I have the following entities:
namespace SomeDataAccess
{
public partial class Patch
{
public int PatchID { get; set; }
public double Number { get; set; }
}
public partial class PatchFile
{
public int FileID { get; set; }
public int PatchID{ get; set; }
public string Name { get; set; }
public string Type { get; set; }
}
}
And I have the following api model:
namespace Web_API.Models
{
[Table("SomeFiles")]
public class SomeFilesViewModel
{
[Key]
public int FileId { get; set; }
public int PatchNumber{ get; set; }
public string Name { get; set; }
public string Type { get; set; }
}
}
The GET method is implemented successfully as following:
/ GET: api/SomeFiles/5
[ResponseType(typeof(SomeFileViewModel))]
public async Task<IHttpActionResult> GetSomeFileViewModel(int id)
{
var patchFile = await _context.PatchFile.FindAsync(id);
return someFile == null
? (IHttpActionResult)NotFound()
: Ok(new someFileViewModel
{
FileId = patchFile.FileID,
PatchNumber = patch.Number,
Name = patchFile.Name,
Type = patchFile.Type,
});
}
Thus far, I have implemented the PUT method as following:
// PUT: api/SomeFiles
[ResponseType(typeof(void))]
public async Task<IHttpActionResult> PutSomeFileViewModel(SomeFilesViewModel someFileViewModel)
{
if (!ModelState.IsValid)
return BadRequest(ModelState);
var file = new SomeDataAccess.PatchFile
{
FileID = someFileViewModel.FileId,
PatchID = _context.Patch.FirstOrDefault(i => i.Number == someFileViewModel.PatchNumber).PatchID
// How to get the relavent patch id by having the patch Number?
Name = someFileViewModel.Name,
Type = someFileViewModel.Type
};
_context.Entry(file).State = EntityState.Modified;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!FileExists(file.FileID))
return NotFound();
throw;
}
return StatusCode(HttpStatusCode.NoContent);
}
And a sample payload:
Sample PayLoad:
{
"FileId" = 4
"PatchNumber" = 894
"Name" = "MyFile.exe"
Type = "Application"
}
How can I update or add a record to PatchFile entity if I only have the PatchNumber and not the PatchId to prevent conflicted with the FOREIGN KEY constraint?
_context.Patch.FirstOrDefault(i => i.Number == someFileViewModel.PatchNumber).PatchID
Is above the correct approach? If yes, Is this not making another trip to database? Is there a better approach?
You could add the PatchID to the SomeFilesViewModel
along the PatchNumber. Otherwise there will be this extra query to the DB. On the other hand: this might create another possible problem, as the sent data don't have to be accurate and you'll need to check/validate it and that would be another trip to DB.
If you decide to stick with the extra query I would suggest rewriting it as following:
_context.Patch.Where(i => i.Number == someFileViewModel.PatchNumber).Select(i => i.PatchID).FirstOrDefault();
That way you get only the ID from the DB; assuming you don't need to work with other parts of your Patch
object.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.