Most Alchemy classes inherit from the Base class, so the getModel() method is almost always available. In the controller you'd do something like this:

var Blog = Function.inherits('Alchemy.Controller.App', function Blog(conduit) {
    Blog.super.call(this, conduit); 
});

Blog.setAction(async function index(conduit) {
    
    var blog_model = this.getModel('Blog');
    
    var posts = await blog_model.find('all');
    
    this.set('posts', posts);
    this.render('blog/index');
});

In this specific case you wouldn't even need to do this, as the Blog model will already be available in the Blog controller under the model property.