Tutorial 6: De API uitbreiden

Nu al onze data uit een echte database komt, gaan we kijken hoe we zelf nieuwe data kunnen toevoegen via de API. We kijken hiervoor naar de HTTP POST methode, hoe we deze kunnen testen met Postman en hoe we data kunnen valideren die de gebruiker invoert.

https://tweakers.net/advertorials/onlinejavaacademy2/tutorial6/

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Extra toevoeging op Products.java is de annotatie "@SiZe(min=1)" bij de property name

Author: vincentKool

src/main/java/tutorial/api/controllers/ProductController.java

@@ -24,4 +24,10 @@ public Product show(@PathVariable("productId") long productId) {
         return productRepository.findOne(productId);
     }
 
+    @RequestMapping(value="/products", method = RequestMethod.POST)
+    public void insert(@RequestParam("name") String name,
+                       @RequestParam("price") BigDecimal price) {
+        Product product = new Product(name, price);
+        productRepository.save(product);
+    }
 }

src/main/java/tutorial/api/controllers/ProductListController.java

@@ -1,12 +1,11 @@
 package tutorial.api.controllers;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestMethod;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
+import tutorial.persistence.models.Product;
 import tutorial.persistence.models.ProductList;
 import tutorial.persistence.repositories.ProductListRepository;
+import tutorial.persistence.repositories.ProductRepository;
 
 import java.util.List;
 
@@ -15,6 +14,8 @@ public class ProductListController extends ApiController {
 
     @Autowired
     ProductListRepository productListRepository;
+    @Autowired
+    ProductRepository productRepository;
 
     @RequestMapping(value="/lists", method= RequestMethod.GET)
     public List<ProductList> showAll() {
@@ -26,4 +27,19 @@ public ProductList show(@PathVariable("productListId") long productListId) {
         return productListRepository.findOne(productListId);
     }
 
+    @RequestMapping(value = "/lists", method = RequestMethod.POST)
+    public void insert(@RequestParam("name") String name) {
+        ProductList productList = new ProductList(name);
+        productListRepository.save(productList);
+    }
+
+    @RequestMapping(path = "/lists/{listId}/products", method = RequestMethod.POST)
+    public void addProduct(@PathVariable("listId") long listId,
+                           @RequestParam("productId") long productId) {
+        ProductList productList = productListRepository.findOne(listId);
+        Product product = productRepository.findOne(productId);
+
+        productList.getProducts().add(product);
+        productListRepository.save(productList);
+    }
 }

src/main/java/tutorial/api/controllers/advices/ExceptionHandlingControllerAdvice.java

@@ -0,0 +1,29 @@
+package tutorial.api.controllers.advices;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+import javax.servlet.http.HttpServletResponse;
+import javax.validation.ConstraintViolation;
+import javax.validation.ConstraintViolationException;
+import java.io.IOException;
+import java.util.ArrayList;
+
+@ControllerAdvice
+public class ExceptionHandlingControllerAdvice {
+
+    @ResponseStatus(value= HttpStatus.BAD_REQUEST)
+    @ExceptionHandler(ConstraintViolationException.class)
+    public void error(ConstraintViolationException exception,
+                      HttpServletResponse response) throws IOException {
+        ArrayList<String> messages = new ArrayList<>();
+
+        for (ConstraintViolation violation : exception.getConstraintViolations()) {
+            messages.add(violation.getPropertyPath().toString() + ": " + violation.getMessage());
+    }
+    response.sendError(HttpStatus.BAD_REQUEST.value(), String.join(", ", messages));
+    }
+
+}

src/main/java/tutorial/persistence/models/Product.java

@@ -3,6 +3,9 @@
 import com.fasterxml.jackson.annotation.JsonBackReference;
 
 import javax.persistence.*;
+import javax.validation.constraints.DecimalMin;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
 import java.math.BigDecimal;
 import java.util.List;
 
@@ -14,9 +17,13 @@ public class Product {
     private long id;
 
     @Column(nullable=false)
+    @NotNull
+    @Size(min=1)
     private String name;
 
     @Column(nullable=false)
+    @NotNull
+    @DecimalMin(value="0")
     private BigDecimal price;
 
     @ManyToMany(mappedBy="products")

src/main/java/tutorial/persistence/models/ProductList.java

@@ -3,6 +3,8 @@
 import com.fasterxml.jackson.annotation.JsonManagedReference;
 
 import javax.persistence.*;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
 import java.util.List;
 
 @Entity
@@ -13,6 +15,8 @@ public class ProductList {
     private long id;
 
     @Column(nullable=false)
+    @NotNull
+    @Size(min=5)
     private String name;
 
     @ManyToMany