update

client/src/components/ProductForm.tsx

 import { IProduct } from "@/containers/Products";
-import { Box, Button, Grid, TextField } from "@mui/material";
-import { ChangeEvent, FormEvent, useState } from "react";
+import { Box, Button, Grid, SelectChangeEvent, TextField } from "@mui/material";
+import { ChangeEvent, FormEvent, useCallback, useEffect, useState } from "react";
 import { FileInput } from "./UI/Form/FileInput";
+import CategorySelect, { ICategory } from "./UI/Form/CategorySelect";
+import { axiosApiClient } from "@/helpers/axiosApiClient";
 
 
 interface Props {
@@ -9,13 +11,24 @@ interface Props {
 }
 
 export function ProductForm({onProductFormSubmit}: Props) {
+  const [categories, setCategories] = useState<ICategory[] | null>(null);
   const [product, setProduct] = useState<Omit<IProduct, "id">>({
     description:"",
     price:0,
     title:"",
-    image:""
+    image:"",
+    categoryId: ""
   });
 
+  const getCategories = useCallback(async () => {
+    const {data} = await axiosApiClient.get('/category')
+    return data
+  }, [])
+
+  useEffect(() => {
+    getCategories().then(res => setCategories(res))
+  }, [getCategories])
+
   const submitFormHandler = (e: FormEvent<HTMLFormElement>) => {
     e.preventDefault();
 
@@ -48,6 +61,11 @@ export function ProductForm({onProductFormSubmit}: Props) {
       }
   }
 
+  const handleChangeSelect = (event: SelectChangeEvent) => {
+    const val = event.target.value as string
+    setProduct(prevState => ({...prevState, categoryId: val}))
+  }
+
   return <Box 
       component={"form"} 
       autoComplete="off" 
@@ -95,6 +113,14 @@ export function ProductForm({onProductFormSubmit}: Props) {
             label="image"
           />
         </Grid>
+        <Grid item xs>
+          <CategorySelect
+            handleChange={handleChangeSelect}
+            value={product.categoryId}
+            label="Category"
+            categories={categories || []}
+          />
+        </Grid>
         <Grid item xs>
           <Button type="submit" color="primary" variant="contained">
             Create

client/src/components/UI/Form/CategorySelect.tsx

+import { FormControl, InputLabel, Select, MenuItem, SelectChangeEvent } from "@mui/material"
+
+export interface ICategory {
+    id: string
+    title: string
+    description: string
+}
+
+type TProps = {
+    handleChange: (event: SelectChangeEvent) => void
+    value: string
+    label: string
+    categories: ICategory[]
+}
+
+const CategorySelect = ({handleChange, value, label, categories}: TProps) => {
+    return (
+        <FormControl fullWidth>
+            <InputLabel id="demo-simple-select-label">{label}</InputLabel>
+            <Select
+                labelId="demo-simple-select-label"
+                id="demo-simple-select"
+                value={value}
+                label={label}
+                onChange={handleChange}
+            >
+                {
+                    categories.map(item => (
+                        <MenuItem key={item.id} value={item.id}>{item.title}</MenuItem>
+                    ))
+                }
+            </Select>
+        </FormControl>
+    )
+}
+
+export default CategorySelect
\ No newline at end of file

client/src/containers/ProductItem.tsx

@@ -8,18 +8,18 @@ import {
   IconButton,
   Typography,
 } from '@mui/material';
-import { IProduct } from './Products';
 import { ArrowForward } from '@mui/icons-material';
 import { Link } from 'react-router-dom';
+import { IProductState } from '@/features/productsSlice';
 
 interface Props {
-  product: IProduct;
+  product: IProductState;
 }
 
 const apiUrl = 'http://localhost:8000'
 
 export function ProductItem({ product }: Props) {
-  const { title, price, id, description, image } = product;
+  const { title, price, id, description, image, category } = product;
   let cardImage = `${apiUrl}/uploads/unnamed.png`
 
   if(image && image !== '') {
@@ -29,7 +29,7 @@ export function ProductItem({ product }: Props) {
   return (
     <Grid item xs={12} sm={12} md={6} lg={4}>
       <Card sx={{ minWidth: 275 }}>
-        <CardHeader title={title} />
+        <CardHeader title={`Категория: ${category.title} - ${title}`} />
         <CardMedia
          image={cardImage}
          title={title}

client/src/containers/Products.tsx

@@ -41,5 +41,6 @@ export interface IProduct {
   title: string;
   description: string;
   price: number;
-  image: string
+  image: string;
+  categoryId: string
 }

