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from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy import testing
from sqlalchemy.testing.util import function_named
from sqlalchemy.testing import fixtures
from sqlalchemy.testing.schema import Table, Column
class BaseObject(object):
def __init__(self, *args, **kwargs):
for key, value in kwargs.items():
setattr(self, key, value)
class Publication(BaseObject):
pass
class Issue(BaseObject):
pass
class Location(BaseObject):
def __repr__(self):
return "%s(%s, %s)" % (self.__class__.__name__, str(getattr(self, 'issue_id', None)), repr(str(self._name.name)))
def _get_name(self):
return self._name
def _set_name(self, name):
session = create_session()
s = session.query(LocationName).filter(LocationName.name==name).first()
session.expunge_all()
if s is not None:
self._name = s
return
found = False
for i in session.new:
if isinstance(i, LocationName) and i.name == name:
self._name = i
found = True
break
if found == False:
self._name = LocationName(name=name)
name = property(_get_name, _set_name)
class LocationName(BaseObject):
def __repr__(self):
return "%s()" % (self.__class__.__name__)
class PageSize(BaseObject):
def __repr__(self):
return "%s(%sx%s, %s)" % (self.__class__.__name__, self.width, self.height, self.name)
class Magazine(BaseObject):
def __repr__(self):
return "%s(%s, %s)" % (self.__class__.__name__, repr(self.location), repr(self.size))
class Page(BaseObject):
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, str(self.page_no))
class MagazinePage(Page):
def __repr__(self):
return "%s(%s, %s)" % (self.__class__.__name__, str(self.page_no), repr(self.magazine))
class ClassifiedPage(MagazinePage):
pass
class MagazineTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
global publication_table, issue_table, location_table, location_name_table, magazine_table, \
page_table, magazine_page_table, classified_page_table, page_size_table
publication_table = Table('publication', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('name', String(45), default=''),
)
issue_table = Table('issue', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('publication_id', Integer, ForeignKey('publication.id')),
Column('issue', Integer),
)
location_table = Table('location', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('issue_id', Integer, ForeignKey('issue.id')),
Column('ref', CHAR(3), default=''),
Column('location_name_id', Integer, ForeignKey('location_name.id')),
)
location_name_table = Table('location_name', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('name', String(45), default=''),
)
magazine_table = Table('magazine', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('location_id', Integer, ForeignKey('location.id')),
Column('page_size_id', Integer, ForeignKey('page_size.id')),
)
page_table = Table('page', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('page_no', Integer),
Column('type', CHAR(1), default='p'),
)
magazine_page_table = Table('magazine_page', metadata,
Column('page_id', Integer, ForeignKey('page.id'), primary_key=True),
Column('magazine_id', Integer, ForeignKey('magazine.id')),
Column('orders', Text, default=''),
)
classified_page_table = Table('classified_page', metadata,
Column('magazine_page_id', Integer, ForeignKey('magazine_page.page_id'), primary_key=True),
Column('titles', String(45), default=''),
)
page_size_table = Table('page_size', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('width', Integer),
Column('height', Integer),
Column('name', String(45), default=''),
)
def _generate_round_trip_test(use_unions=False, use_joins=False):
def test_roundtrip(self):
publication_mapper = mapper(Publication, publication_table)
issue_mapper = mapper(Issue, issue_table, properties = {
'publication': relationship(Publication, backref=backref('issues', cascade="all, delete-orphan")),
})
location_name_mapper = mapper(LocationName, location_name_table)
location_mapper = mapper(Location, location_table, properties = {
'issue': relationship(Issue, backref=backref('locations', lazy='joined', cascade="all, delete-orphan")),
'_name': relationship(LocationName),
})
page_size_mapper = mapper(PageSize, page_size_table)
magazine_mapper = mapper(Magazine, magazine_table, properties = {
'location': relationship(Location, backref=backref('magazine', uselist=False)),
'size': relationship(PageSize),
})
if use_unions:
page_join = polymorphic_union(
{
'm': page_table.join(magazine_page_table),
'c': page_table.join(magazine_page_table).join(classified_page_table),
'p': page_table.select(page_table.c.type=='p'),
}, None, 'page_join')
page_mapper = mapper(Page, page_table, with_polymorphic=('*', page_join), polymorphic_on=page_join.c.type, polymorphic_identity='p')
elif use_joins:
page_join = page_table.outerjoin(magazine_page_table).outerjoin(classified_page_table)
page_mapper = mapper(Page, page_table, with_polymorphic=('*', page_join), polymorphic_on=page_table.c.type, polymorphic_identity='p')
else:
page_mapper = mapper(Page, page_table, polymorphic_on=page_table.c.type, polymorphic_identity='p')
if use_unions:
magazine_join = polymorphic_union(
{
'm': page_table.join(magazine_page_table),
'c': page_table.join(magazine_page_table).join(classified_page_table),
}, None, 'page_join')
magazine_page_mapper = mapper(MagazinePage, magazine_page_table, with_polymorphic=('*', magazine_join), inherits=page_mapper, polymorphic_identity='m', properties={
'magazine': relationship(Magazine, backref=backref('pages', order_by=magazine_join.c.page_no))
})
elif use_joins:
magazine_join = page_table.join(magazine_page_table).outerjoin(classified_page_table)
magazine_page_mapper = mapper(MagazinePage, magazine_page_table, with_polymorphic=('*', magazine_join), inherits=page_mapper, polymorphic_identity='m', properties={
'magazine': relationship(Magazine, backref=backref('pages', order_by=page_table.c.page_no))
})
else:
magazine_page_mapper = mapper(MagazinePage, magazine_page_table, inherits=page_mapper, polymorphic_identity='m', properties={
'magazine': relationship(Magazine, backref=backref('pages', order_by=page_table.c.page_no))
})
classified_page_mapper = mapper(ClassifiedPage,
classified_page_table,
inherits=magazine_page_mapper,
polymorphic_identity='c',
primary_key=[page_table.c.id])
session = create_session()
pub = Publication(name='Test')
issue = Issue(issue=46,publication=pub)
location = Location(ref='ABC',name='London',issue=issue)
page_size = PageSize(name='A4',width=210,height=297)
magazine = Magazine(location=location,size=page_size)
page = ClassifiedPage(magazine=magazine,page_no=1)
page2 = MagazinePage(magazine=magazine,page_no=2)
page3 = ClassifiedPage(magazine=magazine,page_no=3)
session.add(pub)
session.flush()
print([x for x in session])
session.expunge_all()
session.flush()
session.expunge_all()
p = session.query(Publication).filter(Publication.name=="Test").one()
print(p.issues[0].locations[0].magazine.pages)
print([page, page2, page3])
assert repr(p.issues[0].locations[0].magazine.pages) == repr([page, page2, page3]), repr(p.issues[0].locations[0].magazine.pages)
test_roundtrip = function_named(
test_roundtrip, "test_%s" % (not use_union and (use_joins and "joins" or "select") or "unions"))
setattr(MagazineTest, test_roundtrip.__name__, test_roundtrip)
for (use_union, use_join) in [(True, False), (False, True), (False, False)]:
_generate_round_trip_test(use_union, use_join)
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