How to use UUID as _id

[GorillaGroddUK]

I want to use UUID for the _id value, but I can't get Mongo to recognise the value.

I start by setting uuidRepresentation='standard' parameter when initiating the MongoClient connection.

In my schema I declare a UUID attribute; this seemed to have no effect:

uuid = fields.UUIDField(
	attribute='_id',
	default=uuid.uuid4,
	unique=True,
	)

Result: 
{
  "_id": {
    "$oid": "625aadba5d4a05bfa5c6b26b"
  },
}

Declaring the attribute as a string, the result is the same:

uuid = fields.StringField(
	attribute='_id',
	default=str(uuid.uuid4()),
	unique=True,
	)

Result: 
{
  "_id": {
    "$oid": "625aaad798ceb63062a2c15c"
  },
}

What am I doing wrong?

[vlad-watcher]

If you want your UUID to be as _id, you need :

1. create some field in document
2. specify that this field is primary_key

`uuid = fields.StringField(
	attribute='_id',
	default=str(uuid.uuid4()),
	unique=True,
        primary_key=True
	)

Result: 
{
  "_id": {
    "$oid": "625aaad798ceb63062a2c15c"
  },
}`

Then this field value will be stored as _id of your object
I hope this will work for you

[GorillaGroddUK]

Thanks for the assistance. I've now worked out the problem - when I use inheritance umongo/Mongo ignores my attribute:

@instance.register
class SeedModel(Document):
    glossary_uuid = fields.UUIDField(
        required=True,
        )

    class Meta:
        abstract = True

class SeriesModel(SeedModel):
    uuid = fields.UUIDField(
        attribute='_id',
        default=uuid.uuid4(),
        unique=True,
        primary_key=True,
        )
    class Meta:
        collection_name = "things"

_new_series = SeriesModel()
Result:
{
	"_id": {
		"$oid": "62603f8ed4f3d3fedd273e4b"
	},
}

If SeriesModel inherits directly from Document then the result is as I originally desired - an UUID value for the _id :

class SeriesModel(Document):
    uuid = fields.UUIDField(
        attribute='_id',
        default=uuid.uuid4(),
        unique=True,
        primary_key=True,
        )
    class Meta:
        collection_name = "things"

_new_series = SeriesModel()
Result:
{
	"_id": {
		"$binary": "R/2Me/GtQBCmV/eR/oBw5Q==",
		"$type": "4"
	},
}

Is this the correct behaviour for inheritance, or is there another parameter I need to set in order to use inheritance?

Cheers

[whophil]

I don't know if it is related to this issue, but

default=uuid.uuid4()

should probably be

default=uuid.uuid4

See #373 #374