mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-06-04 06:48:27 -04:00
Mike Bayer
d371637af0
within a mapper's deferred load of inherited attributes. - declarative initialization of Columns adjusted so that non-renamed columns initialize in the same way as a non declarative mapper. This allows an inheriting mapper to set up its same-named "id" columns in particular such that the parent "id" column is favored over the child column, reducing database round trips when this value is requested.
306 lines
13 KiB
Python
306 lines
13 KiB
Python
"""tests basic polymorphic mapper loading/saving, minimal relations"""
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import testenv; testenv.configure_for_tests()
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import sets
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from sqlalchemy import *
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from sqlalchemy.orm import *
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from sqlalchemy.orm import exc as orm_exc
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from testlib import *
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from testlib import fixtures
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class Person(fixtures.Base):
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pass
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class Engineer(Person):
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pass
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class Manager(Person):
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pass
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class Boss(Manager):
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pass
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class Company(fixtures.Base):
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pass
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class PolymorphTest(ORMTest):
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def define_tables(self, metadata):
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global companies, people, engineers, managers, boss
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companies = Table('companies', metadata,
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Column('company_id', Integer, primary_key=True, test_needs_autoincrement=True),
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Column('name', String(50)))
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people = Table('people', metadata,
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Column('person_id', Integer, primary_key=True, test_needs_autoincrement=True),
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Column('company_id', Integer, ForeignKey('companies.company_id')),
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Column('name', String(50)),
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Column('type', String(30)))
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engineers = Table('engineers', metadata,
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Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True),
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Column('status', String(30)),
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Column('engineer_name', String(50)),
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Column('primary_language', String(50)),
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)
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managers = Table('managers', metadata,
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Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True),
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Column('status', String(30)),
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Column('manager_name', String(50))
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)
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boss = Table('boss', metadata,
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Column('boss_id', Integer, ForeignKey('managers.person_id'), primary_key=True),
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Column('golf_swing', String(30)),
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)
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metadata.create_all()
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class InsertOrderTest(PolymorphTest):
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def test_insert_order(self):
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"""test that classes of multiple types mix up mapper inserts
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so that insert order of individual tables is maintained"""
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person_join = polymorphic_union(
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{
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'engineer':people.join(engineers),
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'manager':people.join(managers),
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'person':people.select(people.c.type=='person'),
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}, None, 'pjoin')
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person_mapper = mapper(Person, people, select_table=person_join, polymorphic_on=person_join.c.type, polymorphic_identity='person')
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mapper(Engineer, engineers, inherits=person_mapper, polymorphic_identity='engineer')
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mapper(Manager, managers, inherits=person_mapper, polymorphic_identity='manager')
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mapper(Company, companies, properties={
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'employees': relation(Person,
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backref='company',
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order_by=person_join.c.person_id)
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})
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session = create_session()
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c = Company(name='company1')
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c.employees.append(Manager(status='AAB', manager_name='manager1', name='pointy haired boss'))
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c.employees.append(Engineer(status='BBA', engineer_name='engineer1', primary_language='java', name='dilbert'))
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c.employees.append(Person(status='HHH', name='joesmith'))
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c.employees.append(Engineer(status='CGG', engineer_name='engineer2', primary_language='python', name='wally'))
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c.employees.append(Manager(status='ABA', manager_name='manager2', name='jsmith'))
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session.save(c)
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session.flush()
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session.clear()
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self.assertEquals(session.query(Company).get(c.company_id), c)
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class RelationToSubclassTest(PolymorphTest):
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def test_basic(self):
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"""test a relation to an inheriting mapper where the relation is to a subclass
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but the join condition is expressed by the parent table.
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also test that backrefs work in this case.
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this test touches upon a lot of the join/foreign key determination code in properties.py
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and creates the need for properties.py to search for conditions individually within
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the mapper's local table as well as the mapper's 'mapped' table, so that relations
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requiring lots of specificity (like self-referential joins) as well as relations requiring
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more generalization (like the example here) both come up with proper results."""
