Created
March 24, 2017 19:54
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SqlAlchemy expression wrapper
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from sqlalchemy.sql.elements import BinaryExpression | |
class C(object): | |
""" | |
This class is intend to be used in tests with unittest.mock.call | |
This class allows to wrap an sqlalchemy BinaryExpression in a way | |
you can compare a BinaryExpression agains a Wrapped BinaryExpression | |
to check if they are equivalent, as comparing them directly results | |
in another BinaryExpression. | |
e.g.: | |
operator_1 = ModelClass.name == 'example' | |
operator_2 = ModelClass.name == 'cool' | |
operator_3 = ModelClass.name == 'example' | |
operator_1 == operator_2 # This results in a BinaryExpression | |
C(operator_1) == operator_2 # This returns False | |
C(operator_1) == operator_3 # This returns True | |
C(operator_1) == C(operator_3) # This also returns True | |
""" | |
def __init__(self, comp): | |
if not isinstance(comp, BinaryExpression): | |
raise TypeError( | |
'An sqlalchemy.sql.elements.BinaryExpression was expected' | |
) | |
self.comp = comp | |
def __eq__(self, other): | |
if isinstance(other, self.__class__): | |
return self.comp.compare(other.comp) | |
elif not isinstance(other, BinaryExpression): | |
raise TypeError( | |
'Right hand value must be sqlalchemy.sql.elements.BinaryExpression' # noqa | |
) | |
return self.comp.compare(other) |
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