client/src/features/productsSlice.ts

 import { createAsyncThunk, createSlice } from "@reduxjs/toolkit";
-import { IProduct } from "@/containers/Products";
 import { axiosApiClient } from "../helpers/axiosApiClient";
+import { ICategory } from "@/components/UI/Form/CategorySelect";
+import { IProduct } from "@/containers/Products";
+
+export interface IProductState {
+  id: string;
+  title: string;
+  description: string;
+  price: number;
+  image: string;
+  category: ICategory
+}
 
 interface State {
-  products: IProduct[];
+  products: IProductState[];
   error: Error | null;
   loading: boolean;
 }
@@ -15,7 +25,7 @@ const initialState: State = {
 };
 
 export const fetchProducts = createAsyncThunk('fetch/products', async () => {
-  return await axiosApiClient.get<IProduct[]>('/products').then(res => res.data);
+  return await axiosApiClient.get<IProductState[]>('/products').then(res => res.data);
 });
 
 export const createProduct = createAsyncThunk('create/product', 

server/package-lock.json

@@ -11,6 +11,7 @@
       "dependencies": {
         "@types/multer": "^1.4.11",
         "class-transformer": "^0.5.1",
+        "class-validator": "^0.14.1",
         "cors": "^2.8.5",
         "express": "^4.18.2",
         "multer": "^1.4.5-lts.1",
@@ -499,6 +500,11 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/validator": {
+      "version": "13.12.0",
+      "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.12.0.tgz",
+      "integrity": "sha512-nH45Lk7oPIJ1RVOF6JgFI6Dy0QpHEzq4QecZhvguxYPDwT8c93prCMqAtiIttm39voZ+DDR+qkNnMpJmMBRqag=="
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-6.21.0.tgz",
@@ -1070,6 +1076,16 @@
       "resolved": "https://registry.npmjs.org/class-transformer/-/class-transformer-0.5.1.tgz",
       "integrity": "sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw=="
     },
+    "node_modules/class-validator": {
+      "version": "0.14.1",
+      "resolved": "https://registry.npmjs.org/class-validator/-/class-validator-0.14.1.tgz",
+      "integrity": "sha512-2VEG9JICxIqTpoK1eMzZqaV+u/EiwEJkMGzTrZf6sU/fwsnOITVgYJ8yojSy6CaXtO9V0Cc6ZQZ8h8m4UBuLwQ==",
+      "dependencies": {
+        "@types/validator": "^13.11.8",
+        "libphonenumber-js": "^1.10.53",
+        "validator": "^13.9.0"
+      }
+    },
     "node_modules/cli-highlight": {
       "version": "2.1.11",
       "resolved": "https://registry.npmjs.org/cli-highlight/-/cli-highlight-2.1.11.tgz",
@@ -2360,6 +2376,11 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/libphonenumber-js": {
+      "version": "1.11.5",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.11.5.tgz",
+      "integrity": "sha512-TwHR5BZxGRODtAfz03szucAkjT5OArXr+94SMtAM2pYXIlQNVMrxvb6uSCbnaJJV6QXEyICk7+l6QPgn72WHhg=="
+    },
     "node_modules/locate-path": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
@@ -4038,6 +4059,14 @@
       "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
       "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg=="
     },
+    "node_modules/validator": {
+      "version": "13.12.0",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
+      "integrity": "sha512-c1Q0mCiPlgdTVVVIJIrBuxNicYE+t/7oKeI9MWLj3fh/uq2Pxh/3eeWbVZ4OcGW1TUf53At0njHw5SMdA3tmMg==",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",

server/package.json

@@ -15,6 +15,7 @@
   "dependencies": {
     "@types/multer": "^1.4.11",
     "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
     "cors": "^2.8.5",
     "express": "^4.18.2",
     "multer": "^1.4.5-lts.1",

server/src/appDataSource.ts

 import { DataSource } from "typeorm";
 import { Product } from "./entities/product.entity";
+import { Category } from "./entities/category.entity";
 
 export const AppDataSource = new DataSource({
     type: "postgres",
@@ -7,8 +8,8 @@ export const AppDataSource = new DataSource({
     port: 5432,
     username: "postgres",
     password: "root",
-    database: "classwork",
-    schema: "classwork",
+    database: "postgres",
+    schema: "public",
     synchronize: true,
-    entities: [Product]
+    entities: [Product, Category]
 })
\ No newline at end of file

