Python orm.relation函数代码示例

def setup_orm():
    tables = meta.metadata.tables
    orm.mapper(Language, tables['languages'])
    orm.mapper(I18nText, tables['i18n_texts'],
               properties={
                   'versions': relation(I18nTextVersion,
                                        order_by=tables['i18n_texts_versions'].c.language_id.asc())
               })

    orm.mapper(I18nTextVersion, tables['i18n_texts_versions'],
               properties={ 'language': relation(Language) })


    # LanguageText is deprecated until it uses I18nText
    orm.mapper(LanguageText,
               tables['language_texts'],
               properties={
                   'language': relation(Language,
                                        backref=backref('texts',
                                                        order_by=tables['language_texts'].c.id.asc(),
                                                        cascade='all, delete-orphan'))})

    orm.mapper(Country,
               tables['countries'],
               properties={
                   'language': relation(Language,
                                        backref=backref('countries',
                                                        cascade='all, delete-orphan',
                                                        order_by=tables['countries'].c.id.asc()))})

    def testone(self):
        """
        Tests eager load of a many-to-one attached to a one-to-many.  this
        testcase illustrated the bug, which is that when the single Company is
        loaded, no further processing of the rows occurred in order to load
        the Company's second Address object.

        """
        mapper(Address, addresses)

        mapper(Company, companies, properties={"addresses": relation(Address, lazy=False)})

        mapper(Invoice, invoices, properties={"company": relation(Company, lazy=False)})

        a1 = Address(address="a1 address")
        a2 = Address(address="a2 address")
        c1 = Company(company_name="company 1", addresses=[a1, a2])
        i1 = Invoice(date=datetime.datetime.now(), company=c1)

        session = create_session()
        session.add(i1)
        session.flush()

        company_id = c1.company_id
        invoice_id = i1.invoice_id

        session.expunge_all()
        c = session.query(Company).get(company_id)

        session.expunge_all()
        i = session.query(Invoice).get(invoice_id)

        eq_(c, i.company)

def initialize_mapper():
    orm.mapper(Content, content,
               polymorphic_on=content.c.object_type,
               polymorphic_identity='content',
               properties = {
                   'children': orm.relation(
                       Content,
                       backref=orm.backref(
                           'parent',
                           remote_side=[content.c.content_id])),
                   'relations': orm.relation(
                       Relation,
                       cascade="all, delete-orphan",
                       primaryjoin=content.c.content_id==relations.c.source_id,
                       backref=orm.backref("source"))})

    orm.mapper(Relation, relations,
               properties = {
               'target': orm.relation(
                   Content, uselist=False,
                   primaryjoin=content.c.content_id==relations.c.target_id)})

    orm.mapper(File, files,
               polymorphic_on=files.c.type,
               polymorphic_identity='db-file')

def initModels():
    """Initialize timebot DB tables and mappers"""
    engine = db.getEngine()
    meta = db.getMeta()
    session = db.getSession()

    tb_user = Table(
            'tb_user', meta,
            Column('id', Integer, primary_key=True, autoincrement=True),
            Column('company_id', None, ForeignKey('tb_company.id'), nullable=True),
            Column('jid', Unicode(50), unique=True, nullable=False),
            Column('name', Unicode(50)),
            Column('rate', Integer))

    tb_worktime = Table(
            'tb_time', meta,
            Column('id', Integer, primary_key=True),
            Column('user_id', None, ForeignKey('tb_user.id'), nullable=False),
            Column('start', DateTime, default=datetime.now),
            Column('stop', DateTime, nullable=True))

    tb_company = Table(
            'tb_company', meta,
            Column('id', Integer, primary_key=True),
            Column('name', Unicode(50), nullable=True))

    meta.create_all()

    mapper(TUser, tb_user, properties=dict(
            worktime=relation(TWorktime),
            company=relation(TCompany)))
    mapper(TWorktime, tb_worktime, properties=dict(
            user=relation(TUser)))
    mapper(TCompany, tb_company, properties=dict(
            users=relation(TUser)))

