> > Can we extend by ouselves? > if you subclass a driver you could add your own, but this is very uncommon
I say do not do this because it may break web2py. There are three level: - how data is stored in a field - what kind of data should be in a field - how the data is represented to the user Django mixes them up and has different types of fields for different types of data. Hence occasionally you need to define new fields. Web2py keeps them separate: - how data is stored in a field -> DAP maps into database types (string, text, integer, etc.) - what kind of data should be in a field -> This belongs exclusively to validators - how the data is represented to the user -> db.table.field.widget (for input) and db.table.field.represent (for output) I consider this a strength of web2py. Less magic and easier to extend. If you have a new type (say latitude) you would not make a new field type. You would make a new validator and perhaps a new widget object. Massimo On Feb 2, 1:49 am, Fran <[email protected]> wrote: > On Feb 1, 11:17 pm, Robin B <[email protected]> wrote: > > > On Feb 1, 4:37 pm, BearXu <[email protected]> wrote: > > > 3)In Django table can be inherited like: > > > class *Place*(models.Model): > > > name = models.CharField(max_length=50) > > > class Restaurant(*Place*):---------------------> Can it be done in DAL? > > > serves_hot_dogs = models.BooleanField() > > > serves_pizza = models.BooleanField() > > web2py has a way to do table inheritance. > > For this simple example of extending a base set of fields & adding > extras, yes it can be done as follows: > timestamp=SQLTable(None,'timestamp', > SQLField('created_on','datetime', > readable=False, > writable=False, > default=request.now), > SQLField('modified_on','datetime', > readable=False, > writable=False, > default=request.now,update=request.now)) > > db.define_table('mytable',timestamp, > SQLField('my_extra_field')) > > However this doesn't provide the ability to do a search of all sub- > tables without a JOIN as-per Single-Table > Inheritance:http://groups.google.com/group/web2py/browse_thread/thread/d9715e7b75... > > I have no idea whether the Django version allows that or not... > > F --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py Web Framework" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/web2py?hl=en -~----------~----~----~----~------~----~------~--~---
