Spring - API Rest simple

package com.citaClientes;

import com.github.javafaker.Faker;
import com.citaClientes.models.Pie;
import com.citaClientes.repositories.PieRepository;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;



@SpringBootApplication
public class SpringBootRestExampleApplication {

    private final Faker faker = new Faker();

	public static void main(String[] args) {
		SpringApplication.run(SpringBootRestExampleApplication.class, args);
	}

    @Bean
    public CommandLineRunner initializeDb(PieRepository repository){
        return (args) -> {
            repository.deleteAll();
            //Insert some random pies
            for(int i = 0; i < 20; i++) {
                repository.save(new Pie(faker.lorem().word(), faker.lorem().sentence()));
            }
        };
    }

}

package com.citaClientes.controllers;

import com.citaClientes.models.Pie;
import com.citaClientes.repositories.PieRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.Collection;

@RestController
@RequestMapping("/pies")
public class PieRestController {

    @Autowired
    private PieRepository repository;

    //Devuelve todos los elementos

    @RequestMapping(method = RequestMethod.GET)
    public ResponseEntity<Collection<Pie>> getAllPies() {
        return new ResponseEntity<>((Collection<Pie>) repository.findAll(), HttpStatus.OK);
    }

    //Devuelve un element por ID

    @RequestMapping(method = RequestMethod.GET, value = "/{id}")
    public ResponseEntity<Pie> getPieWithId(@PathVariable Long id) {
        return new ResponseEntity<>(repository.findOne(id), HttpStatus.OK);
    }

    //Busca un elemento por el nombre, y lo devuelve

    @RequestMapping(method = RequestMethod.GET, params = {"name"})
    public ResponseEntity<Collection<Pie>> findPieWithName(@RequestParam(value = "name") String name) {
        return new ResponseEntity<>(repository.findByName(name), HttpStatus.OK);
    }

    //Crea un elemento con los datos dados

    @RequestMapping(method = RequestMethod.POST)
    public ResponseEntity<?> addPie(@RequestBody Pie input) {
        return new ResponseEntity<>(repository.save(input), HttpStatus.CREATED);
    }

    //Actualiza los datos de un elmento

    @RequestMapping(method = RequestMethod.PUT, value = "/{id}")
    public ResponseEntity<?> updatePie(@PathVariable Long id, @RequestBody Pie pie) {
        if (repository.findOne(id) != null) {
            //TO-DO
            return new ResponseEntity<>(HttpStatus.OK);
        } else {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
    }

    //Elimina un elmento

    @RequestMapping(method = RequestMethod.DELETE, value = "/{id}")
    public ResponseEntity<?> deletePie(@PathVariable Long id) {
        if (repository.findOne(id) != null) {
            repository.delete(id);
            return new ResponseEntity<>(HttpStatus.OK);
        } else {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
    }

    //Elimina todos los elementos

    @RequestMapping(method = RequestMethod.DELETE)
    public ResponseEntity<?> deleteAllPie() {
        repository.deleteAll();
        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
    }

}

package com.citaClientes.models;


import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Pie implements Serializable {

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

    private String name;
    private String description;

    public Pie(String name, String description) {
        this.name = name;
        this.description = description;
    }

    //for JPA
    public Pie() {}

    public String getName() {
        return name;
    }

    public String getDescription() {
        return description;
    }

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

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

package com.citaClientes.repositories;

import com.citaClientes.models.Pie;
import org.springframework.data.repository.CrudRepository;

import java.util.List;

public interface PieRepository extends CrudRepository<Pie, Long> {
    List<Pie> findByName(String name);

    public void findByName(Pie pie);
}