Cleanly catching NotUniqueErrors with fields

[James Clemence]

So,

I have a fairly simple model which constrains on a particular owner only having a monkey with one name:

    class Monkey(mongoengine.Document):

        name = mongoengine.StringField(unique_with='owner')

        owner = mongoengine.ReferenceField(User)

This works fine to enforce the constraint, however I then have issues in the following situation. When I try to insert a second Monkey for the same user with the same name, I get a NotUniqueError, however this gives me a broad message, and doesn't enable me to analyse which field raised the error

NotUniqueError: Tried to save duplicate unique keys (E11000 duplicate key error index: test.feed.$name_1_owner_1 dup key: { : "Bob", : { $ref: "user", $id: ObjectId('5145b8a28dd4ff1c5281d151') } })

I can of course parse the error message for the offending issue, discovering that test.feed.$name_1_owner_1 was the issue, and then pass on a nicer error message to the client, however this seems quite clunky. Is there a way to catch this exception on a per-field basis?

Thanks!

[Ross Lawley]

Hi,

The error is coming back because its the index that is catching and throwing back the error, currently just the raw error is thrown.  Perhaps a cleaner exception could be raised, if you can write a parser that will cleanly identify the fields then, I'd be happy to add that to mongoengine.

Ross

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