ming nested subdocument using imperative mapping

[Rafael Ribeiro]

Hi all,

 I am porting an application from mongoengine to ming and I wished to map a nested document. I've seen another post mentioning the subdocument feature but since I am not using the declarative approach to mapping I'd like to know whether it is possible to do it using the imperative mapping approach ( https://ming.readthedocs.io/en/latest/baselevel.html#ming-baselevel ).

 Is it possible to load an object and have another class nested inside?

best regards,

Rafael

[Vincenzo Castiglia]

are you looking for schema.Object? https://ming.readthedocs.io/en/latest/api/ming.schema.html#ming.schema.Object 

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[Rafael Ribeiro]

Not exactly since it'll convert back to a ming.base.Object as per the documentation. I was looking for something that would be able to convert back to an arbitrary class from my code.

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[Vincenzo Castiglia]

ok, then what about subclassing like this

```

class MyConverter(schema.Object):

    def _validate(self, d, allow_extra=False, strip_extra=False):

        return MyClass(super()._validate(d, allow_extra=allow_extra, strip_extra=strip_extra))

```

assuming your class have a __init__ that takes a dict or is a subclass of collections.UserDict

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[Rafael Ribeiro]

Looks promising ... but how should I register this converter and is it possible to have more than one converter registered for schema.Object? In case I have two or more places in which I have nested objects like this. I have the impression that ming lacks the properties parameter in the mapper function and also lacks a relationship function just like SQLAlchemy does on this scenario.

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