On Mon, Sep 1, 2008 at 2:50 PM, alex bodnaru <[EMAIL PROTECTED]> wrote:
> i've done a couple of extensions i found useful, and since their
> simplicity i'm sure they might also serve as examples.
>
> all my scarce extensions knowledge comes from analyze of elixir and
> existing extensions, and these help with simplifying my code (without
> giving up functionality) and avoid patching elixir in order to achieve
> some pervert solutions.
>
> please enjoy my work as, we all enjoy the work of others, especially
> in the freeware world.
>
> 1. inverse_orphans:
>
> in persons.py you have
> class Person(Entity):
> id = Field(Integer, pk=True)
> name = Field(Unicode(20))
>
> in books.py you have
> from person import *
> class Book(Entity):
> id = Field(Integer, pk=True)
> name = Field(Unicode(50))
> author = ManyToOne('Person', inverse='books_authored')
>
> inverse_orphans()
>
> since a Person is a quite generic entity, you can't be sure he should
> author books or cut throats or both, but in a suitable application, i
> might ask for the books a person has authored etc. hence, will
> silently add Person a books_authored OneToMany fully functional
> relationship.
IMO, your use case would be better done by using backrefs explicitly:
class Person(Entity):
id = Field(Integer, pk=True)
name = Field(Unicode(20))
in books.py you have
from person import *
class Book(Entity):
id = Field(Integer, pk=True)
name = Field(Unicode(50))
author = ManyToOne('Person', backref='books_authored')
> 2. record_owned
> is an extension made after acts_as_versioned, just that it will add
> the facility of auto recording the person that inserted and updated
> each record in an Entity.
>
> there is also some advance over the versioned extension, in that you
> may also fill manually defined fields, to allow them be part of a
> relationship and/or have additional information.
>
> i will also patch the versioned extension to allow this customization,
> keeping the present functionality as default.
I only realize it now, but what you've done could be achieved much
more simply, by using the "default" and "onupdate" keyword arguments
to fields:
def get_current_user(param=None):
return current_user
class Movie(Entity):
title = Field(Unicode(30))
year = Field(Integer)
record_inserter = Field(Unicode(30), default=get_current_user)
record_updater = Field(Unicode(30), onupdate=get_current_user)
--
Gaëtan de Menten
http://openhex.org
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