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rpuntaie avatar rpuntaie commented on June 11, 2024

I think this is better done on my side:

from sqlalchemy import *
from sqla_wrapper import SQLAlchemy
from sqla_wrapper.model import NameMetaMixin
from sqlalchemy.ext.declarative import DeclarativeMeta

class _NameMetaMixin(NameMetaMixin):
    def __init__(cls, name, bases, dic):
        super().__init__(name,bases,dic)
        cls.__table_args__ = {'extend_existing':True}

class _MetaClass(_NameMetaMixin, DeclarativeMeta):
    pass

_db = SQLAlchemy(metaclass=_MetaClass)
_C = Column

class Model(_db.Model):
    ID = _C(String,primary_key=True,autoincrement=False)
    #other = _C(String)

Then changing fields, e.g. including other, does not produce an error
sqlalchemy.exc.InvalidRequestError: Table 'mymappedclass' is already defined for this MetaData instance. Specify 'extend_existing=True' to redefine options and columns on an existing Table object.

Without sqla-wrapper:

from sqlalchemy.ext.declarative import as_declarative
from sqlalchemy.ext.declarative.api import declared_attr

@as_declarative()
class Base(object):
    @declared_attr
    def __tablename__(cls):
        return cls.__name__.lower()
    @declared_attr
    def __table_args__(cls):
        return {'extend_existing':True}
    ID = C(String,primary_key=True,autoincrement=False)

class MyMappedClass(Base):
    other = C(String)
    #yetother = C(String)

#MyMappedClass.metadata.tables['mymappedclass'].columns

from sqla-wrapper.

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