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mapper(Person, people)
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mapper(Engineer, engineers, inherits=Person)
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mapper(Manager, managers, inherits=Person)
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mapper(Company, companies, properties={
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'managers': relation(Manager, backref="company")
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})
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sess = create_session()
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c = Company(name='company1')
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c.managers.append(Manager(status='AAB', manager_name='manager1', name='pointy haired boss'))
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sess.save(c)
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sess.flush()
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sess.clear()
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self.assertEquals(sess.query(Company).filter_by(company_id=c.company_id).one(), c)
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assert c.managers[0].company is c
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class RoundTripTest(PolymorphTest):
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pass
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def generate_round_trip_test(include_base, lazy_relation, redefine_colprop, with_polymorphic):
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"""generates a round trip test.
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include_base - whether or not to include the base 'person' type in the union.
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lazy_relation - whether or not the Company relation to People is lazy or eager.
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redefine_colprop - if we redefine the 'name' column to be 'people_name' on the base Person class
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use_literal_join - primary join condition is explicitly specified
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"""
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def test_roundtrip(self):
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if with_polymorphic == 'unions':
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if include_base:
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person_join = polymorphic_union(
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{
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'engineer':people.join(engineers),
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'manager':people.join(managers),
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'person':people.select(people.c.type=='person'),
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}, None, 'pjoin')
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else:
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person_join = polymorphic_union(
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{
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'engineer':people.join(engineers),
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'manager':people.join(managers),
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}, None, 'pjoin')
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manager_join = people.join(managers).outerjoin(boss)
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person_with_polymorphic = ['*', person_join]
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manager_with_polymorphic = ['*', manager_join]
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elif with_polymorphic == 'joins':
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person_join = people.outerjoin(engineers).outerjoin(managers).outerjoin(boss)
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manager_join = people.join(managers).outerjoin(boss)
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person_with_polymorphic = ['*', person_join]
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manager_with_polymorphic = ['*', manager_join]
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elif with_polymorphic == 'auto':
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person_with_polymorphic = '*'
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manager_with_polymorphic = '*'
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else:
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person_with_polymorphic = None
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manager_with_polymorphic = None
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if redefine_colprop:
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person_mapper = mapper(Person, people, with_polymorphic=person_with_polymorphic, polymorphic_on=people.c.type, polymorphic_identity='person', properties= {'person_name':people.c.name})
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else:
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person_mapper = mapper(Person, people, with_polymorphic=person_with_polymorphic, polymorphic_on=people.c.type, polymorphic_identity='person')
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mapper(Engineer, engineers, inherits=person_mapper, polymorphic_identity='engineer')
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mapper(Manager, managers, inherits=person_mapper, with_polymorphic=manager_with_polymorphic, polymorphic_identity='manager')
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mapper(Boss, boss, inherits=Manager, polymorphic_identity='boss')
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mapper(Company, companies, properties={
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'employees': relation(Person, lazy=lazy_relation,
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cascade="all, delete-orphan",
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backref="company", order_by=people.c.person_id
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)
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})
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if redefine_colprop:
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person_attribute_name = 'person_name'
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else:
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person_attribute_name = 'name'
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employees = [
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Manager(status='AAB', manager_name='manager1', **{person_attribute_name:'pointy haired boss'}),
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Engineer(status='BBA', engineer_name='engineer1', primary_language='java', **{person_attribute_name:'dilbert'}),
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]
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if include_base:
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employees.append(Person(**{person_attribute_name:'joesmith'}))
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employees += [
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Engineer(status='CGG', engineer_name='engineer2', primary_language='python', **{person_attribute_name:'wally'}),
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Manager(status='ABA', manager_name='manager2', **{person_attribute_name:'jsmith'})
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]
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pointy = employees[0]
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jsmith = employees[-1]
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dilbert = employees[1]
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session = create_session()
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c = Company(name='company1')
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c.employees = employees
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session.save(c)
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session.flush()
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session.clear()
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self.assertEquals(session.query(Person).get(dilbert.person_id), dilbert)
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session.clear()
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self.assertEquals(session.query(Person).filter(Person.person_id==dilbert.person_id).one(), dilbert)
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session.clear()
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def go():
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cc = session.query(Company).get(c.company_id)
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self.assertEquals(cc.employees, employees)
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if not lazy_relation:
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if with_polymorphic != 'none':
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self.assert_sql_count(testing.db, go, 1)
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else:
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self.assert_sql_count(testing.db, go, 5)
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else:
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if with_polymorphic != 'none':
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self.assert_sql_count(testing.db, go, 2)
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else:
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self.assert_sql_count(testing.db, go, 6)
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# test selecting from the query, using the base mapped table (people) as the selection criterion.
