How Can I Pass Multiple Data Objects to a Go Template?

Passing Multiple Data to a Go Template

In Go, when populating a template, you can pass a single value, which can be a composite value such as a struct, map, or slice.

To pass multiple data objects to a template:

Using a Struct:

Create a struct that embeds the desired data objects as exported fields:

type Data struct {
    Results []User // MongoDB query result
    Other   []int  // Integer array
}

Pass the struct to the template execution:

data := &Data{results, []int{1, 2, 3}}
if err := GetTemplate("list").Execute(w, data); err != nil {
    // Handle error
}

In the template:

{{range .Results}}
    User name: {{.Name}}
{{end}}

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

Using a Map:

Create a map with the data objects as key-value pairs:

m := map[string]interface{}{
    "Results": results,
    "Other":   []int{1, 2, 3},
}

Pass the map to the template execution:

if err := GetTemplate("list").Execute(w, m); err != nil {
    // Handle error
}

In the template:

{{range .Results}}
    User name: {{.Name}}
{{end}}

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

Using a Slice:

While less readable, you can also pass a slice of interface{}:

s := []interface{}{
    results,
    []int{1, 2, 3},
}

Pass the slice to the template execution:

if err := GetTemplate("list").Execute(w, s); err != nil {
    // Handle error
}

In the template:

{{range index . 0}}
    User name: {{.Name}}
{{end}}

Other: {{index . 1}}

Note: Custom functions or channels can also be used to pass multiple data objects, but are considered less conventional practices.

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