from sqlalchemy.testing import eq_
from sqlalchemy import *
from sqlalchemy.orm import *

from sqlalchemy import testing
from test.orm import _fixtures
from sqlalchemy.testing import fixtures, AssertsCompiledSQL
from sqlalchemy.testing.schema import Table, Column


class SingleInheritanceTest(testing.AssertsCompiledSQL, fixtures.MappedTest):
    @classmethod
    def define_tables(cls, metadata):
        Table('employees', metadata,
            Column('employee_id', Integer, primary_key=True, test_needs_autoincrement=True),
            Column('name', String(50)),
            Column('manager_data', String(50)),
            Column('engineer_info', String(50)),
            Column('type', String(20)))

        Table('reports', metadata,
              Column('report_id', Integer, primary_key=True, test_needs_autoincrement=True),
              Column('employee_id', ForeignKey('employees.employee_id')),
              Column('name', String(50)),
        )

    @classmethod
    def setup_classes(cls):
        global Employee, Manager, Engineer, JuniorEngineer
        class Employee(cls.Comparable):
            pass
        class Manager(Employee):
            pass
        class Engineer(Employee):
            pass
        class JuniorEngineer(Engineer):
            pass

    @classmethod
    def setup_mappers(cls):
        Employee, Manager, JuniorEngineer, employees, Engineer = (cls.classes.Employee,
                                cls.classes.Manager,
                                cls.classes.JuniorEngineer,
                                cls.tables.employees,
                                cls.classes.Engineer)

        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Manager, inherits=Employee, polymorphic_identity='manager')
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')
        mapper(JuniorEngineer, inherits=Engineer, polymorphic_identity='juniorengineer')

    def test_single_inheritance(self):
        Employee, JuniorEngineer, Manager, Engineer = (self.classes.Employee,
                                self.classes.JuniorEngineer,
                                self.classes.Manager,
                                self.classes.Engineer)


        session = create_session()

        m1 = Manager(name='Tom', manager_data='knows how to manage things')
        e1 = Engineer(name='Kurt', engineer_info='knows how to hack')
        e2 = JuniorEngineer(name='Ed', engineer_info='oh that ed')
        session.add_all([m1, e1, e2])
        session.flush()

        assert session.query(Employee).all() == [m1, e1, e2]
        assert session.query(Engineer).all() == [e1, e2]
        assert session.query(Manager).all() == [m1]
        assert session.query(JuniorEngineer).all() == [e2]

        m1 = session.query(Manager).one()
        session.expire(m1, ['manager_data'])
        eq_(m1.manager_data, "knows how to manage things")

        row = session.query(Engineer.name, Engineer.employee_id).filter(Engineer.name=='Kurt').first()
        assert row.name == 'Kurt'
        assert row.employee_id == e1.employee_id

    def test_multi_qualification(self):
        JuniorEngineer, Manager, Engineer = (self.classes.JuniorEngineer,
                                self.classes.Manager,
                                self.classes.Engineer)

        session = create_session()

        m1 = Manager(name='Tom', manager_data='knows how to manage things')
        e1 = Engineer(name='Kurt', engineer_info='knows how to hack')
        e2 = JuniorEngineer(name='Ed', engineer_info='oh that ed')

        session.add_all([m1, e1, e2])
        session.flush()

        ealias = aliased(Engineer)
        eq_(
            session.query(Manager, ealias).all(),
            [(m1, e1), (m1, e2)]
        )

        eq_(
            session.query(Manager.name).all(),
            [("Tom",)]
        )

        eq_(
            session.query(Manager.name, ealias.name).all(),
            [("Tom", "Kurt"), ("Tom", "Ed")]
        )

        eq_(
            session.query(func.upper(Manager.name), func.upper(ealias.name)).all(),
            [("TOM", "KURT"), ("TOM", "ED")]
        )

        eq_(
            session.query(Manager).add_entity(ealias).all(),
            [(m1, e1), (m1, e2)]
        )

        eq_(
            session.query(Manager.name).add_column(ealias.name).all(),
            [("Tom", "Kurt"), ("Tom", "Ed")]
        )

