I'm a noobie trying get primary model's primary UUID automatically instantiated before it's stored into DB, I would not like to commit objects into db just to get the UUID available.
The short snippets below are from the actual code I have.
I think I need to attach initialization into some SQLAlchemy hook, but I don't know which or how.
I have an UUID helper as follows
class GUID(TypeDecorator):
impl = types.LargeBinary
...
the in the tables I use
class Row(Model,Base):
__tablename__ = "Row"
id = Column(GUID(), primary_key=True, default=uuid.uuid4)
row_text = Column(Unicode, index=True)
original_row_index = Column(Integer)
when I do this test:
def test_uuid():
row_text = "Just a plain row."
irow = 0
row = Row(row_text, irow)
row.save()
row.commit()
if row.id == None:
print ("row.id == None")
else:
print ("row.id set")
row2 = Row(row_text, irow)
row2.save()
if row2.id == None:
print ("row2.id == None")
else:
print ("row2.id set")
it prints
row.id set row2.id == None
The Model class I use is as follows:
class Model():
def __init__(self):
pass
def save(self):
db = Db.instance()
db.session.add(self)
def commit(self):
db = Db.instance()
db.session.commit()
