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from datetime import datetime
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy import testing
from sqlalchemy.testing import fixtures
from sqlalchemy.testing.schema import Table, Column
class InheritTest(fixtures.MappedTest):
"""tests some various inheritance round trips involving a particular set of polymorphic inheritance relationships"""
@classmethod
def define_tables(cls, metadata):
global products_table, specification_table, documents_table
global Product, Detail, Assembly, SpecLine, Document, RasterDocument
products_table = Table('products', metadata,
Column('product_id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('product_type', String(128)),
Column('name', String(128)),
Column('mark', String(128)),
)
specification_table = Table('specification', metadata,
Column('spec_line_id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('master_id', Integer, ForeignKey("products.product_id"),
nullable=True),
Column('slave_id', Integer, ForeignKey("products.product_id"),
nullable=True),
Column('quantity', Float, default=1.),
)
documents_table = Table('documents', metadata,
Column('document_id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('document_type', String(128)),
Column('product_id', Integer, ForeignKey('products.product_id')),
Column('create_date', DateTime, default=lambda:datetime.now()),
Column('last_updated', DateTime, default=lambda:datetime.now(),
onupdate=lambda:datetime.now()),
Column('name', String(128)),
Column('data', LargeBinary),
Column('size', Integer, default=0),
)
class Product(object):
def __init__(self, name, mark=''):
self.name = name
self.mark = mark
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.name)
class Detail(Product):
def __init__(self, name):
self.name = name
class Assembly(Product):
def __repr__(self):
return Product.__repr__(self) + " " + " ".join([x + "=" + repr(getattr(self, x, None)) for x in ['specification', 'documents']])
class SpecLine(object):
def __init__(self, master=None, slave=None, quantity=1):
self.master = master
self.slave = slave
self.quantity = quantity
def __repr__(self):
return '<%s %.01f %s>' % (
self.__class__.__name__,
self.quantity or 0.,
repr(self.slave)
)
class Document(object):
def __init__(self, name, data=None):
self.name = name
self.data = data
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.name)
class RasterDocument(Document):
pass
def test_one(self):
product_mapper = mapper(Product, products_table,
polymorphic_on=products_table.c.product_type,
polymorphic_identity='product')
detail_mapper = mapper(Detail, inherits=product_mapper,
polymorphic_identity='detail')
assembly_mapper = mapper(Assembly, inherits=product_mapper,
polymorphic_identity='assembly')
specification_mapper = mapper(SpecLine, specification_table,
properties=dict(
master=relationship(Assembly,
foreign_keys=[specification_table.c.master_id],
primaryjoin=specification_table.c.master_id==products_table.c.product_id,
lazy='select', backref=backref('specification'),
uselist=False),
slave=relationship(Product,
foreign_keys=[specification_table.c.slave_id],
primaryjoin=specification_table.c.slave_id==products_table.c.product_id,
lazy='select', uselist=False),
quantity=specification_table.c.quantity,
)
)
session = create_session( )
a1 = Assembly(name='a1')
p1 = Product(name='p1')
a1.specification.append(SpecLine(slave=p1))
d1 = Detail(name='d1')
a1.specification.append(SpecLine(slave=d1))
session.add(a1)
orig = repr(a1)
session.flush()
session.expunge_all()
a1 = session.query(Product).filter_by(name='a1').one()
new = repr(a1)
print(orig)
print(new)
assert orig == new == '<Assembly a1> specification=[<SpecLine 1.0 <Product p1>>, <SpecLine 1.0 <Detail d1>>] documents=None'
def test_two(self):
product_mapper = mapper(Product, products_table,
polymorphic_on=products_table.c.product_type,
polymorphic_identity='product')
detail_mapper = mapper(Detail, inherits=product_mapper,
polymorphic_identity='detail')
specification_mapper = mapper(SpecLine, specification_table,
properties=dict(
slave=relationship(Product,
foreign_keys=[specification_table.c.slave_id],
primaryjoin=specification_table.c.slave_id==products_table.c.product_id,
lazy='select', uselist=False),
)
)
session = create_session( )
s = SpecLine(slave=Product(name='p1'))
s2 = SpecLine(slave=Detail(name='d1'))
session.add(s)
session.add(s2)
orig = repr([s, s2])
session.flush()
session.expunge_all()
new = repr(session.query(SpecLine).all())
print(orig)
print(new)
assert orig == new == '[<SpecLine 1.0 <Product p1>>, <SpecLine 1.0 <Detail d1>>]'
def test_three(self):
product_mapper = mapper(Product, products_table,
polymorphic_on=products_table.c.product_type,
polymorphic_identity='product')
detail_mapper = mapper(Detail, inherits=product_mapper,
polymorphic_identity='detail')
assembly_mapper = mapper(Assembly, inherits=product_mapper,
