GerbilManager/Controllers/GerbilsController.cs

using GerbilManager.Models;
using GerbilManager.Repositories;
using Microsoft.AspNetCore.Mvc;

namespace GerbilManager.Controllers
{
    [ApiController]
    [Route("gerbils")]
    public class GerbilsController : ControllerBase
    {
        private readonly IGerbilRepository repository;

        public GerbilsController(IGerbilRepository repo)
        {
            this.repository = repo;
        }

        //GET /gerbils
        [HttpGet]
        public IEnumerable<Gerbil> GetGerbils()
        {
            var items = repository.GetGerbils();
            return items;
        }

        //GET /gerbils
        [HttpGet("{id}")]
        public ActionResult<Gerbil> GetGerbil(Guid id)
        {
            var item = repository.GetGerbil(id);

            if(item is null)
            {
                return NotFound();
            }
            return item;
        }
    }
}