added add favoirte method to services and tests

src/main/java/ntnu/idatt2016/v233/SmartMat/entity/Recipe.java

 package ntnu.idatt2016.v233.SmartMat.entity;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
@@ -48,5 +49,32 @@ public class Recipe {
     @ManyToMany(mappedBy = "recipes")
     @JsonIgnoreProperties({"recipes"})
     List<User> users;
-    
+
+
+    /**
+     * Adds a product to the recipe
+     * @param product product to add
+     */
+    public void addProduct(Product product){
+
+        if(products ==  null){
+            products = new ArrayList<>();
+        }
+
+        products.add(product);
+    }
+
+    /**
+     * Adds a user to the recipe
+     * used for adding favorites
+     * @param user user to add
+     */
+    public void addUser(User user){
+
+        if(users ==  null){
+            users = new ArrayList<>();
+        }
+
+        users.add(user);
+    }
 }

src/main/java/ntnu/idatt2016/v233/SmartMat/service/RecipeService.java

 package ntnu.idatt2016.v233.SmartMat.service;
 
 import ntnu.idatt2016.v233.SmartMat.entity.Recipe;
+import ntnu.idatt2016.v233.SmartMat.entity.user.User;
 import ntnu.idatt2016.v233.SmartMat.repository.RecipeRepository;
 
 import java.util.List;
@@ -89,4 +90,16 @@ public class RecipeService {
         recipeRepository.deleteById(id);
     }
 
+
+    /**
+     * Adds a user to a recipe
+     * used for adding favorite recipes
+     * @param recipe recipe to add user to
+     * @param user user to add to recipe
+     */
+    public void addUserToRecipe(Recipe recipe, User user){
+        recipe.addUser(user);
+        recipeRepository.save(recipe);
+    }
+
 }
\ No newline at end of file

src/main/java/ntnu/idatt2016/v233/SmartMat/service/user/UserService.java

 package ntnu.idatt2016.v233.SmartMat.service.user;
 
 import lombok.AllArgsConstructor;
+import ntnu.idatt2016.v233.SmartMat.entity.Recipe;
 import ntnu.idatt2016.v233.SmartMat.entity.user.User;
 import ntnu.idatt2016.v233.SmartMat.repository.user.UserRepository;
+import ntnu.idatt2016.v233.SmartMat.service.RecipeService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 
@@ -21,6 +23,8 @@ public class UserService {
 
     private UserRepository userRepository;
 
+    private RecipeService recipeService;
+
 
     /**
      * gets user from username out of database
@@ -97,4 +101,21 @@ public class UserService {
     public Optional<User> getUserFromEmail(String email) {
         return userRepository.findByEmail(email);
     }
+
+    /**
+     * adds recipe to users favorite recipes
+     * @param username username of user
+     * @param recipeId id of recipe
+     * @throws RuntimeException if user or recipe does not exist or user
+     */
+    public void addFavoriteRecipe(String username, long recipeId) throws RuntimeException{
+        User user = userRepository.findByUsername(username)
+                .orElseThrow(()-> new UsernameNotFoundException("did not find user"));
+        Recipe tempRecipe = recipeService.getRecipeById(recipeId)
+                .orElseThrow(()-> new RuntimeException("did not find recipe"));
+        user.addRecipe(tempRecipe);
+
+        recipeService.addUserToRecipe(tempRecipe, user);
+        userRepository.save(user);
+    }
 }

src/test/java/ntnu/idatt2016/v233/SmartMat/repository/RecipeRepositoryTest.java

@@ -3,12 +3,15 @@ package ntnu.idatt2016.v233.SmartMat.repository;
 import static org.junit.jupiter.api.Assertions.*;
 
 import java.util.List;
+import java.util.Optional;
 
+import ntnu.idatt2016.v233.SmartMat.entity.user.User;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 
 import ntnu.idatt2016.v233.SmartMat.entity.Recipe;
+import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
 
 @DataJpaTest
 public class RecipeRepositoryTest {
@@ -16,6 +19,9 @@ public class RecipeRepositoryTest {
     @Autowired
     private RecipeRepository recipeRepository;
 
+    @Autowired
+    private TestEntityManager entityManager;
+
     @Test
     public void testGetByName() {
         Recipe recipe = Recipe.builder()
@@ -74,4 +80,39 @@ public class RecipeRepositoryTest {
         assertEquals(recipe2.getName(), foundRecipes.get(1).getName());
     }
 
+    @Test
+    void shouldAddRecipeToFavorite(){
+        Recipe recipe = Recipe.builder()
+                .name("Pizza Margherita")
+                .description("The classic Italian pizza")
+                .build();
+        recipeRepository.save(recipe);
+        long id = recipe.getId();
+
+        User user = User.builder()
+                .username("testuser")
+                .password("password")
+                .enabled(true)
+                .email("test@test.com")
+                        .build();
+
+        entityManager.persist(user);
+
+        user.addRecipe(recipe);
+        recipe.addUser(user);
+
+        entityManager.persist(user);
+        recipeRepository.save(recipe);
+
+
+        Optional<Recipe> foundRecipe = recipeRepository.findById(id);
+
+        assertTrue(foundRecipe.isPresent());
+
+        assertTrue(foundRecipe.get().getUsers().size() > 0);
+        assertTrue(entityManager.find(User.class, user.getUsername()).getRecipes().size() > 0);
+
+
+    }
+
 }