GRMustache: variable tag that renders a dynamic partial

_documentation.md

Documentation of rendering objects: https://github.com/groue/GRMustache/blob/master/Guides/rendering_objects.md

base.mustache

{{#items}}
  - {{link}}
{{/items}}

movie_link.mustache

<a href="{{url}}">{{title}}</a>

person_link.mustache

<a href="{{url}}">{{firstName}} {{lastName}}</a>

render.m

id data = @{
    @"items": @[
        @{  // movie
            @"url": @"/movies/123",
            @"title": @"Citizen Kane",
            @"link": [GRMustacheTemplate templateFromResource:@"movie_link" bundle:nil error:NULL],
        },
        @{  // director
            @"url": @"/people/321",
            @"firstName": @"Orson",
            @"lastName": @"Welles",
            @"link": [GRMustacheTemplate templateFromResource:@"person_link" bundle:nil error:NULL],
        }
    ]
};

NSString *rendering = [GRMustacheTemplate renderObject:data
                                          fromResource:@"base"
                                                bundle:nil
                                                 error:NULL];

rendering.html

- <a href="/movies/123">Citizen Kane</a>
- <a href="/people/321">Orson Welles</a>