Tested documenation example from go1.15-1.18, get nil pointer dereference

[dmitridb]

Hello;

When attempting to build the example in the documentation with latest version of the go compiler ( go 1.18 ):

$ go run main.go
2022/03/30 10:59:32 RegisterViewPathError: github.com/qor/admin/views not found!

[2022-03-30 10:59:32] [info] registering callback `qor_admin:composite_primary_key` from /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/composite_primary_key_callback.go:34

[2022-03-30 10:59:32] [info] registering callback `qor_admin:composite_primary_key` from /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/composite_primary_key_callback.go:39
Listening on: 9000
2022/03/30 10:59:38 Finish [GET] /admin Took 0.06ms
2022/03/30 10:59:38 http: panic serving 127.0.0.1:59800: runtime error: invalid memory address or nil pointer dereference
goroutine 20 [running]:
net/http.(*conn).serve.func1()
        /usr/lib/go/src/net/http/server.go:1825 +0xbf
panic({0x988a40, 0xd66080})
        /usr/lib/go/src/runtime/panic.go:844 +0x258
html/template.(*Template).escape(0x0)
        /usr/lib/go/src/html/template/template.go:97 +0x34
html/template.(*Template).Execute(0x0, {0xacd480, 0xc0002ea380}, {0x9ed260, 0xc00040f420})
        /usr/lib/go/src/html/template/template.go:121 +0x32
github.com/qor/admin.(*Context).Execute(0xc00040f420, {0x9f66dd?, 0x0?}, {0x0?, 0x0})
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/context.go:227 +0x2d9
github.com/qor/admin.(*Controller).Dashboard(0x969380?, 0xc0004378c0?)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/controller.go:28 +0x2c
github.com/qor/admin.(*Admin).NewServeMux.func2(0xc00040f420, 0x9d4480?)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/route.go:197 +0x183
github.com/qor/admin.Middleware.Next(...)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/route.go:38
github.com/qor/admin.(*Admin).NewServeMux.func1(0xc00040f420, 0xc0004401a0)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/route.go:187 +0x1d3
github.com/qor/admin.Middleware.Next(...)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/route.go:38
github.com/qor/admin.Admin.registerCompositePrimaryKeyCallback.func1(0xc00040f420, 0xc00032f760)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/composite_primary_key_callback.go:27 +0x1f1
github.com/qor/admin.(*serveMux).ServeHTTP(0x7f8c659912e8?, {0xacf6c0?, 0xc0002ea380}, 0xc0001c5a00)
        /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/route.go:288 +0x94f
net/http.(*ServeMux).ServeHTTP(0x0?, {0xacf6c0, 0xc0002ea380}, 0xc0001c5a00)
        /usr/lib/go/src/net/http/server.go:2462 +0x149
net/http.serverHandler.ServeHTTP({0xc00042fe90?}, {0xacf6c0, 0xc0002ea380}, 0xc0001c5a00)
        /usr/lib/go/src/net/http/server.go:2916 +0x43b
net/http.(*conn).serve(0xc00043e320, {0xacf948, 0xc00042fda0})
        /usr/lib/go/src/net/http/server.go:1966 +0x5d7
created by net/http.(*Server).Serve
        /usr/lib/go/src/net/http/server.go:3071 +0x4db

Same results tested back to go 1.16

Go 1.15 (Debian 11 from package) works:

$ go run main.go
# github.com/mattn/go-sqlite3
sqlite3-binding.c: In function ‘sqlite3SelectNew’:
sqlite3-binding.c:129019:10: warning: function may return address of local variable [-Wreturn-local-addr]
129019 |   return pNew;
       |          ^~~~
sqlite3-binding.c:128979:10: note: declared here
128979 |   Select standin;
       |          ^~~~~~~

[2022-03-30 12:51:59] [info] registering callback `qor_admin:composite_primary_key` from /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/composite_primary_key_callback.go:34

[2022-03-30 12:51:59] [info] registering callback `qor_admin:composite_primary_key` from /home/dmitridb/go/pkg/mod/github.com/qor/[email protected]/composite_primary_key_callback.go:39
Listening on: 9000
2022/03/30 12:52:22 Finish [GET] /admin Took 3.84ms

What's missing?