Saving None into MongoDB using MongoEngine Dynamic Document

Question

I am trying to save a MongoEngine Document into a Dynamic Document. Sample code is as follows:

class Small(mongoengine.Document):
    var_1 = mongoengine.IntField(db_field="var_1")
    var_2 = mongoengine.IntField(db_field="var_2")

class Main(mongoengine.DynamicDocument):
    timeseries = mongoengine.ListField(mongoengine.EmbeddedDocumentField('Small'),
                                       db_field="timeseries")

    def sample_insert():
        input = [(2, 4), (2, 6), (3, None), (4, None)]

        to_insert = [Small(var_1=i[0], var_2=i[1]) for i in input]

        self.timeseries = to_insert
        self.save()

The problem I am having occurs when one or more of the values to be saved is None. In this case the following error is generated:

mongoengine.errors.ValidationError: ValidationError (Data:55c0d57d1853bcad5c17b1f7) (var_1.Field is required)

I could set the None values to 0, but this is not a good solution as I can no longer distinguish between legitimate 0 values and non-existing values.

What I would love to do is be able to insert these None values as a 'null' entry into MongoDB.

Is this possible?

Azzabi Haythem · Accepted Answer · 2018-04-05 15:56:09Z

0

I had no problem running your code. The document inserted looks like this:

"timeseries" : [{ "var_1" : 2, "var_2" : 4 }, { "var_1" : 2, "var_2" : 6 }, { "var_1" : 3 }, { "var_1" : 4 }]

Before I could've run the code, I had to put self as an argument of your sample_insert function.

edited Apr 5, 2018 at 15:56

Azzabi Haythem

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answered Apr 5, 2018 at 14:59

Jiří Mauritz

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