feat: add servings field to Recipe model and implement inventory comparison functionality

backend/src/recipes/dto/create-recipe.dto.ts

@@ -1,12 +1,12 @@
 import {
   IsArray,
-  IsOptional,
-  IsString,
-  ValidateNested,
-  ArrayMinSize,
   IsInt,
   IsNumber,
+  IsOptional,
+  IsString,
   Min,
+  ValidateNested,
+  ArrayMinSize,
 } from 'class-validator';
 import { Type } from 'class-transformer';
 
@@ -42,6 +42,11 @@ export class CreateRecipeDto {
   @IsString()
   imageUrl?: string;
 
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  servings?: number;
+
   @IsArray()
   @ArrayMinSize(1)
   @ValidateNested({ each: true })

backend/src/recipes/recipes.service.ts

@@ -295,7 +295,7 @@ export class RecipesService {
       include: {
         ingredients: {
           include: {
-            product: true,
+            product: { include: { nutrition: true } },
           },
         },
       },
@@ -308,7 +308,7 @@ export class RecipesService {
       include: {
         ingredients: {
           include: {
-            product: true,
+            product: { include: { nutrition: true } },
           },
         },
       },
@@ -343,6 +343,7 @@ export class RecipesService {
         name: updateRecipeDto.name,
         description: updateRecipeDto.description || null,
         instructions: updateRecipeDto.instructions || null,
+        servings: updateRecipeDto.servings ?? null,
         ...(updateRecipeDto.imageUrl !== undefined && { imageUrl: updateRecipeDto.imageUrl || null }),
         ingredients: {
           create: updateRecipeDto.ingredients.map((ingredient) => ({
@@ -356,7 +357,7 @@ export class RecipesService {
       include: {
         ingredients: {
           include: {
-            product: true,
+            product: { include: { nutrition: true } },
           },
         },
       },
@@ -389,7 +390,7 @@ export class RecipesService {
     return this.prisma.recipe.update({
       where: { id },
       data: { imageUrl },
-      include: { ingredients: { include: { product: true } } },
+      include: { ingredients: { include: { product: { include: { nutrition: true } } } } },
     });
   }
 
@@ -411,6 +412,7 @@ export class RecipesService {
         description: createRecipeDto.description || null,
         instructions: createRecipeDto.instructions || null,
         imageUrl,
+        servings: createRecipeDto.servings ?? null,
         ingredients: {
           create: createRecipeDto.ingredients.map((ingredient) => ({
             productId: ingredient.productId,
@@ -423,7 +425,7 @@ export class RecipesService {
       include: {
         ingredients: {
           include: {
-            product: true,
+            product: { include: { nutrition: true } },
           },
         },
       },