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mongodbhaskellyesodpersistent
netom
netom

Reputation: 3362

_id field with persistent-mongodb

I'm building a web application in yesod with mongodb.

I'm tryign to create a model called Message:

Message _id Text threadKey Text body Text

But I can't seem to access the _id field this way, the message_id function doesn't get created, unlike messageThreadKey and messageBody.

How can I access the _id field of mongo objects from yesod/persistent-mongoDB?

Upvotes: 0

Views: 226

Answers (1)

Gareth Charnock
Gareth Charnock

Reputation: 1166

In persistent the id (in both the SQL version and the Mongo version) is special and not actually part of the model record. The combination of a Id and a Model Record is called an Entity.

I would reread the persistent chapter of the Yesod book under the Manipulation section, Insert subsection.

http://www.yesodweb.com/book/persistent

Upvotes: 1

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