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from peewee import Expression, Field
class FixedBitField(Field):
field_type = 'bit'
def __init__(self, max_length=None, *args, **kwargs):
self.max_length = max_length
super(FixedBitField, self).__init__(*args, **kwargs)
def get_modifiers(self):
return self.max_length and [self.max_length] or None
def _distance(self, op, vector):
return Expression(lhs=self, op=op, rhs=self.to_value(vector))
def hamming_distance(self, vector):
return self._distance('<~>', vector)
def jaccard_distance(self, vector):
return self._distance('<%%>', vector)
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