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from django import forms
from django.db.models import Field
from ..utils import SparseVector
# https://docs.djangoproject.com/en/5.0/howto/custom-model-fields/
class SparseVectorField(Field):
description = 'Sparse vector'
empty_strings_allowed = False
def __init__(self, *args, dimensions=None, **kwargs):
self.dimensions = dimensions
super().__init__(*args, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.dimensions is not None:
kwargs['dimensions'] = self.dimensions
return name, path, args, kwargs
def db_type(self, connection):
if self.dimensions is None:
return 'sparsevec'
return 'sparsevec(%d)' % self.dimensions
def from_db_value(self, value, expression, connection):
return SparseVector._from_db(value)
def to_python(self, value):
return SparseVector._from_db(value)
def get_prep_value(self, value):
return SparseVector._to_db(value)
def value_to_string(self, obj):
return self.get_prep_value(self.value_from_object(obj))
def formfield(self, **kwargs):
return super().formfield(form_class=SparseVectorFormField, **kwargs)
class SparseVectorWidget(forms.TextInput):
def format_value(self, value):
if isinstance(value, SparseVector):
value = value.to_text()
return super().format_value(value)
class SparseVectorFormField(forms.CharField):
widget = SparseVectorWidget
def to_python(self, value):
if isinstance(value, str) and value == '':
return None
return super().to_python(value)
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