cobra | My implementation of classic game using Panda3D game engine | Game Engine library

I've just recently started working with Go, and I've run into some behavior working with Cobra and Viper that I'm not sure I understand.

This is a slightly modified version of the sample code you get by running cobra init. In main.go I have:

I have this dataframe

I'm working with DataGrip and sqlite. I have a table suppliers and another named products :

I am trying to add a delete function to my project. so I can remove objects from the database without using the admin page.

I'm getting this error when I try to render 'exercise_detail.html'

Reverse for 'exercise_delete' with arguments '('',)' not found. 1 pattern(s) tried: ['exercise/(?P[^/]+)/delete/$']

models.py

I try execute

I could not build up the solution how to find the previous element without specific pattern.

Description: In the select option below is a simple Select box. The parent items have no - or dash, and the parents are created, then the children option values, so always, the children option values have greater value than parent value.

I am trying to find the parent value if a element is selected, if the element selected is parent, then return the parent value.

This is simple and obvious problem but I could not figure out the problem, if anyone could show how to get the above.

The html is from CMS - Drupal the html can not be changed

The sketch below is a command line application written using Cobra and Go. I'd like to throw an error if the value of flag1 doesn't match the regex ^\s+\/\s+. How do I do that?

I am trying to sign another public key using gpg --sign-key which then errors with signing failed: No secret key

Full output:

I am following this guide.