generated.go does not compile; undefined: gqlparser

[sateeshpnv]

What happened?

While migrating from v0.10.2 to v0.11.3, generated.go doesn't compile (It used to work absolutely fine under v0.10.2):

/private/var/tmp/_bazel_sateesh/.../sandbox/darwin-sandbox/1531/execroot/__main__/bazel-out/darwin-fastbuild/bin/src/.../generated.go:4521:20: undefined: gqlparser

generated.go does not import github.com/vektah/gqlparser/v2. However, generated!.gotpl region uses it - var parsedSchema = gqlparser.MustLoadSchema(sources...)

generated!.gotpl does have {{ reserveImport "github.com/vektah/gqlparser/v2" }}.

Looking through gqlgen code, there is code to prune - formatted, err := imports.Prune(filename, b, packages). config.Packages.packages does not have github.com/vektah/gqlparser/v2. Couldn't see why gqlparser/v2/ast is present in packages, but not gqlparser/v2.

What did you expect?

Expected generated.go to compile; to import the package that is indeed used in the generated!.gotpl region of the file.

Minimal graphql.schema and models to reproduce

versions

• gqlgen version? v0.11.3
• go version? v1.14.4
• dep or go modules? go mod in a bazel project

[sateeshpnv]

Suspected that there was an alias name mismatch - v2 instead of gqlparser.

Could get it working by adding alias in gqlgen/codegen/generated!.gotpl. However, am clueless how it fails only for me. Need help to find this out so that we can use it without the below patch.

Probable special scenarios are a) it is used in a bazel based project and b) code generated using gqlgen/api package instead of go run.

Patch:

diff --git a/codegen/generated!.gotpl b/codegen/generated!.gotpl
index 03be286e..76768c72 100644
--- a/codegen/generated!.gotpl
+++ b/codegen/generated!.gotpl
@@ -8,7 +8,7 @@
 {{ reserveImport "errors"  }}
 {{ reserveImport "bytes"  }}

-{{ reserveImport "github.com/vektah/gqlparser/v2" }}
+{{ reserveImport "github.com/vektah/gqlparser/v2" "gqlparser" }}
 {{ reserveImport "github.com/vektah/gqlparser/v2/ast" }}
 {{ reserveImport "github.com/99designs/gqlgen/graphql" }}
 {{ reserveImport "github.com/99designs/gqlgen/graphql/introspection" }}

[sateeshpnv]

Closing the issue now that the PR was merged. However, still don't know how only I faced the original issue.