Null input for slice should convert to nil rather than a empty slice

[NateScarlet]

What happened?

gqlgen always make a slice if field is set, even it set to null.

gqlgen/codegen/type.gotpl

Lines 20 to 27 in 0eef2fe

	res := make([]{{$type.GO.Elem | ref}}, len(vSlice))
	for i := range vSlice {
	res[i], err = ec.{{ $type.Elem.UnmarshalFunc }}(ctx, vSlice[i])
	if err != nil {
	return nil, err
	}
	}
	return res, nil

#1023 mentioned this as a question, but i believe this is a bug.

What did you expect?

got nil for fields that set to null.

Minimal graphql.schema and models to reproduce

type Item {
  name: String!
}

type Query{
   items(name: [String!]): [Item!]
}

query {
  items(name: null) {
    name  
  }
}

versions

• gqlgen version? v0.11.3
• go version? 1.14
• dep or go modules? go modules

[lwc]

Fixed via: #1242