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from sqlalchemy.ext.declarative import declarative_base
from history_meta import VersionedMeta, VersionedListener
from sqlalchemy import create_engine, Column, Integer, String, ForeignKey
from sqlalchemy.orm import clear_mappers, compile_mappers, sessionmaker, deferred
from sqlalchemy.test.testing import TestBase, eq_
from sqlalchemy.test.entities import ComparableEntity
def setup():
global engine
engine = create_engine('sqlite://', echo=True)
class TestVersioning(TestBase):
def setup(self):
global Base, Session
Base = declarative_base(metaclass=VersionedMeta, bind=engine)
Session = sessionmaker(extension=VersionedListener())
def teardown(self):
clear_mappers()
Base.metadata.drop_all()
def create_tables(self):
Base.metadata.create_all()
def test_plain(self):
class SomeClass(Base, ComparableEntity):
__tablename__ = 'sometable'
id = Column(Integer, primary_key=True)
name = Column(String(50))
self.create_tables()
sess = Session()
sc = SomeClass(name='sc1')
sess.add(sc)
sess.commit()
sc.name = 'sc1modified'
sess.commit()
assert sc.version == 2
SomeClassHistory = SomeClass.__history_mapper__.class_
eq_(
sess.query(SomeClassHistory).filter(SomeClassHistory.version == 1).all(),
[SomeClassHistory(version=1, name='sc1')]
)
sc.name = 'sc1modified2'
eq_(
sess.query(SomeClassHistory).order_by(SomeClassHistory.version).all(),
[
SomeClassHistory(version=1, name='sc1'),
SomeClassHistory(version=2, name='sc1modified')
]
)
assert sc.version == 3
sess.commit()
sc.name = 'temp'
sc.name = 'sc1modified2'
sess.commit()
eq_(
sess.query(SomeClassHistory).order_by(SomeClassHistory.version).all(),
[
SomeClassHistory(version=1, name='sc1'),
SomeClassHistory(version=2, name='sc1modified')
]
)
sess.delete(sc)
sess.commit()
eq_(
sess.query(SomeClassHistory).order_by(SomeClassHistory.version).all(),
[
SomeClassHistory(version=1, name='sc1'),
SomeClassHistory(version=2, name='sc1modified'),
SomeClassHistory(version=3, name='sc1modified2')
]
)
def test_deferred(self):
"""test versioning of unloaded, deferred columns."""
class SomeClass(Base, ComparableEntity):
__tablename__ = 'sometable'
id = Column(Integer, primary_key=True)
name = Column(String(50))
data = deferred(Column(String(25)))
self.create_tables()
sess = Session()
sc = SomeClass(name='sc1', data='somedata')
sess.add(sc)
sess.commit()
sess.close()
sc = sess.query(SomeClass).first()
assert 'data' not in sc.__dict__
sc.name = 'sc1modified'
sess.commit()
assert sc.version == 2
SomeClassHistory = SomeClass.__history_mapper__.class_
eq_(
sess.query(SomeClassHistory).filter(SomeClassHistory.version == 1).all(),
[SomeClassHistory(version=1, name='sc1', data='somedata')]
)
def test_joined_inheritance(self):
class BaseClass(Base, ComparableEntity):
__tablename__ = 'basetable'
id = Column(Integer, primary_key=True)
name = Column(String(50))
type = Column(String(20))
__mapper_args__ = {'polymorphic_on':type, 'polymorphic_identity':'base'}
class SubClassSeparatePk(BaseClass):
__tablename__ = 'subtable1'
id = Column(Integer, primary_key=True)
base_id = Column(Integer, ForeignKey('basetable.id'))
subdata1 = Column(String(50))
__mapper_args__ = {'polymorphic_identity':'sep'}
class SubClassSamePk(BaseClass):
__tablename__ = 'subtable2'
id = Column(Integer, ForeignKey('basetable.id'), primary_key=True)
subdata2 = Column(String(50))
__mapper_args__ = {'polymorphic_identity':'same'}
self.create_tables()
sess = Session()
sep1 = SubClassSeparatePk(name='sep1', subdata1='sep1subdata')
base1 = BaseClass(name='base1')
same1 = SubClassSamePk(name='same1', subdata2='same1subdata')
sess.add_all([sep1, base1, same1])
sess.commit()
base1.name = 'base1mod'
same1.subdata2 = 'same1subdatamod'
sep1.name ='sep1mod'
sess.commit()
BaseClassHistory = BaseClass.__history_mapper__.class_
SubClassSeparatePkHistory = SubClassSeparatePk.__history_mapper__.class_
SubClassSamePkHistory = SubClassSamePk.__history_mapper__.class_
eq_(
sess.query(BaseClassHistory).order_by(BaseClassHistory.id).all(),
[
SubClassSeparatePkHistory(id=1, name=u'sep1', type=u'sep', version=1),
BaseClassHistory(id=2, name=u'base1', type=u'base', version=1),
SubClassSamePkHistory(id=3, name=u'same1', type=u'same', version=1)
]
)
same1.subdata2 = 'same1subdatamod2'
eq_(
sess.query(BaseClassHistory).order_by(BaseClassHistory.id, BaseClassHistory.version).all(),
[
SubClassSeparatePkHistory(id=1, name=u'sep1', type=u'sep', version=1),
BaseClassHistory(id=2, name=u'base1', type=u'base', version=1),
SubClassSamePkHistory(id=3, name=u'same1', type=u'same', version=1),
SubClassSamePkHistory(id=3, name=u'same1', type=u'same', version=2)
]
)
base1.name = 'base1mod2'
eq_(
sess.query(BaseClassHistory).order_by(BaseClassHistory.id, BaseClassHistory.version).all(),
[
SubClassSeparatePkHistory(id=1, name=u'sep1', type=u'sep', version=1),
BaseClassHistory(id=2, name=u'base1', type=u'base', version=1),
BaseClassHistory(id=2, name=u'base1mod', type=u'base', version=2),
SubClassSamePkHistory(id=3, name=u'same1', type=u'same', version=1),
SubClassSamePkHistory(id=3, name=u'same1', type=u'same', version=2)
]
)
def test_single_inheritance(self):
class BaseClass(Base, ComparableEntity):
__tablename__ = 'basetable'
id = Column(Integer, primary_key=True)
name = Column(String(50))
type = Column(String(50))
__mapper_args__ = {'polymorphic_on':type, 'polymorphic_identity':'base'}
class SubClass(BaseClass):
subname = Column(String(50))
__mapper_args__ = {'polymorphic_identity':'sub'}
self.create_tables()
sess = Session()
b1 = BaseClass(name='b1')
sc = SubClass(name='s1', subname='sc1')
sess.add_all([b1, sc])
sess.commit()
b1.name='b1modified'
BaseClassHistory = BaseClass.__history_mapper__.class_
SubClassHistory = SubClass.__history_mapper__.class_
eq_(
sess.query(BaseClassHistory).order_by(BaseClassHistory.id, BaseClassHistory.version).all(),
[BaseClassHistory(id=1, name=u'b1', type=u'base', version=1)]
)
sc.name ='s1modified'
b1.name='b1modified2'
eq_(
sess.query(BaseClassHistory).order_by(BaseClassHistory.id, BaseClassHistory.version).all(),
[
BaseClassHistory(id=1, name=u'b1', type=u'base', version=1),
BaseClassHistory(id=1, name=u'b1modified', type=u'base', version=2),
SubClassHistory(id=2, name=u's1', type=u'sub', version=1)
]
)
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