Modelgeneration hook breaks federation schema

[m-barrera]

What happened?

I was using the model generation hook in order to a additional tag to the model structs.
which worked absolutley fine. Even starting the federated schema service no complains from go.

When starting the apollo gateway following message was thrown:
Error checking for changes to service definitions: Couldn't load service definitions for "user" at http://localhost:4001: internal system error This data graph is missing a valid configuration. Couldn't load service definitions for "user" at http://localhost:4001: internal system error

Then Go told me following
interface conversion: interface {} is fedruntime.Service, not model.Service

Running normal model generation

After running the normal model generation the schema worked again
and was recognized by the apollo gateway.

Manually adding the struct tag

I know it should not be done but I wanted to test it, so
I wrote the additional tag to the structs and magically it worked.
Also the gateway recognized the federated schema.

versions

• gqlgen version?
  v0.13.0
• go version?
  go1.15.5
• dep or go modules?
  go modules