FieldValue

from mongofire import MongoDB, FieldValue
db = MongoDB('myAppDatabase')

increment

To increment field value, use the following example:

db.collection('users').document('user_id').update({
    'age': FieldValue.increment(1),
})

decrement

To decrement field value, use the following example:

db.collection('users').document('user_id').update({
    'salary': FieldValue.decrement(200),
})

push

To add items to field value, use the following example:

db.collection('users').document('user_id').update({
    'searchKeywords': FieldValue.push(['google', 'facebook']),
})

pull

To delete items from field value, use the following example:

db.collection('users').document('user_id').update({
    'searchKeywords': FieldValue.pull(['google']),
})

add_to_set

To add items to a field value and ensure that there are no duplicate items, use the following example:

db.collection('users').document('user_id').update({
    'searchKeywords': FieldValue.add_to_set({'google'}),
})

This will add the keyword google to the searchKeywords field if it does not exist otherwise it will be ignored