public async Task <DbGrammarExercise> EditGrammarExerciseAsync(DbGrammarExercise grammarExercise)
{
var oldExercise = await _context.GrammarExercises
.Where(e => e.Id == grammarExercise.Id)
.SingleOrDefaultAsync();
if (oldExercise == null)
{
return(null);
}
if (oldExercise.Question != grammarExercise.Question)
{
oldExercise.Question = grammarExercise.Question;
}
if (oldExercise.CorrectAnswer != grammarExercise.CorrectAnswer)
{
oldExercise.CorrectAnswer = grammarExercise.CorrectAnswer;
}
if (oldExercise.RuleId != grammarExercise.RuleId)
{
oldExercise.RuleId = grammarExercise.RuleId;
}
if (oldExercise.WrongAnswer1 != grammarExercise.WrongAnswer1)
{
oldExercise.WrongAnswer1 = grammarExercise.WrongAnswer1;
}
if (oldExercise.WrongAnswer2 != grammarExercise.WrongAnswer2)
{
oldExercise.WrongAnswer2 = grammarExercise.WrongAnswer2;
}
if (oldExercise.WrongAnswer3 != grammarExercise.WrongAnswer3)
{
oldExercise.WrongAnswer3 = grammarExercise.WrongAnswer3;
}
try
{
_context.GrammarExercises.Update(oldExercise);
await _context.SaveChangesAsync();
}
catch (Exception)
{
return(null);
}
return(grammarExercise);
}
public async Task <DbGrammarExercise> CreateGrammarExerciseAsync(DbGrammarExercise grammarExercise)
{
if (grammarExercise == null || grammarExercise.Id != 0)
{
return(null);
}
var test = await _context.Tests
.Where(t => t.Id == grammarExercise.TestId)
.SingleOrDefaultAsync();
test.NumberOfQuestions++;
_context.GrammarExercises.Add(grammarExercise);
await _context.SaveChangesAsync();
return(grammarExercise);
}
