I am trying to display a list gym classes (Yoga, Pilates etc). For each class type there are several classes, so I want to group all the Yoga classes, and all the Pilates classes and so on.
I made this function to take a slice and make a map of it
func groupClasses(classes []entities.Class) map[string][]entities.Class {
classMap := make(map[string][]entities.Class)
for _, class := range classes {
classMap[class.ClassType.Name] = append(classMap[class.ClassType.Name], class)
}
return classMap
}
The problem is now how can I iterate through it, according to http://golang.org/pkg/text/template/, you need to access it in .Key format, I don't know the keys (unless I also passed a slice of keys into the template). How do I unpack this map in my view.
All I have currently is
{{ . }}
which displays something like:
map[Pilates:[{102 PILATES ~/mobifit/video/ocen.mpg 169 40 2014-05-03 23:12:12 +0000 UTC 2014-05-03 23:12:12 +0000 UTC 1899-12-30 00:00:00 +0000 UTC {PILATES Pilates 1 2014-01-22 21:46:16 +0000 UTC} {1 [email protected] password SUPERADMIN Lee Brooks {Male true} {1990-07-11 00:00:00 +0000 UTC true} {1.85 true} {88 true} 2014-01-22 21:46:16 +0000 UTC {0001-01-01 00:00:00 +0000 UTC false} {0001-01-01 00:00:00 +0000 UTC false} {0001-01-01 00:00:00 +0000 UTC false}} [{1 Mat 2014-01-22 21:46:16 +0000 UTC}]} {70 PILATES ~/mobifit/video/ocen.mpg 119 66 2014-03-31 15:12:12 +0000 UTC 2014-03-31 15:12:12 +0000 UTC 1899-12-30 00:00:00 +0000 UTC
This question is related to
go
go-templates
Check the Variables section in the Go template docs. A range may declare two variables, separated by a comma. The following should work:
{{ range $key, $value := . }}
<li><strong>{{ $key }}</strong>: {{ $value }}</li>
{{ end }}
As Herman pointed out, you can get the index and element from each iteration.
{{range $index, $element := .}}{{$index}}
{{range $element}}{{.Value}}
{{end}}
{{end}}
Working example:
package main
import (
"html/template"
"os"
)
type EntetiesClass struct {
Name string
Value int32
}
// In the template, we use rangeStruct to turn our struct values
// into a slice we can iterate over
var htmlTemplate = `{{range $index, $element := .}}{{$index}}
{{range $element}}{{.Value}}
{{end}}
{{end}}`
func main() {
data := map[string][]EntetiesClass{
"Yoga": {{"Yoga", 15}, {"Yoga", 51}},
"Pilates": {{"Pilates", 3}, {"Pilates", 6}, {"Pilates", 9}},
}
t := template.New("t")
t, err := t.Parse(htmlTemplate)
if err != nil {
panic(err)
}
err = t.Execute(os.Stdout, data)
if err != nil {
panic(err)
}
}
Output:
Pilates
3
6
9
Yoga
15
51
Playground: http://play.golang.org/p/4ISxcFKG7v
Source: Stackoverflow.com