How do I convert a MappedClass object to JSON?
json.dumps({"data": mappedClassObject}, indent=True)
Above code raises error that MappedClass object is not JSON serializable.
Is there any utility similar to BSON's json_util to convert MappedClass to JSON? or Do I have to write a encoder as mentioned in TypeError: ObjectId('') is not JSON serializable
Am using python 2.7
As of now, I have created a encoder for my use. This is hacky and if there is a better alternate, I will consider it.
# MappedClass from Ming is not JSON serializable and we do not have utilities like json_util (for BSON) to convert
# MappedClass object to JSON. Below encoder is created for this requirement.
# Usage: MappedClassJSONEncoder().encode(data)
class MappedClassJSONEncoder(JSONEncoder):
"""
Returns a MappedClass object JSON representation.
"""
def _get_document_properties(self, klass):
"""
Returns the declared properties of the MappedClass's child class which represents Mongo Document
Includes only the user declared properties such as tenantId, _id etc
:param klass:
:return:
"""
return [k for k in dir(klass) if k not in dir(MappedClass)]
def _get_attr_json_value(self, attr):
if isinstance(attr, bson.objectid.ObjectId):
return str(attr)
elif isinstance(attr, datetime.datetime):
return attr.isoformat()
elif isinstance(attr, dict):
dict_data = {}
for member in attr:
dict_data.update({member: self._get_attr_json_value(attr[member])})
return dict_data
else:
return attr
def default(self, o):
mapped_class_attributes = self._get_document_properties(type(o))
attributes_data = {}
for attr_name in mapped_class_attributes:
attr = o.__getattribute__(attr_name)
attributes_data.update({attr_name: self._get_attr_json_value(attr)})
return attributes_data