How to check for returned value from .Resources.GetMatch?

support
1

I’m trying to use an image page resource for thumbnail generation. If there’s no image with such name, then fallback to another image.

{{ $thumb := .Resources.GetMatch "thumb.*" }}

{{ if not $thumb }}
    {{ $thumb := .Resources.GetMatch "0.*" }}
{{ end }}

{{ $thumb := $thumb.Resize "500x" }}

Apparently, this is not the way to do it as I don’t get the fallback image (0.jpg) if thumb.jpg is missing.

Either this is not the right way to check if $thumb contains a resource, or whatever happens inside the conditional statement is not usable outside of it.

Any tips? Thanks in advance.

2

Spot on. This will be fixed in Go 1.11, but until then you need to use .Scratch (search the docs).

1 Like
3

Thanks, I’d read something about it but thought it’s irrelevant for “custom” page variables.

For anybody interested - not sure this is the way to use .Scratch but here’s what worked for me:

{{ $thumb := .Resources.GetMatch "thumb.*" }}
{{ .Scratch.Set "thumbscratch" $thumb }}

{{ if not $thumb }}
    {{ $thumb := .Resources.GetMatch "0.*" }}
    {{ .Scratch.Set "thumbscratch" $thumb }}
{{ end }}

{{ $thumb := .Scratch.Get "thumbscratch" }}

{{ $thumb := $thumb.Resize "500x" }}
4

Based on the glob examples for the library that hugo uses for .GetMatch, it should be possible to replace that whole thing with:

{{ with .Resources }}
    {{ with .GetMatch "{thumb.*,0.*}" }}
        {{ $thumb := .Resize "500x" }}
        <!-- more stuff -->
    {{ end }}
{{ end }}

I like to use with as much as possible.

4 Likes
5

Wow, this looks so much better! And yes, it does work.