ASP.NET core POST request fail - asp.net-core

Question

I have a model:
public class CoreGoal
{
[Key]
public long CoreGoalId { get; set; }
public string Title { get; set; }
public string Effect { get; set; }
public string Target_Audience { get; set; }
public string Infrastructure { get; set; }
public virtual ICollection<Benefit> Benefits { get; set; }
public virtual ICollection<Step> Steps { get; set; }
public virtual ICollection<Image> Images { get; set; }
public virtual ICollection<SubGoal> SubGoals { get; set; }
public CoreGoal()
{
}
}
And Image model is as following:
public class Image
{
[Key]
public long ImagelId { get; set; }
public byte[] Base64 { get; set; }
[ForeignKey("CoreGoalId")]
public long CoreGoalId { get; set; }
public Image()
{
}
}
My controller class:
[Route("api/[controller]")]
public class CoreGoalController : Controller
{
private readonly ICoreGoalRepository _coreGoalRepository;
//Controller
public CoreGoalController(ICoreGoalRepository coreGoalRepository) {
_coreGoalRepository = coreGoalRepository;
}
//Get methods
[HttpGet]
public IEnumerable<CoreGoal> GetAll()
{
return _coreGoalRepository.GetAllCoreGoals();
}
[HttpGet("{id}", Name = "GetCoreGoal")]
public IActionResult GetById(long id)
{
var item = _coreGoalRepository.Find(id);
if (item == null)
{
return NotFound();
}
return new ObjectResult(item);
}
//Create
[HttpPost]
public IActionResult Create([FromBody] CoreGoal item)
{
if (item == null)
{
return BadRequest();
}
_coreGoalRepository.CreateCoreGoal(item);
return CreatedAtRoute("GetCoreGoal", new { id = item.CoreGoalId }, item);
}
}
Repository:
public class CoreGoalRepository : ICoreGoalRepository
{
private readonly WebAPIDataContext _db;
public CoreGoalRepository(WebAPIDataContext db)
{
_db = db;
}
//Add new
public void CreateCoreGoal(CoreGoal coreGoal)
{
_db.CoreGoals.Add(coreGoal);
_db.SaveChanges();
}
//Get all
public IEnumerable<CoreGoal> GetAllCoreGoals()
{
return _db.CoreGoals
.Include(coreGoal => coreGoal.Benefits)
.Include(coreGoal => coreGoal.Steps)
.Include(coreGoal => coreGoal.Images)
.Include(coreGoal => coreGoal.SubGoals)
.ToList();
}
//Find specific
public CoreGoal Find(long key)
{
return _db.CoreGoals.FirstOrDefault(t => t.CoreGoalId == key);
}
}
public interface ICoreGoalRepository
{
void CreateCoreGoal(CoreGoal coreGoal);
IEnumerable<CoreGoal> GetAllCoreGoals();
CoreGoal Find(long key);
void DeleteCoreGoal(long id);
void UpdateCoreGoal(CoreGoal coreGoal);
}
When I do a POST request from swagger I get a template like:
{
"coreGoalId": 0,
"title": "string",
"effect": "string",
"target_Audience": "string",
"infrastructure": "string",
"benefits": [
{
"benefitId": 0,
"what": "string",
"coreGoalId": 0
}
],
"steps": [
{
"stepId": 0,
"what": "string",
"coreGoalId": 0
}
],
"images": [
{
"imagelId": 0,
"base64": "string",
"coreGoalId": 0
}
],
"subGoals": [
{
"subGoalId": 0,
"title": "string",
"priority": "string",
"audience": "string",
"social_aspects": "string",
"coreGoalId": 0,
"issues": [
{
"issueId": 0,
"title": "string",
"subGoalID": 0
}
]
}
]
}
If I POST like like this, my request fails with status 400, however if I remove
"images": [
{
"imagelId": 0,
"base64": "string",
"coreGoalId": 0
}
],
from this request, then it is successful. Why is it happening? All other models i.e. Benefit, Step are exactly identical to Image in structure.
UPDATE:
Changing base64 type from byte[] to string eliminates this problem but in that case while saving to my MySql database the big base64 string is chopped and kind of becomes useless to again form the image.