How do you pass multiple objects to go template?

Question

Most examples I can find describe very simple/basic things, such as showing attributes of a person object like this:

The name is {{.Name}}. The age is {{.Age}}.

What happens if you have a more complicated web page, for example, multiple different objects and lists of objects, i.e. How do you do something like this:

{{p.Name}} is aged {{p.Age}}. 
Outstanding invoices {{invoices.Count}} 

<table>
<tr><td>{{invoices[0].number}}</td></tr>
.... etc...

Answer 1

You can declare and pass in an anonymous struct like this:

templ.Execute(file, struct {
    Age int
    Name string
}{42, "Dolphin"})

and access the variables like:

{{.Age}}, {{.Name}}

While this still requires you to make a struct, it is among the most concise ways to do it. You'll have to decide if it is too ugly for you ;)

Answer 2

You can put your more complex data into struct, and pass it just like you did Name and Age. For example,

type vars struct {
    P User
    Invoices []Invoice
}

type User struct {
    Name string
    Age int
}

type Invoice {
    Number int
    Description string
}

If you pass an instance of vars into the template execution, you can reference sub-structures by using dots and array indexes, just like in regular go code.

{{.P.Name}}, {{.P.Age}}, {{.Invoices[0].Number}}