 def versions_properties(item_class, change_class, versions_table):
     props = {
         "change": relation(change_class, uselist=False),
         "head": relation(item_class, uselist=False)
     }
     # Notes:
     # - domain.AttachedFile is the only versionable type that is 
     # not a ParliamentaryItem.
     # - !+IVersionable(mr, jul-2011) an AttachedFile does not have 
     # attached_files; but, this violates the meaning of IVersionable? 
     # Or, the ability to have attached_files should be independent of
     # being versionable? IMayAttachFiles
     if item_class is not domain.AttachedFile:
         props["attached_files"] = relation(domain.AttachedFileVersion,
             primaryjoin=rdb.and_(
                 versions_table.c.content_id ==
                     schema.attached_file_versions.c.item_id,
                 versions_table.c.version_id ==
                     schema.attached_file_versions.c.file_version_id
             ),
             foreign_keys=[
                 schema.attached_file_versions.c.item_id,
                 schema.attached_file_versions.c.file_version_id
             ]
         )
     return props

	def InitMapper( cls, metadata, ObjectType ):
		cls.__table__ = Table( cls.__tablename__, metadata,
				Column('id',	    Integer,     index = True, primary_key = True),
				Column('type_id',	Integer,     ForeignKey( ObjectType.id ), nullable = False),
				Column('parent_id', Integer,     ForeignKey( "%s.id" % cls.__tablename__ ), nullable = True),
				Column('name',      Text,        nullable = False),
				Column('size',      Integer(64), nullable = False, default = 0),
				Column('pos_x',     Integer(64), nullable = False, default = 0),
				Column('pos_y',     Integer(64), nullable = False, default = 0),
				Column('pos_z',     Integer(64), nullable = False, default = 0),
				Column('mtime',	    DateTime,    nullable = False,
					onupdate = func.current_timestamp(), default = func.current_timestamp()))

		cols = cls.__table__.c

		Index('ix_%s_position' % cls.__tablename__, cols.pos_x, cols.pos_y, cols.pos_z)

		mapper( cls, cls.__table__, polymorphic_on = cols.type_id, properties = {
			'type': relation( ObjectType,
				uselist = False,
				backref = backref( 'objects' )),
			# Tree like hierarchy for objects ie. Universe => Solar systems => Planets => etc.
			'children': relation( cls,
				backref = backref( 'parent', remote_side = [ cols.id ] )),
			# Object position in 3D space
			'position': composite( Vector3D, cols.pos_x, cols.pos_y, cols.pos_z ),
			})

def create_tables():
    """Create tables filled with test data."""

    occupations_table = Table('occupations', metadata,
        Column('id', Integer, primary_key=True),
        Column('name', String(20)))
    users_table = Table('users', metadata,
        Column('id', Integer, primary_key=True),
        Column('name', String(20)),
        Column('occupation_id', Integer, ForeignKey("occupations.id")))
    addresses_table = Table('addresses', metadata,
        Column('id', Integer, primary_key=True),
        Column('user_id', Integer, ForeignKey("users.id")),
        Column('street', String(50)),
        Column('city', String(40)))

    mapper(Occupation, occupations_table)
    mapper(User, users_table, properties={
        'occupation' : relation(Occupation, lazy=False),
        'addresses': relation(Address, backref='user', lazy=False)})
    mapper(Address, addresses_table)

    try:
        metadata.create_all()
    except Exception, error:
        # workaround for a problem with PySqlite < 2.6 and SQLAlchemy < 0.5
        if 'Cannot operate on a closed cursor' in str(error):
            metadata.create_all(checkfirst=False)
        else:
            raise

def init_model(engine):
	"""Call me before using any of the tables or classes in the model"""
	global prefix_table
	prefix_table = schema.Table('prefix', meta.metadata, 
			schema.Column('id', types.Integer,
				schema.Sequence('prefix_id_seq'), primary_key=True),
			schema.Column('prefix', types.Text())
			)
	
	global users_table
	users_table = schema.Table('users', meta.metadata, 
			schema.Column('id', types.Integer,
				schema.Sequence('users_id_seq'), primary_key=True),
			schema.Column('name', types.Text()),
			schema.Column('password', types.Text()),
			schema.Column('real_name', types.Text())
			)
	
	global users_prefix_access
	users_prefix_access = schema.Table('user_prefix_access', meta.metadata, 
			schema.Column('user_id', types.Integer, schema.ForeignKey('users.id'), primary_key=True),
			schema.Column('prefix_id', types.Integer, schema.ForeignKey('prefix.id'), primary_key=True),
			schema.Column('write_access', types.Integer)
			)

	orm.mapper(Users, users_table, properties = { 'base':orm.relation(UsersPrefixAssociation) })
	orm.mapper(UsersPrefixAssociation, users_prefix_access, properties = { 'prefix':orm.relation(Prefix) })
	orm.mapper(Prefix, prefix_table)
	
