feat: add functionality to manually add ingredients; implement CreateIngredientDto and update RecipesController and RecipesService

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

@@ -0,0 +1,16 @@
+import { IsString, IsNumber, IsOptional } from 'class-validator';
+
+export class CreateIngredientDto {
+  @IsNumber()
+  productId: number;
+
+  @IsNumber()
+  quantity: number;
+
+  @IsString()
+  unit: string;
+
+  @IsOptional()
+  @IsString()
+  note?: string;
+}

backend/src/recipes/recipes.controller.ts

@@ -2,6 +2,7 @@ import { Body, Controller, Delete, Get, HttpCode, Param, ParseIntPipe, Post, Pat
 import { IsString } from 'class-validator';
 import { RecipesService } from './recipes.service';
 import { CreateRecipeDto } from './dto/create-recipe.dto';
+import { CreateIngredientDto } from './dto/create-ingredient.dto';
 import { ParseMarkdownDto } from './dto/parse-markdown.dto';
 import { CurrentUser } from '../auth/decorators/current-user.decorator';
 import { ShareRecipeDto } from './dto/share-recipe.dto';
@@ -77,6 +78,15 @@ export class RecipesController {
     return this.recipesService.updateImage(id, dto.sourceUrl, user.userId);
   }
 
+  @Post(':id/ingredients')
+  async addIngredient(
+    @Param('id', ParseIntPipe) id: number,
+    @Body() ingredient: CreateIngredientDto,
+    @CurrentUser() user: { userId: number },
+  ) {
+    return this.recipesService.addIngredient(id, ingredient, user.userId);
+  }
+
   @Patch(':id/visibility')
   async setVisibility(
     @Param('id', ParseIntPipe) id: number,

backend/src/recipes/recipes.service.ts

@@ -4,6 +4,7 @@ import * as fs from 'node:fs/promises';
 import * as path from 'node:path';
 import { PrismaService } from '../prisma/prisma.service';
 import { CreateRecipeDto } from './dto/create-recipe.dto';
+import { CreateIngredientDto } from './dto/create-ingredient.dto';
 import { ParseMarkdownDto } from './dto/parse-markdown.dto';
 import { downloadAndOptimizeImage } from '../common/utils/download-image';
 import { parseRecipeMarkdown, ParsedRecipe, ParsedIngredient } from '../common/utils/recipe-parser';
@@ -475,6 +476,25 @@ export class RecipesService {
     }
   }
 
+  async addIngredient(id: number, ingredient: CreateIngredientDto, userId: number) {
+    const recipe = await this.findRecipeByIdOrThrow(id);
+    await this.assertRecipeOwnedByUser(recipe, userId, id);
+    await this.assertProductsActive([ingredient.productId]);
+
+    return this.prisma.recipeIngredient.create({
+      data: {
+        productId: ingredient.productId,
+        quantity: ingredient.quantity,
+        unit: ingredient.unit,
+        note: ingredient.note || null,
+        recipeId: id,
+      },
+      include: {
+        product: { include: { nutrition: true } },
+      },
+    });
+  }
+
   async parseMarkdown(dto: ParseMarkdownDto) {
     // Delegera markdown-parsning till microservice-importer
     const importerUrl = process.env.IMPORTER_SERVICE_URL || 'http://importer-api:3001';