polymorphic_identity='assembly')
specification_mapper = mapper(SpecLine, specification_table,
properties=dict(
master=relationship(Assembly, lazy='joined', uselist=False,
foreign_keys=[specification_table.c.master_id],
primaryjoin=specification_table.c.master_id==products_table.c.product_id,
backref=backref('specification', cascade="all, delete-orphan"),
),
slave=relationship(Product, lazy='joined', uselist=False,
foreign_keys=[specification_table.c.slave_id],
primaryjoin=specification_table.c.slave_id==products_table.c.product_id,
),
quantity=specification_table.c.quantity,
)
)
document_mapper = mapper(Document, documents_table,
polymorphic_on=documents_table.c.document_type,
polymorphic_identity='document',
properties=dict(
name=documents_table.c.name,
data=deferred(documents_table.c.data),
product=relationship(Product, lazy='select', backref=backref('documents', cascade="all, delete-orphan")),
),
)
raster_document_mapper = mapper(RasterDocument, inherits=document_mapper,
polymorphic_identity='raster_document')
session = create_session()
a1 = Assembly(name='a1')
a1.specification.append(SpecLine(slave=Detail(name='d1')))
a1.documents.append(Document('doc1'))
a1.documents.append(RasterDocument('doc2'))
session.add(a1)
orig = repr(a1)
session.flush()
session.expunge_all()
a1 = session.query(Product).filter_by(name='a1').one()
new = repr(a1)
print(orig)
print(new)
assert orig == new == '<Assembly a1> specification=[<SpecLine 1.0 <Detail d1>>] documents=[<Document doc1>, <RasterDocument doc2>]'
def test_four(self):
"""this tests the RasterDocument being attached to the Assembly, but *not* the Document. this means only
a "sub-class" task, i.e. corresponding to an inheriting mapper but not the base mapper, is created. """
product_mapper = mapper(Product, products_table,
polymorphic_on=products_table.c.product_type,
polymorphic_identity='product')
detail_mapper = mapper(Detail, inherits=product_mapper,
polymorphic_identity='detail')
assembly_mapper = mapper(Assembly, inherits=product_mapper,
polymorphic_identity='assembly')
document_mapper = mapper(Document, documents_table,
polymorphic_on=documents_table.c.document_type,
polymorphic_identity='document',
properties=dict(
name=documents_table.c.name,
data=deferred(documents_table.c.data),
product=relationship(Product, lazy='select', backref=backref('documents', cascade="all, delete-orphan")),
),
)
raster_document_mapper = mapper(RasterDocument, inherits=document_mapper,
polymorphic_identity='raster_document')
session = create_session( )
a1 = Assembly(name='a1')
a1.documents.append(RasterDocument('doc2'))
session.add(a1)
orig = repr(a1)
session.flush()
session.expunge_all()
a1 = session.query(Product).filter_by(name='a1').one()
new = repr(a1)
print(orig)
print(new)
assert orig == new == '<Assembly a1> specification=None documents=[<RasterDocument doc2>]'
del a1.documents[0]
session.flush()
session.expunge_all()
a1 = session.query(Product).filter_by(name='a1').one()
assert len(session.query(Document).all()) == 0
def test_five(self):
"""tests the late compilation of mappers"""
specification_mapper = mapper(SpecLine, specification_table,
properties=dict(
master=relationship(Assembly, lazy='joined', uselist=False,
foreign_keys=[specification_table.c.master_id],
primaryjoin=specification_table.c.master_id==products_table.c.product_id,
backref=backref('specification'),
),
slave=relationship(Product, lazy='joined', uselist=False,
foreign_keys=[specification_table.c.slave_id],
primaryjoin=specification_table.c.slave_id==products_table.c.product_id,
),
quantity=specification_table.c.quantity,
)
)
product_mapper = mapper(Product, products_table,
polymorphic_on=products_table.c.product_type,
polymorphic_identity='product', properties={
'documents' : relationship(Document, lazy='select',
backref='product', cascade='all, delete-orphan'),
})
detail_mapper = mapper(Detail, inherits=Product,
polymorphic_identity='detail')
document_mapper = mapper(Document, documents_table,
polymorphic_on=documents_table.c.document_type,
polymorphic_identity='document',
properties=dict(
name=documents_table.c.name,
data=deferred(documents_table.c.data),
),
)
raster_document_mapper = mapper(RasterDocument, inherits=Document,
polymorphic_identity='raster_document')
assembly_mapper = mapper(Assembly, inherits=Product,
polymorphic_identity='assembly')
session = create_session()
a1 = Assembly(name='a1')
a1.specification.append(SpecLine(slave=Detail(name='d1')))
a1.documents.append(Document('doc1'))
a1.documents.append(RasterDocument('doc2'))
session.add(a1)
orig = repr(a1)
session.flush()
session.expunge_all()
a1 = session.query(Product).filter_by(name='a1').one()
new = repr(a1)
print(orig)
print(new)
assert orig == new == '<Assembly a1> specification=[<SpecLine 1.0 <Detail d1>>] documents=[<Document doc1>, <RasterDocument doc2>]'
|
