Inserting a document with Pymongo - InvalidDocument: Cannot encode object

1. If you have numpy object for ex. int or float in the json/dict data_dict which you want to send over mongo using pymongo.
2. one might get "cannot encode object" error, to resolve this I have used a custom encoder like this.

---

class CustomEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, numpy.integer):
            return int(obj)
        elif isinstance(obj, numpy.floating):
            return float(obj)
        elif isinstance(obj, numpy.ndarray):
            return obj.tolist()
        else:
            return super(CustomEncoder, self).default(obj)
        
data_dict_1 = json.dumps(data_dict,cls=CustomEncoder)
data_dict_final  = json.loads(data_dict_1)

• Please check out docs here https://docs.python.org/3/library/json.html
• this way does not matter how your Json data is organised, it works.

Your problem is that numpy.int64 is foreign to MongoDB. I have had the same problem.

The solution is to convert the offending values to a datatype that MongoDB will understand, here is an example how I converted those offending values in my code:

try:
    collection.insert(r)
except pymongo.errors.InvalidDocument:
    # Python 2.7.10 on Windows and Pymongo are not forgiving
    # If you have foreign data types you have to convert them
    n = {}
    for k, v in r.items():
        if isinstance(k, unicode):
            for i in ['utf-8', 'iso-8859-1']:
                try:
                    k = k.encode(i)
                except (UnicodeEncodeError, UnicodeDecodeError):
                    continue
        if isinstance(v, np.int64):
            self.info("k is %s , v is %s" % (k, v))
            v = int(v)
            self.info("V is %s" % v)
        if isinstance(v, unicode):
            for i in ['utf-8', 'iso-8859-1']:
                try:
                    v = v.encode(i)
                except (UnicodeEncodeError, UnicodeDecodeError):
                    continue

        n[k] = v

    collection.insert(n)

I hope this helps you.