Look into performance of Tastypie

[KasperBrandt]

We should look into the Tastypie API and see whether it causes some of RSR's performance issues.

[damienallen]

Calls to the old API can result in unfiltered queries for all projects and/or users. The following line is one likely source (akvo/api/fields.py line 98):

foreign_obj = getattr(bundle.obj, self.attribute)

[KasperBrandt]

Test plan

• Compare the /api/v1/ output to the one from Live/UAT/Test, it should contain the same fields, definitely for the project and project_update endpoints. (One exception: offset is not supported in DRF, so that has been removed)
  • For format=xml
  • For format=json
  • Check that format=html (default) also reflects the same data as the other outputs. This was not supported before by Tastypie, but should still show the same data.
• Check that the /api/v1/right_now_in_akvo/?format=json returns the same as before on Test/UAT/Live (see Replicate right_now_in_akvo API endpoint in the DRF API #1636).