        # TODO: I think raise error on this for now
        # self.assertEquals(
        #    session.query(Employee.name, Manager.manager_data, Engineer.engineer_info).all(),
        #    []
        # )

    def test_from_self(self):
        Engineer = self.classes.Engineer

        sess = create_session()
        self.assert_compile(sess.query(Engineer).from_self(),
                            'SELECT anon_1.employees_employee_id AS '
                            'anon_1_employees_employee_id, '
                            'anon_1.employees_name AS '
                            'anon_1_employees_name, '
                            'anon_1.employees_manager_data AS '
                            'anon_1_employees_manager_data, '
                            'anon_1.employees_engineer_info AS '
                            'anon_1_employees_engineer_info, '
                            'anon_1.employees_type AS '
                            'anon_1_employees_type FROM (SELECT '
                            'employees.employee_id AS '
                            'employees_employee_id, employees.name AS '
                            'employees_name, employees.manager_data AS '
                            'employees_manager_data, '
                            'employees.engineer_info AS '
                            'employees_engineer_info, employees.type '
                            'AS employees_type FROM employees WHERE '
                            'employees.type IN (:type_1, :type_2)) AS '
                            'anon_1',
                            use_default_dialect=True)

    def test_from_self_count(self):
        Engineer = self.classes.Engineer

        sess = create_session()
        col = func.count(literal_column('*'))
        self.assert_compile(
            sess.query(Engineer.employee_id).from_self(col),
            "SELECT count(*) AS count_1 "
            "FROM (SELECT employees.employee_id AS employees_employee_id "
            "FROM employees "
            "WHERE employees.type IN (:type_1, :type_2)) AS anon_1",
            use_default_dialect=True
        )

    def test_select_from(self):
        Manager, JuniorEngineer, employees, Engineer = (self.classes.Manager,
                                self.classes.JuniorEngineer,
                                self.tables.employees,
                                self.classes.Engineer)

        sess = create_session()
        m1 = Manager(name='Tom', manager_data='data1')
        m2 = Manager(name='Tom2', manager_data='data2')
        e1 = Engineer(name='Kurt', engineer_info='knows how to hack')
        e2 = JuniorEngineer(name='Ed', engineer_info='oh that ed')
        sess.add_all([m1, m2, e1, e2])
        sess.flush()

        eq_(
            sess.query(Manager).select_from(employees.select().limit(10)).all(),
            [m1, m2]
        )

    def test_count(self):
        Employee, JuniorEngineer, Manager, Engineer = (self.classes.Employee,
                                self.classes.JuniorEngineer,
                                self.classes.Manager,
                                self.classes.Engineer)

        sess = create_session()
        m1 = Manager(name='Tom', manager_data='data1')
        m2 = Manager(name='Tom2', manager_data='data2')
        e1 = Engineer(name='Kurt', engineer_info='data3')
        e2 = JuniorEngineer(name='marvin', engineer_info='data4')
        sess.add_all([m1, m2, e1, e2])
        sess.flush()

        eq_(sess.query(Manager).count(), 2)
        eq_(sess.query(Engineer).count(), 2)
        eq_(sess.query(Employee).count(), 4)

        eq_(sess.query(Manager).filter(Manager.name.like('%m%')).count(), 2)
        eq_(sess.query(Employee).filter(Employee.name.like('%m%')).count(), 3)

    def test_type_filtering(self):
        Employee, Manager, reports, Engineer = (self.classes.Employee,
                                self.classes.Manager,
                                self.tables.reports,
                                self.classes.Engineer)

        class Report(fixtures.ComparableEntity):
            pass

        mapper(Report, reports, properties={
            'employee': relationship(Employee, backref='reports')})
        sess = create_session()

        m1 = Manager(name='Tom', manager_data='data1')
        r1 = Report(employee=m1)
        sess.add_all([m1, r1])
        sess.flush()
        rq = sess.query(Report)

        assert len(rq.filter(Report.employee.of_type(Manager).has()).all()) == 1
        assert len(rq.filter(Report.employee.of_type(Engineer).has()).all()) == 0

    def test_type_joins(self):
        Employee, Manager, reports, Engineer = (self.classes.Employee,
                                self.classes.Manager,
                                self.tables.reports,
                                self.classes.Engineer)

        class Report(fixtures.ComparableEntity):
            pass

        mapper(Report, reports, properties={
            'employee': relationship(Employee, backref='reports')})
        sess = create_session()

        m1 = Manager(name='Tom', manager_data='data1')
        r1 = Report(employee=m1)
        sess.add_all([m1, r1])
        sess.flush()

        rq = sess.query(Report)

        assert len(rq.join(Report.employee.of_type(Manager)).all()) == 1
        assert len(rq.join(Report.employee.of_type(Engineer)).all()) == 0

class RelationshipFromSingleTest(testing.AssertsCompiledSQL, fixtures.MappedTest):
    @classmethod
    def define_tables(cls, metadata):
        Table('employee', metadata,
            Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
            Column('name', String(50)),
            Column('type', String(20)),
        )

