from peewee import Expression, Field

from .. import Vector

class VectorField(Field):

field_type = 'vector'

def __init__(self, dimensions=None, *args, **kwargs):

self.dimensions = dimensions

super(VectorField, self).__init__(*args, **kwargs)

def get_modifiers(self):

return self.dimensions and [self.dimensions] or None

def db_value(self, value):

return Vector._to_db(value)

def python_value(self, value):

return Vector._from_db(value)

def _distance(self, op, vector):

return Expression(lhs=self, op=op, rhs=self.to_value(vector))

def l2_distance(self, vector):

return self._distance('<->', vector)

def max_inner_product(self, vector):

return self._distance('<#>', vector)

def cosine_distance(self, vector):

return self._distance('<=>', vector)

def l1_distance(self, vector):

return self._distance('<+>', vector)