fix: Improve child-doc resolver Performance

[fahimalizain]

Preface

• get_cached_doc was being called for each and every document being handled by gql-resolver be it child-doc or normal-doc.
• get_cached_doc works as indented - loads from db on first call, serves from cache on second call
• permission check is not required for child docs.
• Number of db calls on a single get_doc is huge

Observations

Before & After

Query:

{
  Users(first: 100) {
    pageInfo {
      hasNextPage hasPreviousPage startCursor endCursor
    }
    totalCount
    edges {
      cursor
      node {
        full_name
        email
        roles {
          role__name
        }
      }
    }
  }
}

Before:

After:

Significant drop in number of queries can be observed.
There is a lot more room for improvements - let this be the first step 😄

[Abadulrehman]

💯

[fahimalizain]

https://gqlgen.com/reference/dataloaders/
This is where we should be headed 👀

[e-lobo]

https://gqlgen.com/reference/dataloaders/ This is where we should be headed 👀

https://github.com/syrusakbary/aiodataloader
this maybe..

[fahimalizain]

The dataloader implementations I have seen requires ASGI 🙆🏼‍♂️

[e-lobo]

ahh hence the await i was wondering about that..

[fahimalizain]

Related: #53

[fahimalizain]

@e-lobo found a bug with __ignore_perms
will continue working with this PR adding a basic test-suite for document_resolver.py

[Abadulrehman]

💯