having filter guards call controller method causes issues when resource is sideloaded

[Dishwasha]

Unless the controller method used for a filter guard exists on all controllers a resource could be sideloaded from, using a guard on an allow_filter will break when the filtered resource is fetched through sideloading. Since changing jsonapi_compliable to call guard on resource rather than controller will created a backwards incompatible change, I'm reporting the issue rather than attempting to fix it.

[thec0keman]

Just want to piggy back here that guards on the resource make a lot more sense.

The docs do indicate 'runtime context', but the example is a bit misleading.