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templatesgo
Ivan Bukharin
Ivan Bukharin

Reputation: 331

Get all keys from map in Golang Template without use vars

I have something map by . (point symbol) and I want to print just every key. I know we can use some:

{{ range $key, $value := . }}{{ $key }}{{end}}

But I cant use var, because I use Docker Compose file which problem withi symbol $.

How I can print all keys without use vars?

Upvotes: 1

Views: 2973

Answers (1)

Kenny Grant
Kenny Grant

Reputation: 9633

Extract the keys and sort them, then feed them into the view, as iterating a map has indeterminate order anyway (which you don’t want). 

import "sort"

var m map[int]string
var keys []int
for k := range m {
    keys = append(keys, k)
}
sort.Ints(keys)

Within a range loop, use . to refer to the items being ranged. A new context is created for that loop. 

{{ range . }}
  {{ . }}
{{ end }}

However I suggest you fix the problem with using the symbol $, you will want to use that. That sounds like the wrong use of Docker Compose files - you could put your golang templates into separate files, or into the go source files themselves if you want a single binary deploy.

Upvotes: 2

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