Question

I have a structure like the following and am trying to remove one item from the array. I have not been able to figure this out so far. Any suggestions?

{
   "_id" : "4fd4466c03644ec6ec6d5fe1",
   "fruit" : [

         { "id" : "4fd4466c03644ec6ec6d5fdf", "name" : "avocado", "quantity" : "2"  },
         { "id" : "4fd4466c03644ec6ec6d5fe0", "name" : "apple",   "quantity" : "34" },

   ]
}

I have a model of “cart” that has an embedded document called “fruit”. Yes they are bogus examples, but it’s simpler to explain a cart of fruit than what I am working on. The furthest I got with the calls.

MorphiaQuery q = Cart.q().filter("_id",cartid);
Cart.o().removeAll("fruit", ?????).update(q);

Any guidance would be awesome here.

Answer 1

First find out the Cart from which you want to remove one fruit:

Cart cart = Cart.findById(cartid);

Second locate the fruit and remove it:

for (Fruit f: cart.fruit) {
    if (f.name.equals("apple")) {
        cart.fruit.remove(f);
        cart.save();
        break;
    }
}