Forget the old code. I needed to use make_transient()
This example code work nearly fine (FOREIGN KEY constraints not used in
sqlite)
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import sqlalchemy as sa
import sqlalchemy.ext.declarative as sad
import sqlalchemy.orm as sao
import sqlalchemy.orm.session as sas
from sqlalchemy_utils import create_database
_Base = sad.declarative_base()
class Child(_Base):
__tablename__ = 'Child'
_oid = sa.Column('oid', sa.Integer, primary_key=True)
_name = sa.Column('name', sa.String)
def __init__(self, name):
self._name = name
class Parent(_Base):
__tablename__ = 'Parent'
_oid = sa.Column('oid', sa.Integer, primary_key=True)
_name = sa.Column('name', sa.String)
_child_fk = sa.Column('child', sa.Integer,
sa.ForeignKey('Child.oid')) _child = sao.relationship('Child')
def __init__(self, name):
super(Parent, self).__init__()
self._name = name
pstr = 'postgres://postgres@localhost/Family'
sstr = 'sqlite:///family.db'
pengine = sa.create_engine(pstr, echo = True)
sengine = sa.create_engine(sstr, echo = True)
def createPostgreSQL_Family():
"""Create for PostgreSQL the scheme and the data for testing."""
# create schema
create_database(pengine.url)
_Base.metadata.create_all(pengine)
psession = sao.sessionmaker(bind = pengine)()
# child
c = Child('Jim Bob')
psession.add(c)
psession.commit()
# parent
p = Parent('Mr. Doe')
p._child = c
psession.add(p)
psession.commit()
psession.close()
def convert():
# get one object from the PostgreSQL database
psession = sao.sessionmaker(bind = pengine)()
p = psession.query(Parent).first()
sas.make_transient(p)
#p._oid = None
c = psession.query(Child).first()
sas.make_transient(c)
#c._oid = None
psession.close()
# create and open the SQLite database
create_database(sengine.url)
_Base.metadata.create_all(sengine)
# add/convert the one object to the new database
ssession = sao.sessionmaker(bind = sengine)()
ssession.add(c)
ssession.add(p)
ssession.commit()
if __name__ == '__main__':
#createPostgreSQL_Family()
convert()
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