gqlgen command does not work with go gqlgen

Event

--I was using gqlgen to implement GraphQL with go

• https://github.com/99designs/gqlgen --The command go run github.com/99designs/gqlgen [args] written in the README could or could not be executed.

Occurrence condition

--If the version of go written in the go.mod file is 1.12 or less, it will probably work even if you follow the README. --People with go version 1.13 or higher in the go.mod file will probably get an error if run after go mod vendor

Workaround

-- $ GOPATH / bin / gqlgen should probably have been generated at the stage of go get github.com/99designs/gqlgen --Can be executed with gqlgen [args]. (The path should be in $ GOPATH / bin)

Finally

--go run [package] is confusing because the place to refer to changes depending on the place to execute (in $ GOPATH or not), the version of go.mod, and whether ./vendor exists. --The go module behaves differently before 1.12 and after 1.13, so it seems better to upgrade the version quickly.