	meta.Session.configure(bind=engine)
	meta.engine = engine

def reload_mapper(metadata, now):
    """<comment-ja>
    Machine2Jobgroup(Model)のマッパーをリロードします。
    @param metadata: リロードしたいMetaData
    @type metadata: sqlalchemy.schema.MetaData
    @param now: now
    @type now: Datatime
    </comment-ja>
    <comment-en>
    TODO: English Comment
    </comment-en>
    """
    t_machine2jobgroup = get_machine2jobgroup_table(metadata, now)
    t_machine = metadata.tables["machine"]
    t_user = metadata.tables["user"]
    mapper(Machine2Jobgroup, t_machine2jobgroup, properties={
        'created_user' : relation(karesansui.db.model.user.User,
                                  primaryjoin=t_machine2jobgroup.c.created_user_id==t_user.c.id),
        
        'modified_user' : relation(karesansui.db.model.user.User,
                                   primaryjoin=t_machine2jobgroup.c.modified_user_id==t_user.c.id),
        
        'machine' : relation(karesansui.db.model.machine.Machine,
                             primaryjoin=t_machine2jobgroup.c.machine_id==t_machine.c.id,
                             ),
        })

    def test_double(self):
        """test that a mapper can have two eager relations to the same table, via
        two different association tables.  aliases are required."""

        Place.mapper = mapper(Place, place, properties = {
            'thingies':relation(mapper(PlaceThingy, place_thingy), lazy=False)
        })

        Transition.mapper = mapper(Transition, transition, properties = dict(
            inputs = relation(Place.mapper, place_output, lazy=False),
            outputs = relation(Place.mapper, place_input, lazy=False),
            )
        )

        tran = Transition('transition1')
        tran.inputs.append(Place('place1'))
        tran.outputs.append(Place('place2'))
        tran.outputs.append(Place('place3'))
        sess = create_session()
        sess.add(tran)
        sess.flush()

        sess.expunge_all()
        r = sess.query(Transition).all()
        self.assert_unordered_result(r, Transition,
            {'name': 'transition1',
            'inputs': (Place, [{'name':'place1'}]),
            'outputs': (Place, [{'name':'place2'}, {'name':'place3'}])
            })

def reload_mapper(metadata, now):
    """<comment-ja>
    Machine(Model)のマッパーをリロードします。
    @param metadata: リロードしたいMetaData
    @type metadata: sqlalchemy.schema.MetaData
    @param now: now
    @type now: Datatime
    </comment-ja>
    <comment-en>
    TODO: English Comment
    </comment-en>
    """
    t_machine = get_machine_table(metadata, now)
    t_machine_tag = metadata.tables['machine2tag']
    t_user = metadata.tables['user']
    
    mapper(Machine, t_machine, properties={
        'children' : relation(Machine,
                              backref=backref('parent',
                                              remote_side=[t_machine.c.id])),
        'notebook' : relation(karesansui.db.model.notebook.Notebook),
        'created_user' : relation(karesansui.db.model.user.User,
                                  primaryjoin=t_machine.c.created_user_id==t_user.c.id),
        'modified_user' : relation(karesansui.db.model.user.User,
                                  primaryjoin=t_machine.c.modified_user_id==t_user.c.id),
        'tags' : relation(karesansui.db.model.tag.Tag,
                         secondary=t_machine_tag,
                         backref="machine"),
        })

def orm_load_baseordereddataset(man):
    man.baseordereddataset_table = Table('baseordereddataset', man.metadata,
                                         Column('id', Integer, primary_key=True),
                                         Column('created', DateTime),
                                         Column('label', String(50), nullable=False, unique=True),
                                         Column('type', String(30), nullable=False))

    man.ordereditems_table = Table('ordereddata_items', man.metadata,
                         Column('dataset_id', Integer, ForeignKey('baseordereddataset.id'),
                                primary_key=True),
                         Column('item_id', Integer, ForeignKey('basedata.basedata_id'),
                                primary_key=True),
                         Column('index', Integer, nullable=False)
                         )
    
    man.metadata.create_all()

    mapper(BaseOrderedDataSet, man.baseordereddataset_table,
           polymorphic_on=man.baseordereddataset_table.c.type, polymorphic_identity='base_ordered_dataset',
           properties={'data_items': relation(OrderedDataSetItem,
                                                  backref='ordered_datasets_items',
                                                  cascade='all, delete-orphan',
                                                  collection_class=column_mapped_collection(man.ordereditems_table.c.index))
                       }
           )
    mapper(OrderedDataSetItem, man.ordereditems_table, properties={
        'item': relation(BaseData, lazy='joined', backref='dataitem')
        })

