Storage engine: Mongo DB support

[SoulPancake]

Checklist

• I agree to the terms within the OpenFGA Code of Conduct.

Describe the problem you'd like to have solved

We are creating an authz server using openfga and want to use mongodb for persisting, is that support likely to be built anytime soon? Or if any other NoSQL options will be supported. Is there a reason why support for mongo wasn't thought of as an initial approach?
Also would like to know if there is any other hack for using it.

Describe the ideal solution

Ideal solution would be to have mongodb as a storage engine option
https://openfga.dev/docs/getting-started/setup-openfga/configure-openfga#:~:text=OpenFGA%20supports%20multiple,a%20new%20version.

Alternatives and current workarounds

We might use a POSTGRES connection if this is not supported.

Additional context

No response

[aaguiarz]

Thanks for the suggestion @SoulPancake!

It's unlikely that we'll prioritize this work anytime soon

[SoulPancake]

@aaguiarz I was building it myself on a fork, would you perhaps be interested in accepting a contribution with the support?

[aaguiarz]

Hi @SoulPancake

That's great to hear. We are not accepting contributions of database adapters for now, as don't have enough expertise to maintain them. We'll be looking into a plugin model to make that possible in the future.

There are other companies that are taking the approach of maintaining their own fork with their own DB adapter (eg https://github.com/criteo-forks/openfga for MS SQL).

Let us know if you end up using it in production with Mongo and you open source your fork :)

[SoulPancake]

Cool that sounds good @aaguiarz