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# in the case of the polymorphic Person query, the "people" selectable should be adapted to be "person_join"
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self.assertEquals(
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session.query(Person).filter(getattr(Person, person_attribute_name)=='dilbert').first(),
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dilbert
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)
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assert session.query(Person).filter(getattr(Person, person_attribute_name)=='dilbert').first().person_id
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self.assertEquals(
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session.query(Engineer).filter(getattr(Person, person_attribute_name)=='dilbert').first(),
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dilbert
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)
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# test selecting from the query, joining against an alias of the base "people" table. test that
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# the "palias" alias does *not* get sucked up into the "person_join" conversion.
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palias = people.alias("palias")
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dilbert = session.query(Person).get(dilbert.person_id)
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assert dilbert is session.query(Person).filter((palias.c.name=='dilbert') & (palias.c.person_id==Person.person_id)).first()
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assert dilbert is session.query(Engineer).filter((palias.c.name=='dilbert') & (palias.c.person_id==Person.person_id)).first()
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assert dilbert is session.query(Person).filter((Engineer.engineer_name=="engineer1") & (engineers.c.person_id==people.c.person_id)).first()
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assert dilbert is session.query(Engineer).filter(Engineer.engineer_name=="engineer1")[0]
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dilbert.engineer_name = 'hes dibert!'
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session.flush()
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session.clear()
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def go():
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session.query(Person).filter(getattr(Person, person_attribute_name)=='dilbert').first()
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self.assert_sql_count(testing.db, go, 1)
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session.clear()
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dilbert = session.query(Person).filter(getattr(Person, person_attribute_name)=='dilbert').first()
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def go():
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# assert that only primary table is queried for already-present-in-session
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d = session.query(Person).filter(getattr(Person, person_attribute_name)=='dilbert').first()
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self.assert_sql_count(testing.db, go, 1)
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# test standalone orphans
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daboss = Boss(status='BBB', manager_name='boss', golf_swing='fore', **{person_attribute_name:'daboss'})
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session.save(daboss)
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self.assertRaises(orm_exc.FlushError, session.flush)
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c = session.query(Company).first()
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daboss.company = c
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manager_list = [e for e in c.employees if isinstance(e, Manager)]
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session.flush()
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session.clear()
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self.assertEquals(session.query(Manager).order_by(Manager.person_id).all(), manager_list)
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c = session.query(Company).first()
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session.delete(c)
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session.flush()
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self.assertEquals(people.count().scalar(), 0)
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test_roundtrip = _function_named(
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test_roundtrip, "test_%s%s%s_%s" % (
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(lazy_relation and "lazy" or "eager"),
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(include_base and "_inclbase" or ""),
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(redefine_colprop and "_redefcol" or ""),
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with_polymorphic))
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setattr(RoundTripTest, test_roundtrip.__name__, test_roundtrip)
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for lazy_relation in [True, False]:
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for redefine_colprop in [True, False]:
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for with_polymorphic in ['unions', 'joins', 'auto', 'none']:
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if with_polymorphic == 'unions':
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for include_base in [True, False]:
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generate_round_trip_test(include_base, lazy_relation, redefine_colprop, with_polymorphic)
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else:
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generate_round_trip_test(False, lazy_relation, redefine_colprop, with_polymorphic)
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if __name__ == "__main__":
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testenv.main()
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