def setup_orm():
    tables = meta.metadata.tables
    columns = tables['group_mailing_list_messages'].c
    orm.mapper(GroupMailingListMessage,
               tables['group_mailing_list_messages'],
               inherits=ContentItem,
               polymorphic_identity='mailing_list_message',
               polymorphic_on=tables['content_items'].c.content_type,
               properties = {
                             'reply_to': relation(GroupMailingListMessage,
                                                  backref=backref('replies'),
                                                  foreign_keys=(columns.reply_to_message_machine_id),
                                                  primaryjoin=columns.id == columns.reply_to_message_machine_id,
                                                  remote_side=(columns.id)),
                             'thread': relation(GroupMailingListMessage,
                                                post_update=True,
                                                order_by=[asc(columns.sent)],
                                                backref=backref('posts'),
                                                foreign_keys=(columns.thread_message_machine_id),
                                                primaryjoin=columns.id == columns.thread_message_machine_id,
                                                remote_side=(columns.id)),
                             'author': relation(User,
                                                backref=backref('messages')),
                             'group': relation(Group,
                                               primaryjoin=(columns.group_id == tables['groups'].c.id)),
                             'attachments': synonym("files")
                             })

    def setUp(self):
        if not sqlalchemy:
            self.skipTest("'sqlalchemy' is not available")

        # Create DB and map objects
        self.metadata = MetaData()
        self.engine = create_engine("sqlite:///:memory:", echo=False)

        Session = sessionmaker(bind=self.engine)

        self.session = Session()
        self.tables = {}

        self.tables["users"] = Table(
            "users", self.metadata, Column("id", Integer, primary_key=True), Column("name", String(64))
        )

        self.tables["addresses"] = Table(
            "addresses",
            self.metadata,
            Column("id", Integer, primary_key=True),
            Column("user_id", Integer, ForeignKey("users.id")),
            Column("email_address", String(128)),
        )

        self.tables["lazy_loaded"] = Table(
            "lazy_loaded",
            self.metadata,
            Column("id", Integer, primary_key=True),
            Column("user_id", Integer, ForeignKey("users.id")),
        )

        self.tables["another_lazy_loaded"] = Table(
            "another_lazy_loaded",
            self.metadata,
            Column("id", Integer, primary_key=True),
            Column("user_id", Integer, ForeignKey("users.id")),
        )

        self.mappers = {}

        self.mappers["user"] = mapper(
            User,
            self.tables["users"],
            properties={
                "addresses": relation(Address, backref="user", lazy=False),
                "lazy_loaded": relation(LazyLoaded, lazy=True),
                "another_lazy_loaded": relation(AnotherLazyLoaded, lazy=True),
            },
        )

        self.mappers["addresses"] = mapper(Address, self.tables["addresses"])
        self.mappers["lazy_loaded"] = mapper(LazyLoaded, self.tables["lazy_loaded"])
        self.mappers["another_lazy_loaded"] = mapper(AnotherLazyLoaded, self.tables["another_lazy_loaded"])

        self.metadata.create_all(self.engine)

        pyamf.register_class(User, "server.User")
        pyamf.register_class(Address, "server.Address")
        pyamf.register_class(LazyLoaded, "server.LazyLoaded")

    def test_bidirectional(self):
        """tests a many-to-many backrefs"""
        Place.mapper = mapper(Place, place)
        Transition.mapper = mapper(Transition, transition, properties = dict(
            inputs = relation(Place.mapper, place_output, lazy=True, backref='inputs'),
            outputs = relation(Place.mapper, place_input, lazy=True, backref='outputs'),
            )
        )

        t1 = Transition('transition1')
        t2 = Transition('transition2')
        t3 = Transition('transition3')
        p1 = Place('place1')
        p2 = Place('place2')
        p3 = Place('place3')

        t1.inputs.append(p1)
        t1.inputs.append(p2)
        t1.outputs.append(p3)
        t2.inputs.append(p1)
        p2.inputs.append(t2)
        p3.inputs.append(t2)
        p1.outputs.append(t1)
        sess = create_session()
        sess.add_all((t1, t2, t3,p1, p2, p3))
        sess.flush()

        self.assert_result([t1], Transition, {'outputs': (Place, [{'name':'place3'}, {'name':'place1'}])})
        self.assert_result([p2], Place, {'inputs': (Transition, [{'name':'transition1'},{'name':'transition2'}])})