Make amount for an ingredient optional.

frontend/src/components/recipes/IngredientListEditor.tsx

@@ -3,25 +3,48 @@ import type {IngredientModel} from "../../models/IngredientModel"
 import Button from "../basics/Button"
 import {ButtonType} from "../basics/BasicButtonDefinitions"
 
-/**
- * Editor for handling the ingredient list
- * Ingredients can be edited, added and removed
- */
+
 type IngredientListEditorProps = {
     ingredients: IngredientModel[]
     onChange: (ingredients: IngredientModel[]) => void
 }
 
+/**
+ * Editor for handling the ingredient list
+ *
+ * Ingredients can be edited, added and removed
+ * @param ingredient List of IngredientModels describing the ingredient
+ * @param onChange Method to call on changing an ingredient.
+ */
 export function IngredientListEditor({ingredients, onChange}: IngredientListEditorProps) {
-    const handleUpdate = (index: number, field: keyof IngredientModel, value: string | number) => {
-        const updated = ingredients.map((ing, i) =>
-            i === index ? {...ing, [field]: field === "amount" ? Number(value) : value} : ing
-        )
-        onChange(updated)
+    const handleUpdate = (
+        index: number,
+        field: keyof IngredientModel,
+        value: string | number | undefined
+    ) => {
+        const updated = ingredients.map((ing, i) => {
+            if (i !== index) return ing;
+
+            if (field === "amount") {
+                // Handle optional numeric value
+                if (value === undefined || value === "") {
+                    const {amount, ...rest} = ing; // remove the field
+                    return rest as IngredientModel;
                 }
 
+                // valid number
+                return {...ing, amount: Number(value)};
+            }
+
+            // handle other fields normally
+            return {...ing, [field]: value};
+        });
+
+        onChange(updated);
+    };
+
     const handleAdd = () => {
-        onChange([...ingredients, {name: "", amount: 0, unit: ""}])
+        onChange([...ingredients, {name: "", unit: ""}])
     }
 
     const handleRemove = (index: number) => {
@@ -36,8 +59,11 @@ export function IngredientListEditor({ingredients, onChange}: IngredientListEdit
                         type="number"
                         className="input-field"
                         placeholder="Menge"
-                        value={ing.amount}
-                        onChange={e => handleUpdate(index, "amount", e.target.value)}
+                        value={ing.amount === undefined || ing.amount === null ? "" : ing.amount}
+                        onChange={e => {
+                            const value = e.target.value;
+                            handleUpdate(index, "amount", value === "" ? undefined : Number(value));
+                        }}
                     />
                     <input
                         className="input-field w-20"

frontend/src/components/recipes/RecipeDetailPage.tsx

@@ -58,7 +58,7 @@ export default function RecipeDetailPage() {
             ...ingGrp,
             ingredientList: ingGrp.ingredientList.map((ing) => ({
                 ...ing,
-                amount: ing.amount * factor,
+                amount: ing.amount !== undefined ? ing.amount * factor : ing.amount,
             }))
         }))
 
@@ -121,7 +121,7 @@ export default function RecipeDetailPage() {
                                 <ul className="default-list">
                                     {group.ingredientList.map((ing, j) => (
                                         <li key={j}>
-                                            {ing.amount} {ing.unit ?? ""} {ing.name}
+                                            {ing.amount ?? ""} {ing.unit ?? ""} {ing.name}
                                         </li>
                                     ))}
                                 </ul>

frontend/src/mappers/RecipeMapper.ts

@@ -40,7 +40,7 @@ export function mapRecipeDtoToModel(dto: RecipeDto): RecipeModel {
                     .map(ing => ({
                         id: ing.id,
                         name: ing.name ?? "", // @todo ensure that name and amount are indeed present
-            amount: ing.amount ?? 0,
+                        amount: ing.amount,
                         unit: ing.unit,
                         //subtext: ing.subtext ?? undefined,
                     })),

frontend/src/models/IngredientModel.ts

@@ -7,7 +7,7 @@ export interface IngredientModel {
     name: string
 
     /** Quantity required (e.g. 200, 1.5) */
-  amount: number
+    amount?: number
 
     /** Unit of measurement (e.g. "g", "tbsp", "cups").
      *  Optional for cases like "1 egg".