El 15/01/14 23:05, Frédéric Marchal ha escrit:
On Tue, Jan 14, 2014 at 10:54 PM, Sergi Almacellas Abellana
<se...@koolpi.com <mailto:se...@koolpi.com>> wrote:
>Is there a base model that I could inherit from or any other means in
>order
>to add fields, methods, ... to all models at once in a module ?
AFAIK you must inherit models one by one.
We can give more help if you explain your prupose.
Well I can think of many use cases but concretely, I'd like to add one
or more fields to all models actually present and all the one that
will be installed further (hence I was hoping that tryton models were
built out of a "root.model" alterable per database that all other
models would inherit from)
Then I would use one of those added field to "tag" every object of
every models that I want to expose to my host application. It would
also allow me to overload read(), search(), ... on all models in order
to update the domain before calling super() according to an opt-in in
the context. Then I would overload fields_view_get() 's "arch" for all
models in order to "monkey patch" the form views and add the "tag"
field in them.
But I have other use cases, eg : another field would be a json
represented cache of the tagged objects by overloading create() and
write() of all models, allowing one to define a "schema" of the json
cache so it can fetch some relations too, storing it in a json_cache
field or memcached.
Well, you see... that kind of stuff. Having the possibility to
overload the lower level model layer seems a powerful feature to me.
You can really bend the system to your needs and design your
application storage the way you want. I guess you might propose
alternative to each of my use cases but it would be so easy if it just
worked using the traditional inheritance scheme of tryton.
So you may need to monkey patch model, modelstorage or modelsql [1] in
order to achive your needs. But i will prefer you create a class that
inherits from model (Taggable, or JsonCachable) and inherit your modules
from this class. Explicit is better than implicit :)
[1] http://hg.tryton.org/trytond/file/8d3e9acd35b3/trytond/model
--
Sergi Almacellas Abellana
www.koolpi.com
Twitter: @pokoli_srk
