sure it's just a setter, it seems like you are passing "start_time_local" to your constructor, the ORM does not automatically add hybrid properties to the constructor so you would need to imlpement the __init__ method manually.
On Fri, Oct 1, 2021, at 5:04 PM, niuji...@gmail.com wrote: > > Hi Mike, > > Instead of this: > > class Entity: > def set_timestamp(self, timestamp, timezone): > # ... > > which you have to manually call it to set, I'd like to have an automated > setting directly on initiation, so that I can create new records in a more > uniformed ways: > Entity(**params_from_web_form) > > > Now I just tried using @hybrid_property.setter: > class Tutorsession(Base): > ... > @start_time_local.setter > def start_time_local(self, value): > timezone_stamp = > json.loads(cherrypy.request.body.read())['timezone_stamp'] > self.start_time = create_timestamp(value, timezone_stamp) > > > > unfortunately it gives me an error: > > TypeError: 'start_time_local' is an invalid keyword argument for Turtorsession > > > > > Is hybrid_property.setter allowed to create new records like this way at all? > On Saturday, September 4, 2021 at 7:43:24 AM UTC-7 Mike Bayer wrote: >> >> >> On Fri, Sep 3, 2021, at 4:07 PM, niuji...@gmail.com wrote: >>> In the official documentation it says: >>> >>> >>> *validates* >>> <https://docs.sqlalchemy.org/en/13/orm/mapped_attributes.html#sqlalchemy.orm.validates>(*names, >>> **kw) >>> >>> >>> Decorate a method as a ‘validator’ for one or more named properties. >>> >>> >>> >>> >>> >>> I need to validate two incoming *-**attributes at the same time, for >>> example: >>> >>> >>> >>> class Entity(Base): >>> >>> .... >>> >>> attr_timezone = Column(String) >>> >>> attr_timestamp = Column(MyTimeStamp) >>> >>> >>> >>> When taking incoming arguments, `attr_timezone` as a string need to be >>> first validated and converted to timezone instance before being attached to >>> my custom class `MyTimeStamp`. Can `validates` do this? >>> >> >> its not a simple yes or no because the use case does not totally make sense. >> >> what happens if someone does this: >> >> some_entity().attr_timestamp = <some timestmap> >> >> and then nothing else? what do you want to happen when that attribute set >> occurs? >> >> >> what you probably want to do is require that one or the other attribute is >> set first. you can certainly use @validates to set this up, it's just an >> event hook. >> >> more realistically though in the most practical sense, you'd want to have a >> method that clearly documents what needs to be done: >> >> class Entity: >> def set_timestamp(self, timestamp, timezone): >> # ... >> >> >> then make "attr_timestamp" and "attr_timezone" private. This is boring >> and not magical but if I were in a large organization where we just need it >> to be clear and unambigious, this is how I'd do it. >> >> >> >> >> >>> >>> >>> -- >>> SQLAlchemy - >>> The Python SQL Toolkit and Object Relational Mapper >>> >>> http://www.sqlalchemy.org/ >>> >>> To post example code, please provide an MCVE: Minimal, Complete, and >>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>> description. >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to sqlalchemy+...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/sqlalchemy/ee2abfce-6a5a-4d43-b508-f86be3ea8cd5n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/sqlalchemy/ee2abfce-6a5a-4d43-b508-f86be3ea8cd5n%40googlegroups.com?utm_medium=email&utm_source=footer>. >> > > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/65671e2f-094a-427a-89a4-2678c9e6125en%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/65671e2f-094a-427a-89a4-2678c9e6125en%40googlegroups.com?utm_medium=email&utm_source=footer>. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/e68e53e4-853c-4c42-9528-d961b10efb21%40www.fastmail.com.