server/src/controllers/category.controller.ts

+import { CategoryDto } from '@/dto/category.dto';
+import { CategoryService } from '@/services/category.service';
+import { plainToInstance } from 'class-transformer';
+import { RequestHandler } from 'express';
+
+export class CategoryController {
+  private service: CategoryService;
+
+  constructor() {
+    this.service = new CategoryService();
+  }
+
+  getAllCategories: RequestHandler = async (req, res): Promise<void> => {
+    const categories = await this.service.getAllCategories();
+    res.send(categories);
+  };
+
+  getCategory: RequestHandler = async (req, res): Promise<void> => {
+    const category = await this.service.getCategory(req.params.id);
+    res.send(category);
+  };
+
+  createCategory: RequestHandler = async (req, res): Promise<void> => {
+    const categoryDto = plainToInstance(CategoryDto, req.body);
+    const Category = await this.service.createCategory(categoryDto);
+    res.send(Category);
+  };
+}

server/src/controllers/product.controller.ts

@@ -2,6 +2,7 @@ import { ProductService } from '@/services/product.service';
 import { RequestHandler } from 'express';
 import { plainToInstance } from 'class-transformer';
 import { ProductDto } from '@/dto/product.dto';
+import { formatErrors } from '@/helpers/formatErrors';
 
 export class ProductController {
   private service: ProductService;
@@ -15,15 +16,23 @@ export class ProductController {
     res.send(products);
   };
 
-  getProduct: RequestHandler = (req, res): void => {
-    const product = this.service.getProduct(req.params.id);
+  getProduct: RequestHandler = async (req, res): Promise<void> => {
+    const product = await this.service.getProduct(req.params.id);
     res.send(product);
   };
 
-  createProduct: RequestHandler = (req, res): void => {
-    const productDto = plainToInstance(ProductDto, req.body);
-    if (req.file) productDto.image = req.file.filename;
-    const product = this.service.createProduct(productDto);
-    res.send(product);
+  createProduct: RequestHandler = async (req, res): Promise<void> => {
+    try {
+      const productDto = plainToInstance(ProductDto, req.body);
+      if (req.file) productDto.image = req.file.filename;
+      const product = await this.service.createProduct(productDto);
+      res.send(product);
+    } catch (e) {
+      if (Array.isArray(e)) {
+        res.status(400).send(formatErrors(e));
+      } else {
+        res.status(500).send(e);
+      }
+    }
   };
 }

server/src/dto/category.dto.ts

+import { Expose } from 'class-transformer';
+
+export class CategoryDto {
+  @Expose() title!: string;
+
+  @Expose() description!: string;
+}

server/src/dto/product.dto.ts

 import { Expose } from 'class-transformer';
+import { IsNotEmpty, IsNumberString, IsOptional, IsString } from 'class-validator';
 
 export class ProductDto {
-  @Expose() title!: string;
+  @IsNotEmpty({ message: 'Продукт не может быть создан без названия!' })
+  @IsString({ message: 'Название должно быть строкой' })
+  @Expose()
+  title!: string;
 
-  @Expose() description!: string;
+  @IsOptional()
+  @Expose() 
+  description!: string;
 
-  @Expose() price!: number;
+  @IsNotEmpty({ message: 'Укажите цену продукта' })
+  @IsNumberString({}, { message: 'Укажите корректную цену' })
+  @Expose() 
+  price!: number;
 
-  @Expose() image!: string;
+  @IsOptional()
+  @Expose() 
+  image!: string;
+
+  @IsNotEmpty({ message: 'Не указана категория товара' })
+  @IsNumberString({}, { message: 'Укажите корректную категорию' })
+  @Expose() 
+  categoryId!: string;
 }

server/src/entities/category.entity.ts

+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
+import { Product } from "./product.entity";
+
+@Entity({name: 'categories'})
+export class Category {
+    @PrimaryGeneratedColumn()
+    id!: number;
+
+    @Column()
+    title!: string
+
+    @Column()
+    description!: string
+
+    @OneToMany(() => Product, (product) => product.category)
+    products!: Product[]
+}
\ No newline at end of file

server/src/entities/product.entity.ts

-import { Entity, PrimaryGeneratedColumn, Column } from "typeorm";
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from "typeorm";
+import { Category } from "./category.entity";
 
