Trying to create a Restful API

[John Polling]

I'm very new to Scala and Scalatra.  I'm slowly getting my head around it all.

I'm creating a restful API with a MongoDB.  I'm using JackonJSON to help with JSON parsing etc, however I'm finding that any ObjectId's aren't being output by the API.  I just a blank value, however if I println the values they exist within the object, so I'm certain it's a deserialization issue?

Thanks

John

[Stefan Ollinger]

Hi,
can you paste the classes you want to (de-)serialize along with your code?

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[John Polling]

Sure thing.

I've put it up here - https://gist.github.com/pollingj/5619969

Thanks

John

[Stefan Ollinger]

Hi,

there are different options you have:

  - create a JValue manually with either Json4s' Extraction.decompose or salat's grater
  - return the Milestone and let Scalatra's render pipeline handle the conversion (calls Extraction.decompose internally)

In the case that you use Json4s, you need to add a custom serializer, so that Json4s knows how to handle ObjectId instances.

Here is a sample: https://gist.github.com/dozed/5631680

Regards,
Stefan

[Stefan Ollinger]

Also Json4s already has a mongo module, which you can use. It is called: json4s-mongo
You need to add it to your project dependencies. I updated the gist.

[John Polling]

Thanks so much for this Stefan.

Learning lots and fast :)