MealIngredientContract.java

    @NonNull
    private String getShoppingListQuery(List<Meal> meals) {
        StringBuffer sb = new StringBuffer();
        sb.append("select name, count(name) from (");

        for (int i = 0; i < meals.size(); i++) {

            sb.append(getIngredientsQuery());

            if (i < meals.size() - 1) {
                sb.append(" union all ");
            }
        }

        sb.append(") group by name order by name collate nocase;");
        return sb.toString();
    }