        Table('employee_stuff', metadata,
            Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
            Column('employee_id', Integer, ForeignKey('employee.id')),
            Column('name', String(50)),
        )

    @classmethod
    def setup_classes(cls):
        class Employee(cls.Comparable):
            pass
        class Manager(Employee):
            pass
        class Stuff(cls.Comparable):
            pass

    def test_subquery_load(self):
        employee, employee_stuff, Employee, Stuff, Manager = (self.tables.employee,
                                self.tables.employee_stuff,
                                self.classes.Employee,
                                self.classes.Stuff,
                                self.classes.Manager)

        mapper(Employee, employee, polymorphic_on=employee.c.type, polymorphic_identity='employee')
        mapper(Manager, inherits=Employee, polymorphic_identity='manager', properties={
            'stuff':relationship(Stuff)
        })
        mapper(Stuff, employee_stuff)

        sess = create_session()
        context = sess.query(Manager).options(subqueryload('stuff'))._compile_context()
        subq = context.attributes[('subquery',
                (class_mapper(Manager), class_mapper(Manager).attrs.stuff))]

        self.assert_compile(subq,
                            'SELECT employee_stuff.id AS '
                            'employee_stuff_id, employee_stuff.employee'
                            '_id AS employee_stuff_employee_id, '
                            'employee_stuff.name AS '
                            'employee_stuff_name, anon_1.employee_id '
                            'AS anon_1_employee_id FROM (SELECT '
                            'employee.id AS employee_id FROM employee '
                            'WHERE employee.type IN (:type_1)) AS anon_1 '
                            'JOIN employee_stuff ON anon_1.employee_id '
                            '= employee_stuff.employee_id ORDER BY '
                            'anon_1.employee_id',
                            use_default_dialect=True
                            )

class RelationshipToSingleTest(testing.AssertsCompiledSQL, fixtures.MappedTest):
    __dialect__ = 'default'

    @classmethod
    def define_tables(cls, metadata):
        Table('employees', metadata,
            Column('employee_id', Integer, primary_key=True, test_needs_autoincrement=True),
            Column('name', String(50)),
            Column('manager_data', String(50)),
            Column('engineer_info', String(50)),
            Column('type', String(20)),
            Column('company_id', Integer, ForeignKey('companies.company_id'))
        )

        Table('companies', metadata,
            Column('company_id', Integer, primary_key=True, test_needs_autoincrement=True),
            Column('name', String(50)),
        )

    @classmethod
    def setup_classes(cls):
        class Company(cls.Comparable):
            pass

        class Employee(cls.Comparable):
            pass
        class Manager(Employee):
            pass
        class Engineer(Employee):
            pass
        class JuniorEngineer(Engineer):
            pass

    def test_of_type(self):
        JuniorEngineer, Company, companies, Manager,\
                Employee, employees, Engineer = (self.classes.JuniorEngineer,
                                self.classes.Company,
                                self.tables.companies,
                                self.classes.Manager,
                                self.classes.Employee,
                                self.tables.employees,
                                self.classes.Engineer)

        mapper(Company, companies, properties={
            'employees':relationship(Employee, backref='company')
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Manager, inherits=Employee, polymorphic_identity='manager')
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')
        mapper(JuniorEngineer, inherits=Engineer, polymorphic_identity='juniorengineer')
        sess = sessionmaker()()

        c1 = Company(name='c1')
        c2 = Company(name='c2')

        m1 = Manager(name='Tom', manager_data='data1', company=c1)
        m2 = Manager(name='Tom2', manager_data='data2', company=c2)
        e1 = Engineer(name='Kurt', engineer_info='knows how to hack', company=c2)
        e2 = JuniorEngineer(name='Ed', engineer_info='oh that ed', company=c1)
        sess.add_all([c1, c2, m1, m2, e1, e2])
        sess.commit()
        sess.expunge_all()
        eq_(
            sess.query(Company).filter(Company.employees.of_type(JuniorEngineer).any()).all(),
            [
                Company(name='c1'),
            ]
        )

