A model represents a single business logic or concept. It contains fields and defines the behaviors of the record. Most of the time, each model stores records in a single database table.
The basics:
- Each model is a Python class that subclasses one of
trytond.model.model.Model.- Fields are defined as model attributes.
- Tryton generates the table definitions
- Tryton provides an API following the active record pattern to access the records.
This example defines a Party model which has a name and a code
fields:
from trytond.model import ModelView, ModelSQL, fields
from trytond.pool import Pool
class Party(ModelSQL, ModelView):
"Party"
__name__ = "party.party"
name = fields.Char('Name')
code = fields.Char('Code')
Pool.register(Party)
The class must be registered in the Pool. Model classes are essentially data mappers to records and Model instances are records.
Model attributes define meta-information of the model. They are class attributes starting with an underscore. Some model properties are instance attributes allowing to update them at other places in the framework.