 @Entity()
 export class Product {
@@ -16,4 +17,7 @@ export class Product {
 
     @Column({nullable: true})
     image!: string
+
+    @ManyToOne(() => Category, (category) => category.products)
+    category!: Category
 }
\ No newline at end of file

server/src/helpers/formatErrors.ts

+import { ValidationError } from "class-validator";
+
+export const formatErrors = (errors: ValidationError[]) => {
+    const updatedErrors: { type: string; messages: string[] }[] = [];
+  
+    errors.forEach((e) => {
+      if (e.constraints) {
+        const error = {
+          type: e.property,
+          messages: Object.values(e.constraints),
+        };
+        updatedErrors.push(error);
+      }
+    });
+    return updatedErrors;  
+};
\ No newline at end of file

server/src/index.ts

+import { CategoryRoute } from './routes/category.route';
 import cors from 'cors';
 import App from './app';
 import logger from './middlewares/logger';
@@ -7,7 +8,7 @@ import { ProductRoute } from './routes/product.route';
 const app = new App({
   port: 8000,
   middlewares: [logger(), cors()],
-  controllers: [new ArticleRoute(), new ProductRoute()],
+  controllers: [new ArticleRoute(), new ProductRoute(), new CategoryRoute()],
 });
 
 app.listen();

server/src/repositories/category.repository.ts

+import { AppDataSource } from "@/appDataSource";
+import { CategoryDto } from "@/dto/category.dto";
+import { Category } from "@/entities/category.entity";
+import { Repository } from "typeorm";
+
+class CategoryRepo {
+    private repo: Repository<Category>
+
+    constructor() {
+        this.repo = AppDataSource.getRepository(Category)
+    }
+
+    async create(body: CategoryDto) {
+        return await this.repo.save(body)
+    }
+
+    async getAll() {
+        return await this.repo.find()
+    }
+
+    async getOne(id: number) {
+        return await this.repo.findOne({where: {id: id}})
+    }
+}
+
+export const categoryRepo = new CategoryRepo()
\ No newline at end of file

server/src/repositories/product.repository.ts

@@ -2,6 +2,7 @@ import { AppDataSource } from "@/appDataSource";
 import { ProductDto } from "@/dto/product.dto";
 import { Product } from "@/entities/product.entity";
 import { Repository } from "typeorm";
+import { categoryRepo } from "./category.repository";
 
 class ProductRepo {
     private repo: Repository<Product>
@@ -11,11 +12,14 @@ class ProductRepo {
     }
 
     async create(body: ProductDto) {
-        return await this.repo.save(body)
+        const category = await categoryRepo.getOne(parseInt(body.categoryId))
+        if(!category) throw Error('Category Not Found.')
+        
+        return await this.repo.save({...body, category: category})
     }
 
     async getAll() {
-        return await this.repo.find()
+        return await this.repo.find({relations: {category: true}})
     }
 
     async getOne(id: number) {

server/src/routes/category.route.ts

+import { CategoryController } from '@/controllers/category.controller';
+import { Router } from 'express';
+
+export class CategoryRoute {
+  public path = '/category';
+  public router = Router();
+  private controller: CategoryController;
+
+  constructor() {
+    this.controller = new CategoryController();
+    this.init();
+  }
+
+  private init() {
+    this.router.get('/', this.controller.getAllCategories);
+    this.router.get('/:id', this.controller.getCategory);
+    this.router.post('/create',this.controller.createCategory);
+  }
+}

server/src/services/category.service.ts

+import { CategoryDto } from "@/dto/category.dto";
+import { Category } from "@/entities/category.entity";
+import { categoryRepo } from "@/repositories/category.repository";
+
+
+export class CategoryService {
+  getAllCategories = async (): Promise<Category[]> => {
+    return await categoryRepo.getAll()
+  };
+
+  getCategory = async (id: string): Promise<Category | null> => {
+    return await categoryRepo.getOne(parseInt(id))
+  };
+
+  createCategory = async (data: CategoryDto): Promise<Category> => {
+    return await categoryRepo.create(data)
+  };
+}

server/src/services/product.service.ts

 import { ProductDto } from '@/dto/product.dto';
 import { productRepo } from '@/repositories/product.repository';
 import { Product } from '@/entities/product.entity';
+import { validate } from 'class-validator';
 
 export class ProductService {
   getAllProducts = async (): Promise<Product[]> => {
@@ -12,6 +13,8 @@ export class ProductService {
   };
 
   createProduct = async (data: ProductDto): Promise<Product> => {
-    return productRepo.create(data)
+    const errors = await validate(data, { whitelist: true });
+    if (errors.length) throw errors;
+    return await productRepo.create(data)
   };
 }