        eq_(
            sess.query(Company).join(Company.employees.of_type(JuniorEngineer)).all(),
            [
                Company(name='c1'),
            ]
        )

    def test_of_type_aliased_fromjoinpoint(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'employee':relationship(Employee)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        sess = create_session()
        self.assert_compile(
            sess.query(Company).outerjoin(
                Company.employee.of_type(Engineer),
                aliased=True, from_joinpoint=True),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name FROM companies "
            "LEFT OUTER JOIN employees AS employees_1 ON "
            "companies.company_id = employees_1.company_id "
            "AND employees_1.type IN (:type_1)"
        )

    def test_join_explicit_onclause_no_discriminator(self):
        # test issue #3462
        Company, Employee, Engineer = (
            self.classes.Company,
            self.classes.Employee,
            self.classes.Engineer)
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'employees': relationship(Employee)
        })
        mapper(Employee, employees)
        mapper(Engineer, inherits=Employee)

        sess = create_session()
        self.assert_compile(
            sess.query(Company, Engineer.name).join(
                Engineer, Company.company_id == Engineer.company_id),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, "
            "employees.name AS employees_name "
            "FROM companies JOIN "
            "employees ON companies.company_id = employees.company_id"
        )

    def test_outer_join_prop(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        sess = create_session()
        self.assert_compile(
            sess.query(Company, Engineer.name).outerjoin("engineers"),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, employees.name AS employees_name "
            "FROM companies LEFT OUTER JOIN employees ON companies.company_id "
            "= employees.company_id AND employees.type IN (:type_1)"
        )

    def test_outer_join_prop_alias(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        eng_alias = aliased(Engineer)
        sess = create_session()
        self.assert_compile(
            sess.query(Company, eng_alias.name).outerjoin(eng_alias, Company.engineers),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, employees_1.name AS "
            "employees_1_name FROM companies LEFT OUTER "
            "JOIN employees AS employees_1 ON companies.company_id "
            "= employees_1.company_id AND employees_1.type IN (:type_1)"
        )


    def test_outer_join_literal_onclause(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        sess = create_session()
        self.assert_compile(
            sess.query(Company, Engineer).outerjoin(
                Engineer, Company.company_id == Engineer.company_id),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, "
            "employees.employee_id AS employees_employee_id, "
            "employees.name AS employees_name, "
            "employees.manager_data AS employees_manager_data, "
            "employees.engineer_info AS employees_engineer_info, "
            "employees.type AS employees_type, "
            "employees.company_id AS employees_company_id FROM companies "
            "LEFT OUTER JOIN employees ON "
            "companies.company_id = employees.company_id "
            "AND employees.type IN (:type_1)"
        )

    def test_outer_join_literal_onclause_alias(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        eng_alias = aliased(Engineer)
        sess = create_session()
        self.assert_compile(
            sess.query(Company, eng_alias).outerjoin(
                eng_alias, Company.company_id == eng_alias.company_id),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, "
            "employees_1.employee_id AS employees_1_employee_id, "
            "employees_1.name AS employees_1_name, "
            "employees_1.manager_data AS employees_1_manager_data, "
            "employees_1.engineer_info AS employees_1_engineer_info, "
            "employees_1.type AS employees_1_type, "
            "employees_1.company_id AS employees_1_company_id "
            "FROM companies LEFT OUTER JOIN employees AS employees_1 ON "
            "companies.company_id = employees_1.company_id "
            "AND employees_1.type IN (:type_1)"
        )

    def test_outer_join_no_onclause(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        sess = create_session()
        self.assert_compile(
            sess.query(Company, Engineer).outerjoin(
                Engineer),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, "
            "employees.employee_id AS employees_employee_id, "
            "employees.name AS employees_name, "
            "employees.manager_data AS employees_manager_data, "
            "employees.engineer_info AS employees_engineer_info, "
            "employees.type AS employees_type, "
            "employees.company_id AS employees_company_id "
            "FROM companies LEFT OUTER JOIN employees ON "
            "companies.company_id = employees.company_id "
            "AND employees.type IN (:type_1)"
        )

