bookwyrm/fedireads/utils/fields.py

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2020-02-15 22:19:36 +00:00
'''Quick and dirty shim for JSONField and ArrayField compatibility on sqlite.
For more info and original code, see:
- https://medium.com/@philamersune/using-postgresql-jsonfield-in-sqlite-95ad4ad2e5f1
- https://gist.github.com/pvsune/2e5f9f9ae356d0bff633d896bc7d168b#file-django-sqlite-fields-py
'''
import json
from django.conf import settings
from django.contrib.postgres.fields import (
JSONField as DjangoJSONField,
ArrayField as DjangoArrayField,
)
from django.db.models import Field
class JSONField(DjangoJSONField):
pass
class ArrayField(DjangoArrayField):
pass
if 'sqlite' in settings.DATABASES['default']['ENGINE']:
class JSONField(Field):
def db_type(self, connection):
return 'text'
def from_db_value(self, value, expression, connection):
if value is not None:
return self.to_python(value)
return value
def to_python(self, value):
if value is not None:
try:
return json.loads(value)
except (TypeError, ValueError):
return value
return value
def get_prep_value(self, value):
if value is not None:
return str(json.dumps(value))
return value
def value_to_string(self, obj):
return self.value_from_object(obj)
class ArrayField(JSONField):
def __init__(self, base_field, size=None, **kwargs):
"""Care for DjangoArrayField's kwargs."""
self.base_field = base_field
self.size = size
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super().__init__(**kwargs)
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def deconstruct(self):
"""Need to create migrations properly."""
name, path, args, kwargs = super().deconstruct()
kwargs.update({
'base_field': self.base_field.clone(),
'size': self.size,
})
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return name, path, args, kwargs