GerbilManager/GerbilManagerWebAPI/Repositories/InMemGerbilRepository.cs

using GerbilManagerWebAPI.Models;

namespace GerbilManagerWebAPI.Repositories
{
    public class InMemGerbilRepository : IGerbilRepository
    {
        private readonly List<Gerbil> _gerbilList = new()
        {
            new Gerbil() {Id = Guid.NewGuid(), Name = "Blacky", Breeder = null, Litter = null, Gender = Gender.unknown},
            new Gerbil() {Id = Guid.NewGuid(), Name = "Coocky", Breeder = null, Litter = null, Gender = Gender.male},
            new Gerbil() {Id = Guid.NewGuid(), Name = "Lazy", Breeder = null, Litter = null, Gender = Gender.female}
        };

        public IEnumerable<Gerbil> GetGerbils()
        {
            return _gerbilList;
        }

        public Gerbil GetGerbil(Guid id) => _gerbilList.SingleOrDefault(x => x.Id == id);

        public void CreateGerbil(Gerbil gerbil)
        {
            _gerbilList.Add(gerbil);
        }

        public void UpdateGerbil(Gerbil gerbil)
        {
            var index = this._gerbilList.FindIndex(existingGerbil => existingGerbil.Id == gerbil.Id);
            _gerbilList[index] = gerbil;
        }

        public void DeleteGerbil(Gerbil gerbil)
        {
            var index = this._gerbilList.FindIndex(existingGerbil => existingGerbil.Id == gerbil.Id);
            _gerbilList.RemoveAt(index);
        }
    }

}