    def test_outer_join_no_onclause_alias(self):
        Company, Employee, Engineer = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer
        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')

        eng_alias = aliased(Engineer)
        sess = create_session()
        self.assert_compile(
            sess.query(Company, eng_alias).outerjoin(
                eng_alias),
            "SELECT companies.company_id AS companies_company_id, "
            "companies.name AS companies_name, "
            "employees_1.employee_id AS employees_1_employee_id, "
            "employees_1.name AS employees_1_name, "
            "employees_1.manager_data AS employees_1_manager_data, "
            "employees_1.engineer_info AS employees_1_engineer_info, "
            "employees_1.type AS employees_1_type, "
            "employees_1.company_id AS employees_1_company_id "
            "FROM companies LEFT OUTER JOIN employees AS employees_1 ON "
            "companies.company_id = employees_1.company_id "
            "AND employees_1.type IN (:type_1)"
        )

    def test_no_aliasing_from_overlap(self):
        # test [ticket:3233]

        Company, Employee, Engineer, Manager = self.classes.Company,\
                                self.classes.Employee,\
                                self.classes.Engineer,\
                                self.classes.Manager

        companies, employees = self.tables.companies, self.tables.employees

        mapper(Company, companies, properties={
            'employees': relationship(Employee, backref="company")
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type)
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')
        mapper(Manager, inherits=Employee, polymorphic_identity='manager')

        s = create_session()

        q1 = s.query(Engineer).\
            join(Engineer.company).\
            join(Manager, Company.employees)

        q2 = s.query(Engineer).\
            join(Engineer.company).\
            join(Manager, Company.company_id == Manager.company_id)

        q3 = s.query(Engineer).\
            join(Engineer.company).\
            join(Manager, Company.employees.of_type(Manager))

        q4 = s.query(Engineer).\
            join(Company, Company.company_id == Engineer.company_id).\
            join(Manager, Company.employees.of_type(Manager))

        q5 = s.query(Engineer).\
            join(Company, Company.company_id == Engineer.company_id).\
            join(Manager, Company.company_id == Manager.company_id)

        # note that the query is incorrect SQL; we JOIN to
        # employees twice.   However, this is what's expected so we seek
        # to be consistent; previously, aliasing would sneak in due to the
        # nature of the "left" side.
        for q in [q1, q2, q3, q4, q5]:
            self.assert_compile(
                q,
                "SELECT employees.employee_id AS employees_employee_id, "
                "employees.name AS employees_name, "
                "employees.manager_data AS employees_manager_data, "
                "employees.engineer_info AS employees_engineer_info, "
                "employees.type AS employees_type, "
                "employees.company_id AS employees_company_id "
                "FROM employees JOIN companies "
                "ON companies.company_id = employees.company_id "
                "JOIN employees "
                "ON companies.company_id = employees.company_id "
                "AND employees.type IN (:type_1) "
                "WHERE employees.type IN (:type_2)"
            )

    def test_relationship_to_subclass(self):
        JuniorEngineer, Company, companies, Manager, \
                    Employee, employees, Engineer = (self.classes.JuniorEngineer,
                                self.classes.Company,
                                self.tables.companies,
                                self.classes.Manager,
                                self.classes.Employee,
                                self.tables.employees,
                                self.classes.Engineer)

        mapper(Company, companies, properties={
            'engineers':relationship(Engineer)
        })
        mapper(Employee, employees, polymorphic_on=employees.c.type, properties={
            'company':relationship(Company)
        })
        mapper(Manager, inherits=Employee, polymorphic_identity='manager')
        mapper(Engineer, inherits=Employee, polymorphic_identity='engineer')
        mapper(JuniorEngineer, inherits=Engineer, polymorphic_identity='juniorengineer')
        sess = sessionmaker()()

        c1 = Company(name='c1')
        c2 = Company(name='c2')

        m1 = Manager(name='Tom', manager_data='data1', company=c1)
        m2 = Manager(name='Tom2', manager_data='data2', company=c2)
        e1 = Engineer(name='Kurt', engineer_info='knows how to hack', company=c2)
        e2 = JuniorEngineer(name='Ed', engineer_info='oh that ed', company=c1)
        sess.add_all([c1, c2, m1, m2, e1, e2])
        sess.commit()

        eq_(c1.engineers, [e2])
        eq_(c2.engineers, [e1])

        sess.expunge_all()
        eq_(sess.query(Company).order_by(Company.name).all(),
            [
                Company(name='c1', engineers=[JuniorEngineer(name='Ed')]),
                Company(name='c2', engineers=[Engineer(name='Kurt')])
            ]
        )

