How Can I Pass Multiple Data Objects to Go Templates?

Passing Multiple Data to Go Templates

Template execution in Go allows you to pass a single value, but this value can be a composite type containing multiple components. This offers several options for passing and accessing various data objects in the template.

Composite Value Using Struct:

Create a custom struct data type encapsulating the desired data:

type Data struct {
    Results []User
    Other   []int
}

Assign the data and execute the template:

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

In the template, access the MongoDB results as {{.Results}} and the integer array as {{.Other}}.

Composite Value Using Map:

Alternatively, create a map containing the data:

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

Pass the map to the template and access the data using dot notation: {{.Results}} for results and {{.Other}} for the integer array.

Composite Value Using Slice:

A less readable approach is to use a slice containing the data:

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

Index the template data to access the components: {{index . 0}} for results and {{index . 1}} for the integer array.

Additional Notes:

Remember that the data type must be exported to be accessible in the template.

Consider using a struct or map to improve readability and maintainability.

Other approaches exist but are less practical for this specific scenario.

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