SQLAlchemy JSON as blob/text

Question

I\'m storing JSON down as blob/text in a column using MySQL. Is there a simple way to convert this into a dict using python/SQLAlchemy?

Answer 1

There is a recipe for this in the official documentation:

from sqlalchemy.types import TypeDecorator, VARCHAR
import json

class JSONEncodedDict(TypeDecorator):
    """Represents an immutable structure as a json-encoded string.

    Usage::

        JSONEncodedDict(255)

    """

    impl = VARCHAR

    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