Python collection.internally_instrumented方法代码示例

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import internally_instrumented [as 别名]
def internally_instrumented(fn):
        """Tag the method as instrumented.

        This tag will prevent any decoration from being applied to the
        method. Use this if you are orchestrating your own calls to
        :func:`.collection_adapter` in one of the basic SQLAlchemy
        interface methods, or to prevent an automatic ABC method
        decoration from wrapping your implementation::

            # normally an 'extend' method on a list-like class would be
            # automatically intercepted and re-implemented in terms of
            # SQLAlchemy events and append().  your implementation will
            # never be called, unless:
            @collection.internally_instrumented
            def extend(self, items): ...

        """
        fn._sa_instrumented = True
        return fn 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import internally_instrumented [as 别名]
def remove(self, value, _sa_initiator=None):
        """Remove an item by value, consulting the keyfunc for the key."""

        key = self.keyfunc(value)
        # Let self[key] raise if key is not in this collection
        # testlib.pragma exempt:__ne__
        if self[key] != value:
            raise sa_exc.InvalidRequestError(
                "Can not remove '%s': collection holds '%s' for key '%s'. "
                "Possible cause: is the MappedCollection key function "
                "based on mutable properties or properties that only obtain "
                "values after flush?" % (value, self[key], key)
            )
        self.__delitem__(key, _sa_initiator)


# ensure instrumentation is associated with
# these built-in classes; if a user-defined class
# subclasses these and uses @internally_instrumented,
# the superclass is otherwise not instrumented.
# see [ticket:2406]. 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import internally_instrumented [as 别名]
def test_dict_subclass(self):
        class MyDict(dict):
            @collection.appender
            @collection.internally_instrumented
            def set(self, item, _sa_initiator=None):
                self.__setitem__(item.a, item, _sa_initiator=_sa_initiator)

            @collection.remover
            @collection.internally_instrumented
            def _remove(self, item, _sa_initiator=None):
                self.__delitem__(item.a, _sa_initiator=_sa_initiator)

        self._test_adapter(
            MyDict, self.dictable_entity, to_set=lambda c: set(c.values())
        )
        self._test_dict(MyDict)
        self._test_dict_bulk(MyDict)
        self.assert_(getattr(MyDict, "_sa_instrumented") == id(MyDict)) 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import internally_instrumented [as 别名]
def _convert(self, dictlike):
        """Validate and convert a dict-like object into values for set()ing.

        This is called behind the scenes when a MappedCollection is replaced
        entirely by another collection, as in::

          myobj.mappedcollection = {'a':obj1, 'b': obj2} # ...

        Raises a TypeError if the key in any (key, value) pair in the dictlike
        object does not match the key that this collection's keyfunc would
        have assigned for that value.

        """
        for incoming_key, value in util.dictlike_iteritems(dictlike):
            new_key = self.keyfunc(value)
            if incoming_key != new_key:
                raise TypeError(
                    "Found incompatible key %r for value %r; this "
                    "collection's "
                    "keying function requires a key of %r for this value." % (
                        incoming_key, value, new_key))
            yield value

# ensure instrumentation is associated with
# these built-in classes; if a user-defined class
# subclasses these and uses @internally_instrumented,
# the superclass is otherwise not instrumented.
# see [ticket:2406]. 

# 需要导入模块: from sqlalchemy.orm.collections import collection [as 别名]
# 或者: from sqlalchemy.orm.collections.collection import internally_instrumented [as 别名]
def _convert(self, dictlike):
        """Validate and convert a dict-like object into values for set()ing.

        This is called behind the scenes when a MappedCollection is replaced
        entirely by another collection, as in::

          myobj.mappedcollection = {'a':obj1, 'b': obj2} # ...

        Raises a TypeError if the key in any (key, value) pair in the dictlike
        object does not match the key that this collection's keyfunc would
        have assigned for that value.

        """
        for incoming_key, value in util.dictlike_iteritems(dictlike):
            new_key = self.keyfunc(value)
            if incoming_key != new_key:
                raise TypeError(
                    "Found incompatible key %r for value %r; this "
                    "collection's "
                    "keying function requires a key of %r for this value." % (
                    incoming_key, value, new_key))
            yield value

# ensure instrumentation is associated with
# these built-in classes; if a user-defined class
# subclasses these and uses @internally_instrumented,
# the superclass is otherwise not instrumented.
# see [ticket:2406].