Can't get number as Grafana variable

[Severin-S]

Describe the bug

Trying to set a Grafana variable to the value of a Redis key fails with the following error if the value only contains digits.

Validation
Cannot use 'in' operator to search for 'fields' in NaN

Templating [query0]
Error updating options: Cannot use 'in' operator to search for 'fields' in NaN

Version

Grafana version 7.5.5
Redis plugin version 1.4.0

Steps to reproduce

1. Execute SET tmp "1" in Redis
2. Create a new Dashboard in Grafana
3. Add a variable
4. Set GET tmp as query

Setting tmp to 1 instead of "1" leads to the same error. When adding any non digit (e.g. "1 ") to the string, the error does not occur.

Expected behavior

The Grafana variable should be set to the value of the Redis key regardless wether it only contains digits or not.

Screenshots

[mikhail-vl]

@Severin-S thank you for reporting the issue. If the string contains a number, then it's converted to a number for graphs. Unfortunately, I have not tried it for variables recently, using strings in variables for my projects.
I will check how to fix it and get back to you shortly.

[mikhail-vl]

@Severin-S the issue is fixed for Grafana 7. Grafana 8 returns result differently and works without the fix.
You can test using the latest Docker build: https://redisgrafana.github.io/development/images/
I am planning to release version 1.5.0 with the fix over the weekend.