Smart SequenceField

[lig]

Add value_decorator into SequenceField to allow post processing of the calculated counter value.

Test and doc included.

[ddorian]

Can't you just override the save method?

[lig]

@ddorian I do not see how it is possible to achieve by overriding save method.

class MyDoc(Document):
    id = SequenceField(primary_key=True)
    def save(self, *args, **kwargs):
        self.id = str(self.id)
        Document.save(self, *args, **kwargs)

This will not do the trick because SequenceField can store integers only now.

class MyDoc(Document):
    id = StringField(primary_key=True)
    num_id = SequenceField()
    def save(self, *args, **kwargs):
        self.id = str(self.num_id)
        Document.save(self, *args, **kwargs)

This will work but I think that this code is much harder to support.

[lig]

Also I need to mention that this pull-request has backward incompatible change. There is no min_value/max_value support now. But I strongly believe that these parameters make no sense for SequenceField.

[rozza]

Thanks marked for 0.8

[rozza]

Merged into 0.8 branch in 99fe1da

Thanks for the code @lig

[coveralls]

Changes Unknown when pulling 4be37bf on lig:smart-sequence-field into * on MongoEngine:master*.