Add nutrients per serving methods to Recipe

app/Models/IngredientAmount.php

@@ -84,6 +84,11 @@ class IngredientAmount extends Model
 
     /**
      * Get the multiplier for the ingredient unit based on weight.
+     *
+     * Unit weight will be specified for ingredients that are added by unit
+     * (e.g. eggs, vegetables, etc.) and cup weight (the weight of the
+     * ingredient equal to one cup) will be specified for ingredients that are
+     * measured (e.g. flour, milk, etc.).
      */
     private function unitMultiplier(): float {
         return match ($this->unit) {

app/Models/Recipe.php

@@ -53,33 +53,61 @@ class Recipe extends Model
     }
 
     /**
-     * Get total recipe calories.
+     * Get total calories.
      */
     public function caloriesTotal(): float {
         return $this->sumNutrient('calories');
     }
 
     /**
-     * Get total recipe protein.
+     * Get per serving calories.
+     */
+    public function caloriesPerServing(): float {
+        return $this->caloriesTotal() / $this->servings;
+    }
+
+    /**
+     * Get total protein.
      */
     public function proteinTotal(): float {
         return $this->sumNutrient('protein');
     }
 
     /**
-     * Get total recipe fat.
+     * Get per serving protein.
+     */
+    public function proteinPerServing(): float {
+        return $this->proteinTotal() / $this->servings;
+    }
+
+    /**
+     * Get total fat.
      */
     public function fatTotal(): float {
         return $this->sumNutrient('fat');
     }
 
     /**
-     * Get total recipe carbohydrates.
+     * Get per serving fat.
+     */
+    public function fatPerServing(): float {
+        return $this->fatTotal() / $this->servings;
+    }
+
+    /**
+     * Get total carbohydrates.
      */
     public function carbohydratesTotal(): float {
         return $this->sumNutrient('carbohydrates');
     }
 
+    /**
+     * Get per serving carbohydrates.
+     */
+    public function carbohydratesPerServing(): float {
+        return $this->carbohydratesTotal() / $this->servings;
+    }
+
     /**
      * Sum a specific nutrient for all ingredient amounts.
      *