        # eager load join should limit to only "Engineer"
        sess.expunge_all()
        eq_(sess.query(Company).options(joinedload('engineers')).order_by(Company.name).all(),
            [
                Company(name='c1', engineers=[JuniorEngineer(name='Ed')]),
                Company(name='c2', engineers=[Engineer(name='Kurt')])
            ]
       )

        # join() to Company.engineers, Employee as the requested entity
        sess.expunge_all()
        eq_(sess.query(Company, Employee).join(Company.engineers).order_by(Company.name).all(),
            [
                (Company(name='c1'), JuniorEngineer(name='Ed')),
                (Company(name='c2'), Engineer(name='Kurt'))
            ]
        )

        # join() to Company.engineers, Engineer as the requested entity.
        # this actually applies the IN criterion twice which is less than ideal.
        sess.expunge_all()
        eq_(sess.query(Company, Engineer).join(Company.engineers).order_by(Company.name).all(),
            [
                (Company(name='c1'), JuniorEngineer(name='Ed')),
                (Company(name='c2'), Engineer(name='Kurt'))
            ]
        )

        # join() to Company.engineers without any Employee/Engineer entity
        sess.expunge_all()
        eq_(sess.query(Company).join(Company.engineers).filter(Engineer.name.in_(['Tom', 'Kurt'])).all(),
            [
                Company(name='c2')
            ]
        )

        # this however fails as it does not limit the subtypes to just "Engineer".
        # with joins constructed by filter(), we seem to be following a policy where
        # we don't try to make decisions on how to join to the target class, whereas when using join() we
        # seem to have a lot more capabilities.
        # we might want to document "advantages of join() vs. straight filtering", or add a large
        # section to "inheritance" laying out all the various behaviors Query has.
        @testing.fails_on_everything_except()
        def go():
            sess.expunge_all()
            eq_(sess.query(Company).\
                filter(Company.company_id==Engineer.company_id).filter(Engineer.name.in_(['Tom', 'Kurt'])).all(),
                [
                    Company(name='c2')
                ]
            )
        go()


class ManyToManyToSingleTest(fixtures.MappedTest, AssertsCompiledSQL):
    __dialect__ = 'default'

    @classmethod
    def define_tables(cls, metadata):
        Table('parent', metadata,
                Column('id', Integer, primary_key=True,
                            test_needs_autoincrement=True)
            )
        Table('m2m', metadata,
                Column('parent_id', Integer,
                            ForeignKey('parent.id'), primary_key=True),
                Column('child_id', Integer,
                            ForeignKey('child.id'), primary_key=True),
            )
        Table('child', metadata,
                Column('id', Integer, primary_key=True,
                            test_needs_autoincrement=True),
                Column('discriminator', String(20)),
                Column('name', String(20))
            )

    @classmethod
    def setup_classes(cls):
        class Parent(cls.Comparable):
            pass

        class Child(cls.Comparable):
            pass

        class SubChild1(Child):
            pass

        class SubChild2(Child):
            pass

    @classmethod
    def setup_mappers(cls):
        mapper(cls.classes.Parent, cls.tables.parent, properties={
                "s1": relationship(cls.classes.SubChild1,
                        secondary=cls.tables.m2m,
                        uselist=False),
                "s2": relationship(cls.classes.SubChild2,
                        secondary=cls.tables.m2m)
            })
        mapper(cls.classes.Child, cls.tables.child,
                        polymorphic_on=cls.tables.child.c.discriminator)
        mapper(cls.classes.SubChild1, inherits=cls.classes.Child,
                    polymorphic_identity='sub1')
        mapper(cls.classes.SubChild2, inherits=cls.classes.Child,
                    polymorphic_identity='sub2')

