How to remove a item from a list(ListField) by id in MongoEngine?

Question

structure：

{title: 'test', comments: [{id:1, title: ''}, {id: 8, title: ''}]}

i need remove the id=8 item, thanks.

Answer 1

Hi you can pull items from an array:

https://github.com/hmarr/mongoengine/blob/master/mongoengine/queryset.py

See $pull: http://www.mongodb.org/display/DOCS/Updating#Updating-%24pull

Answer 2

You need to use $pull operator here :

http://www.mongodb.org/display/DOCS/Updating#Updating-%24pull

db.collection.update({'title':'test'},{$pull : { 'comments' : { 'id' : 8 }});