Api endpoint that edits one element in list

I am currently building a rest api that lets the user enter a recipe and describe it. I am using spring-boot as backend and angularjs as frontend.

This is springboot recipe file

package com.example.springboot;
import com.example.springboot.Recipe;
import javax.persistence.*;
import javax.validation.constraints.NotBlank;
import  javax.validation.constraints.NotNull;

@Entity // This tells Hibernate to make a table out of this class

public class Recipe {

	public Recipe(){

	}

	public Recipe(Integer id, String name, String description, String type, Integer preptime, Integer cooktime, String content, Integer difficulty){
		this.id = id;
		this.name = name;
		this.description = description;
		this.type = type;
		this.preptime = preptimee;
		this.cooktime = cooktime;
		this.content = content;
		this.difficulty = difficulty;
	}

	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	private Integer id;


	private String name;


	private String description;

	
	private String type;

	
	private Integer preptime;

	
	
	
	@Column(columnDefinition = "TEXT")
	private String content;

	private Integer difficulty;






	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public Integer getDifficulty() {
		return difficulty;
	}

	public void setDifficulty(Integer difficulty) {
		this.difficulty = difficulty;
	}

	

	public Integer getpreptime {
		return preptime;
	}

	public void setpreptime(Integer preptime) {
		this.preptime = preptime;
	}
}

I created an Endpoint where the user can edit the whole recipe. The user can edit the name , description, content and so on in the recipes/edit/{id} endpoint.
The Endpoint looks like this.

@PutMapping("/recipes/edit/{id}")
    void updateRecipe(@PathVariable int id, @RequestBody Recipe recipe ) {
        System.out.println("entering");
        Recipe recipe_ = recipeRepository.findById(id).get();
        recipe_.setName(recipe.getName());
        recipe_.setDescription(recipe.getDescription());
        recipe_.setType(recipe.getType());
        recipe_.setpreptime(recipe.getpreptime());
        recipe_.setContent(recipe.getContent());

        
        System.out.println("entering " + recipe.getTitle());
        System.out.println("entering" + recipe.getType());
        System.out.println("entering" + recipe.getDescription());


        System.out.println("adding");
        recipeRepository.save(recipe_);
    }

Now I just want to create an Endpoint which only serves the purpose for renaming the name of the recipe. This putmapping should accept a list as its input then only rename the name of the recipe.

   @PutMapping("/recipes/rename")
      public List<Recipe> {
       System.out.println("entering renaming");
     //  recipe_.setName(recipe.getName()); ?


}

I don't know how I can implement this. This is what I have come up with so far. An endpoint which takes a list as a parameter.

This is the service.ts file that updates the Recipes in the edit function
service.ts:

updateRecipe (id: number, recipe: any): Observable<any > {
    const url = `${this.usersUrl}/edit/${id}`;
  return this.http.put(url ,recipe);
}

where the updateRecipe gets called:

 save(): void {
    const id = +this.route.snapshot.paramMap.get('name');
     this.recipeService.updateRecipe2(id, this.recipes)
       .subscribe(() => this.gotoUserList());
       
   }

This implementation work , I don't know how I can get it work or how I can rewrite the functions so that it can update only the name of the recipe and not the whole file.

Could someone help me?

Your update the name method should look like that:

@PutMapping("...{id}")
public void updateName(@PathVariable Integer id, @RequestParam String name){
    Recipe recipe = repository.findById(id).orElseThrow(...);
    recipe.setName(name);
}

if you want to rename list of recipes

public void renameRecipes(String oldName, String newName){
    repository.findByName(oldName)
              .forEach(r -> r.setName(newName));
}

@PutMapping("recipes/rename")
public void updateNames(@PequestParam String oldName, @RequestParam String newName){
    renameRecipes(oldName, newName);
}

Try that.