How to Pass Multiple Data Objects to a Go Template?

Passing Multiple Data Objects to Go Template

Introduction
Enhancing the functionality of Go templates often involves passing multiple data objects to them. This allows us to display complex data structures in our templates.

Data Composition for Template Data
To pass multiple data objects, we can compose them into a single value:

Using a Struct
Create a struct with exported fields for the data objects:

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

Example:

data := &Data{results, []int{1, 2, 3}}

Using a Map
Create a map with string keys for named data values:

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

Example:

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

Accessing Data in Templates
In the template, we can access the composed data:

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

{{range $key, $val := .Results}}
    {{$key}}: {{$val.Name}}
{{end}}

{{.Other}}

Example Execution

GetTemplate("list").Execute(w, data)
GetTemplate("list").Execute(w, m)

Alternative Approaches
While the above methods are widely used, other options include:

• Passing data through channels
• Registering custom functions

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