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90 lines
2.5 KiB
Python
90 lines
2.5 KiB
Python
import sqlalchemy as sa
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from sqlalchemy import exc as sa_exc
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_repr_stack = set()
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class BasicEntity(object):
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def __init__(self, **kw):
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for key, value in kw.iteritems():
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setattr(self, key, value)
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def __repr__(self):
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if id(self) in _repr_stack:
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return object.__repr__(self)
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_repr_stack.add(id(self))
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try:
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return "%s(%s)" % (
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(self.__class__.__name__),
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', '.join(["%s=%r" % (key, getattr(self, key))
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for key in sorted(self.__dict__.keys())
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if not key.startswith('_')]))
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finally:
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_repr_stack.remove(id(self))
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_recursion_stack = set()
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class ComparableEntity(BasicEntity):
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def __hash__(self):
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return hash(self.__class__)
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def __ne__(self, other):
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return not self.__eq__(other)
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def __eq__(self, other):
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"""'Deep, sparse compare.
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Deeply compare two entities, following the non-None attributes of the
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non-persisted object, if possible.
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"""
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if other is self:
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return True
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elif not self.__class__ == other.__class__:
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return False
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if id(self) in _recursion_stack:
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return True
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_recursion_stack.add(id(self))
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try:
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# pick the entity thats not SA persisted as the source
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try:
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self_key = sa.orm.attributes.instance_state(self).key
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except sa.orm.exc.NO_STATE:
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self_key = None
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if other is None:
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a = self
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b = other
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elif self_key is not None:
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a = other
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b = self
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else:
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a = self
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b = other
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for attr in a.__dict__.keys():
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if attr.startswith('_'):
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continue
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value = getattr(a, attr)
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try:
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# handle lazy loader errors
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battr = getattr(b, attr)
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except (AttributeError, sa_exc.UnboundExecutionError):
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return False
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if hasattr(value, '__iter__'):
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if list(value) != list(battr):
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return False
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else:
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if value is not None and value != battr:
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return False
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return True
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finally:
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_recursion_stack.remove(id(self))
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