用于多个站点的HTML模板

Question

I'm preparing an application that will serve several different sites that have a common admin panel (a page with different themes to simplify).

Each of these "themes" will have different needs. For example while all of them show a list of services, some of them will show an associated image too. For the ones who don't I would prefer to avoid the DB calls to fetch them (different logic to render the pages).

In Laravel (a PHP framework) this would be a perfect use for view composers.

What would be the design of such a system in go?

I was thinking in some kind of "hooks" that each theme can register to run functions to fetch and add data for a specific template. There's a better way to do it?

Answer 1

If you pass a list of service objects to the template, you could easily decide inside the template what you want to show. If you decide to show a service's image, you could call the ServiceObject.ImageURL() (which would then lead to a database call). If you're not calling this function, there will be no database query issued.

A sample using the pongo2 template engine:

{% for service in services %}
    {% if page.theme == "simple" %}
        <p>We don't show any image in the simple theme.</p>
    {% else %}
        {# This would lead to a database call and return the image path #}
        <img src="{{ service.ImageURL() }}" />
    {% endif %}
{% endfor %}

Another idea would be to simply create an individual template per theme (extending the common base template); you don't have check for the theme inside the template then.