How do you delete an embedded document using Mongoengine?

Question

I have a collection that has an EmbeddedDocumentField. I'm having trouble finding examples of how to delete an embedded document from the collection. Can someone provide me with an example or reference to one?

Here is what my setup looks like:

• Python 2.7.5
• Django 1.5.5
• MongoEngine 0.8.7

Code:

class Merchant(Document):
    merchant_id = StringField(max_length=50)
    merchant_name = StringField(max_length=150)
    merchant_name_search_alias = StringField(max_length=150)
    website = StringField(max_length=150)
    location = ListField(EmbeddedDocumentField(Location))
    address = StringField(max_length=50)
    city = StringField(max_length=30)
    state = StringField(max_length=20)
    zipcode = IntField()
    phone_nummber = StringField(max_length=10)
    sub_lat = FloatField()
    sub_lng = FloatField()
    country = StringField(max_length=20)
    promotion = ListField(EmbeddedDocumentField(Promotion))


class Promotion(EmbeddedDocument):
    provider_name = StringField(max_length=50)
    provider_website = URLField()
    promo_name = StringField(max_length=300)
    promo_name_search_alias = StringField(max_length=100)
    retail_price = DecimalField(precision=2, force_string=True)
    discount_price = DecimalField(precision=2, force_string=True)
    deal_url = URLField()
    buy_url = URLField()
    deal_image_url = URLField()
    description = StringField(max_length=1000)
    start_at = DateTimeField()
    end_at = DateTimeField()
    category = StringField(max_length=50)
    dq_category = StringField(max_length=50)
    keywords = StringField(max_length=100)

Answer 1

You can $unset a field using MyDoc.objects.update(unset__myField=1) Or using $pull to remove a single value from a list eg: MyDoc.objects.update(pull__myField=Value)

See: https://docs.mongoengine.org/guide/querying.html?highlight=unset#atomic-updates