    @classmethod
    def insert_data(cls):
        Parent = cls.classes.Parent
        SubChild1 = cls.classes.SubChild1
        SubChild2 = cls.classes.SubChild2
        s = Session()
        s.add_all([
                Parent(s1=SubChild1(name='sc1_1'),
                    s2=[SubChild2(name="sc2_1"), SubChild2(name="sc2_2")]
                ),
        ])
        s.commit()

    def test_eager_join(self):
        Parent = self.classes.Parent
        SubChild1 = self.classes.SubChild1

        s = Session()

        p1 = s.query(Parent).options(joinedload(Parent.s1)).all()[0]
        eq_(p1.__dict__['s1'], SubChild1(name='sc1_1'))

    def test_manual_join(self):
        Parent = self.classes.Parent
        Child = self.classes.Child
        SubChild1 = self.classes.SubChild1

        s = Session()

        p1, c1 = s.query(Parent, Child).outerjoin(Parent.s1).all()[0]
        eq_(c1, SubChild1(name='sc1_1'))

    def test_assert_join_sql(self):
        Parent = self.classes.Parent
        Child = self.classes.Child

        s = Session()

        self.assert_compile(
            s.query(Parent, Child).outerjoin(Parent.s1),
            "SELECT parent.id AS parent_id, child.id AS child_id, "
            "child.discriminator AS child_discriminator, "
            "child.name AS child_name "
            "FROM parent LEFT OUTER JOIN (m2m AS m2m_1 "
            "JOIN child ON child.id = m2m_1.child_id "
            "AND child.discriminator IN (:discriminator_1)) "
            "ON parent.id = m2m_1.parent_id"
        )

    def test_assert_joinedload_sql(self):
        Parent = self.classes.Parent
        Child = self.classes.Child

        s = Session()

        self.assert_compile(
            s.query(Parent).options(joinedload(Parent.s1)),
            "SELECT parent.id AS parent_id, child_1.id AS child_1_id, "
            "child_1.discriminator AS child_1_discriminator, "
            "child_1.name AS child_1_name "
            "FROM parent LEFT OUTER JOIN "
            "(m2m AS m2m_1 JOIN child AS child_1 "
            "ON child_1.id = m2m_1.child_id AND child_1.discriminator "
            "IN (:discriminator_1)) ON parent.id = m2m_1.parent_id"
        )

class SingleOnJoinedTest(fixtures.MappedTest):
    @classmethod
    def define_tables(cls, metadata):
        global persons_table, employees_table

        persons_table = Table('persons', metadata,
           Column('person_id', Integer, primary_key=True, test_needs_autoincrement=True),
           Column('name', String(50)),
           Column('type', String(20), nullable=False)
        )

        employees_table = Table('employees', metadata,
           Column('person_id', Integer, ForeignKey('persons.person_id'),primary_key=True),
           Column('employee_data', String(50)),
           Column('manager_data', String(50)),
        )

    def test_single_on_joined(self):
        class Person(fixtures.ComparableEntity):
            pass
        class Employee(Person):
            pass
        class Manager(Employee):
            pass

        mapper(Person, persons_table, polymorphic_on=persons_table.c.type,
                    polymorphic_identity='person')
        mapper(Employee, employees_table, inherits=Person,polymorphic_identity='engineer')
        mapper(Manager, inherits=Employee,polymorphic_identity='manager')

        sess = create_session()
        sess.add(Person(name='p1'))
        sess.add(Employee(name='e1', employee_data='ed1'))
        sess.add(Manager(name='m1', employee_data='ed2', manager_data='md1'))
        sess.flush()
        sess.expunge_all()

        eq_(sess.query(Person).order_by(Person.person_id).all(), [
            Person(name='p1'),
            Employee(name='e1', employee_data='ed1'),
            Manager(name='m1', employee_data='ed2', manager_data='md1')
        ])
        sess.expunge_all()

        eq_(sess.query(Employee).order_by(Person.person_id).all(), [
            Employee(name='e1', employee_data='ed1'),
            Manager(name='m1', employee_data='ed2', manager_data='md1')
        ])
        sess.expunge_all()

        eq_(sess.query(Manager).order_by(Person.person_id).all(), [
            Manager(name='m1', employee_data='ed2', manager_data='md1')
        ])
        sess.expunge_all()

        def go():
            eq_(sess.query(Person).with_polymorphic('*').order_by(Person.person_id).all(), [
                Person(name='p1'),
                Employee(name='e1', employee_data='ed1'),
                Manager(name='m1', employee_data='ed2', manager_data='md1')
            ])
        self.assert_sql_count(testing.db, go, 1)