ASP.Net core correct way of implementing http methods for related models - asp.net-core

Question

I have tow models Context and Connection as following:
public class Context
{
[Key]
public long ContextId { get; set; }
[Required]
public string Role { get; set; }
public ICollection<Connection> Connections { get; set; }
public Context()
{
}
}
And
public class Connection
{
[Key]
public long ConnectionId { get; set; }
[Required]
public string Name { get; set; }
public long ContextId { get; set; }
public Context Context { get; set; }
public Connection()
{
}
}
So far, I did not create any controller or repository for Connection. ContextRepositiry looks like following:
public class ContextRepository: IContextRepository
{
private readonly WebAPIDataContext _db;
public ContextRepository(WebAPIDataContext db)
{
_db = db;
}
public Context CreateContext(Context context)
{
_db.Contexts.Add(context);
_db.SaveChanges();
return context;
}
public void DeleteContext(long id)
{
Context context = GetContext(id);
if (context != null)
{
_db.Contexts.Remove(context);
_db.SaveChanges();
}
}
public List<Context> GetAllContexts()
{
return _db.Contexts.AsNoTracking().ToList();
}
public Context GetContext(long id)
{
return _db.Contexts.FirstOrDefault(o => o.ContextId == id);
}
public void UpdateContext(long id, Context context)
{
}
}
public interface IContextRepository
{
List<Context> GetAllContexts();
Context GetContext(long id);
Context CreateContext(Context context);
void UpdateContext(long id, Context context);
void DeleteContext(long id);
}
And it's controller:
[Route("api/[controller]")]
public class ContextController : Controller
{
private readonly IContextRepository _contexts;
public ContextController(IContextRepository contexts)
{
_contexts = contexts;
}
[HttpGet("")]
public IActionResult GetAllContexts()
{
try
{
List<Context> contexts = _contexts.GetAllContexts();
return Ok(contexts);
}
catch (EntityNotFoundException<Context>)
{
return NotFound();
}
}
[HttpGet("{id}")]
public IActionResult GetContext(long id)
{
Context context= _contexts.GetContext(id);
if (context == null)
{
return NotFound();
}
return Ok(context);
}
[HttpPost]
public IActionResult CreateContext([FromBody] Context context)
{
if (ModelState.IsValid == false)
{
return BadRequest(ModelState);
}
Context createdContext= _contexts.CreateContext(context);
if (createdContext== null)
{
return NotFound();
}
return CreatedAtAction(
nameof(GetContext), new { id = createdContext.ContextId}, createdContext);
}
[HttpPut("{id}")]
public IActionResult UpdateContext(long id, [FromBody] Context context)
{
if (ModelState.IsValid == false)
{
return BadRequest(ModelState);
}
try
{
_contexts.UpdateContext(id, context);
return Ok();
}
catch (EntityNotFoundException<Context>)
{
return NotFound();
}
}
[HttpDelete("{id}")]
public IActionResult DeleteCOntext(long id)
{
_contexts.DeleteContext(id);
return Ok();
}
}
Question: While creating a context I shouldn't have to enter any connection data i.e. it should be optional (look ta the swagger request bellow). However, on updating a specific context there could be connection data, and corresponding context should be updated accordingly.
Right now, in Swagger for POST if I enter something like:
{
"contextId": 0,
"role": "Employee",
"connections": [
{
"connectionId": 0,
"name": "",
"contextId": 0,
"context": {}
}
]
}
then it says, The Name field is required and The Role field is required (I am trying to send just context data like role and leaving blank connection data- which should be possible). If I remove "connections":[] then it posts with connections set to null, but don't want to remove it from there.