Creating queries in Paris ORM - sql

Question

I have a collection of Recipes and each one contains Categories. This are my models:
class Recipe extends \Model {
public static $_table = "recipe";
public function categories() {
return $this->has_many_through('Category');
}
}
class Category extends \Model {
public static $_table = "category";
public function categories() {
return $this->has_many_through('Recipe');
}
}
And the table to relate both:
class CategoryRecipe extends \Model {
public static $_table = "category_recipe";
}
Now I need to create a query to get all the Recipes that are under one/more categories. What is the way to achieve this? I want to avoid making things like this:
$results = $app['paris']->getModel('CategoryRecipe')
->where_in("category_id",$selected_categories)
->find_many();
foreach($results as $result) {
$recipe = $app['paris']->getModel('Recipe')
->where('id',$result->recipe_id)
->find_one();
var_dump($receta->name);
}
Create filters? functions inside the models? Is not possible to make it more elegant?

Answer 1

That is pretty much how I would do it, but you can optimise in one way. Add relation functions to your linking/many-to-many table. Then instead of doing that extra query in your foreach loop you simply do:
foreach($results as $result) {
$recipe = $result->recipe()->find_one();
var_dump($recipe)
}
So your CategoryRecipe model might look like:
class CategoryRecipe extends \Model {
public static $_table = "category_recipe";
public function recipe() {
$this->belongs_to('Recipe', 'recipe_id');
}
public function category() {
$this->belongs_to('Category', 'category_id');
}
}
I haven't tested this code, but it should be what you're after I think.