Hi,
I have a problem with a custom JSON type, which is not preserving keys
order, despite that I'm using python 3.8.
Here is the type definition and usage:
```
import json
from sqlalchemy import Column, Integer
from sqlalchemy.types import TypeDecorator, TEXT
from sqlalchemy.ext.mutable import MutableDict
class JSONType(TypeDecorator):
impl = TEXT
def process_bind_param(self, value, dialect):
if value is not None:
value = json.dumps(value)
return value
def process_result_value(self, value, dialect):
if value is not None:
value = json.loads(value)
return value
JSONDict = MutableDict.as_mutable(JSONType)
Base = automap_base()
class Picture(Base):
__tablename__ = 'picture'
id = Column(Integer, primary_key=True)
data = Column(JSONDict)
```
When I'm storing values in the data field (values are nested elements of
different types), store the picture in database and reload it, the keys
order of data dict is not preserved. I'm don't understand why, because the
version of python I'm using is supposed to keep the dict insertion order.
Have you some idea how to solve that ? The JSON keys order is important for
my application.
Thank you
--
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