use Model instances instead of MappingType instances

[Rizziepit]

Is there a reason we are not using the MappingType.to_object method to convert to model instances, e.g. https://github.com/universalcore/springboard/blob/develop/springboard/views.py#L63?

I want to prevent future issues when schemas change.

[Rizziepit]

@miltontony @smn is this issue valid?

[smn]

No, the only reason that's not used is because when this was writing the only option available was to either hit Git or work with whatever ES returned.

[smn]

So, yes, this issue is valid :)