Template variable not updating

Hello @marcusolsson, first of all: Useful plugin, thanks!

I encountered an issue.

Scenario The JSON plugin is used to define a template variable json-var. Inside the “Fields” tab, another template variable var (e.g. of type “Custom”) is used: $.mapping[?(@.attr == '$var')].something.

Expected behavior json-var is always updated when var is updated.

Actual behavior json-var isn’t updated when var is updated. Only once during creation of json-var it is initialized correctly according to var.

Environment Grafana 7.5 Neither changing “Refresh” option nor “Cache Time” solves the issue.

Basically, I would like to use a template variable inside the “Field” configuration of the “Fields” tab. How can I get it working?

[ugoleleux]

@mlcdf

@ugoleleux: not all heroes wear capes. Thank you for the workaround, it works great!

I’m glad it helped you, I spent so much time discovering this workaround. 😃

[ugoleleux]

@marcusolsson https://github.com/marcusolsson/grafana-json-datasource/issues/216#issuecomment-992540623 I just updated the closed issue, but here is my entry again on this case : I found a new behavior that will help you in your analysis. I have a variable $name that contains a list of choices. This variable is used inside a child variable on the Params tab :

When I look at the dependency tree, the $name var is not used by $child

If I refer $name variable in the Path tab :

This time, the dependency tree is well seeing the relation.

By doing this little change, my child var is now updated on the fly when I modify the $name.

I hope this will help you to correct this issue 😃

Regards Ugo