fix changing question type

SurveyBackend/SurveyBackend.API/Controllers/QuestionController.cs

@@ -71,7 +71,8 @@ public class QuestionController : ControllerBase
         var question = QuestionMapper.QuestionUpdateToModel(dto, id);
         await _questionService.UpdateQuestionAsync(question);
         var updatedQuestion = await _questionService.GetQuestionByIdAsync(id);
-        return Ok(updatedQuestion);
+        var result = QuestionMapper.ModelToQuestionDto(updatedQuestion);
+        return Ok(result);
     }
 
     /// <summary>

SurveyBackend/SurveyBackend.API/Mappers/QuestionMapper.cs

@@ -69,16 +69,22 @@ public static class QuestionMapper
             {
                 Id = questionId,
                 Title = dto.Title,
+                Discriminator = "TextQuestion",
+                AnswerVariants = []
             },
             "singleanswerquestion" => new SingleAnswerQuestion
             {
                 Id = questionId,
                 Title = dto.Title,
+                Discriminator = "SingleAnswerQuestion",
+                AnswerVariants = []
             },
             "multipleanswerquestion" => new MultipleAnswerQuestion
             {
                 Id = questionId,
                 Title = dto.Title,
+                Discriminator = "MultipleAnswerQuestion",
+                AnswerVariants = []
             },
             _ => throw new BadRequestException("Unknown question type")
         };

SurveyBackend/SurveyBackend.Services/Services/QuestionService.cs

@@ -41,8 +41,21 @@ public class QuestionService : IQuestionService
 
         question.SurveyId = questionBase.SurveyId;
 
+        // Если изменился тип вопроса (Discriminator), используем новый тип
+        if (questionBase.Discriminator != question.Discriminator)
+        {
+            // Удаляем старый вопрос
+            await _questionRepository.DeleteAsync(questionBase.Id);
+            
+            // Добавляем новый с тем же ID
+            await _questionRepository.AddAsync(question);
+        }
+        else
+        {
+            // Если тип не меняется, просто обновляем
             await _questionRepository.UpdateAsync(question);
         }
+    }
 
     public async Task DeleteQuestionAsync(int id)
     {