
           import PyModel
           if isinstance(model, PyModel.Model):
+            model.build()
             model=3Dmodel.component
           updateModelWithCFG(model)
           return model
@@ -173,6 +174,7 @@
           pymodel=3Dmodule.pymodel
           if callable(pymodel):
             pymodel=3Dpymodel()
+          pymodel.build()
           updateModelWithCFG(pymodel.component)
           return pymodel.component
------------------------------------------------------------------------
#! /usr/bin/env python
'''
A sample Pythonic OO-RDB Model=20
(re-expressing testPackages/StoreEmployees/model_StoreEmployees.xml) --
A PyModel must define a global variable called 'model', that is of type Mod=
el
'''

from Modeling.PyModel import *

##
# Set preferred defaults for this model (when different from=20
# standard defaults, or if we want to make things explicit)

AFloat.defaults['precision'] =3D 10
AFloat.defaults['scale'] =3D 10
AString.defaults['width'] =3D 30

Association.defaults['delete']=3D['nullify', 'nullify']

Entity.defaults['properties'] =3D [
  APrimaryKey('id', isClassProperty=3D0, isRequired=3D1, doc=3D'Primary key=
!')
]

##

_connDict =3D {'database': 'STORE_EMPLOYEES'}
model =3D Model('StoreEmployees',adaptorName=3D'Postgresql',
              connDict=3D_connDict)
model.doc =3D ' ... '
model.version=3D'0.1'
model.entities =3D [
  #
  Entity('Store',
         properties=3D[ AString('corporateName', isRequired=3D1), ],
         ),
  Entity('Employee',
         properties=3D[ AString('lastName',isRequired=3D1,usedForLocking=3D=
1,
                              width=3D20),
                      AString('firstName', isRequired=3D1, width=3D50,
                              usedForLocking=3D1),
                      ]
         ),
  Entity('SalesClerk', parent=3D'Employee',
         properties=3D[ AString('storeArea', width=3D20) ]
         ),
  Entity('Executive', parent=3D'Employee',
         properties=3D[ AString('officeLocation', width=3D5) ]
         ),
  Entity('Address',
         properties=3D[ AString('street', width=3D80),=20
                      AString('zipCode', width=3D10),=20
                      AString('town'),
                      ]
         ),
  Entity('Mark',
         properties=3D[ AInteger('month', isRequired=3D1),=20
                      AInteger('mark', isRequired=3D1),
                      ]
         ),
  Entity('Holidays',
         properties=3D[ ADateTime('startDate', isRequired=3D1),=20
                      ADateTime('endDate', isRequired=3D1),
                      ]
         ),
  ]
model.associations=3D[
  Association('Mark', 'Executive',
              relations=3D['executive', 'marks'],
              delete=3D['nullify', 'cascade'],
              keys=3D['FK_Executive_id', 'id']),
  Association('Address', 'Employee',
              relations=3D['toEmployee', 'toAddresses'],
              delete=3D['deny', 'cascade'],
              keys=3D['fkEmployeeId', 'id'],
              ),
  Association('Employee', 'Store',
              relations=3D['toStore', 'employees'],
              delete=3D['nullify', 'deny'],
              keys=3D['fkStoreId', 'id']),
  Association('Holidays', 'Employee',
              relations=3D[None, 'holidays'],
              delete=3D[None, 'cascade'],
              keys=3D['fkEmployeeId', 'id']),
  ]