python - How to fetch foreign key relationships in mongoengine -

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i have following 2 models.

class url(mongoengine.document):     codes = mongoengine.listfield(mongoengine.intfield(required=true),                verbose_name='codes')     name = mongoengine.stringfield(max_length=255, required=true)  class bytesforurl(mongoengine.document):     url = mongoengine.referencefield(url)     value = mongoengine.floatfield(required=true)     timestamp = mongoengine.datetimefield(required=true)

i need data of bytesforurl given url name within time range. how query that.

bytes = mongo_models.bytesforurl.objects(timestamp__gte=from_time,                                                   timestamp__lte=to_time, )  byte in bytes:     print byte.value, byte.timestamp

but how pass value url. help?

you can use this

urls = mongo_models.url.objects.filter(name=name) bytes = mongo_models.bytesforurl.objects.filter(             timestamp__gte=from_time,             timestamp__lte=to_time, url__in=urls)

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