/// <summary>
/// Get a problem by the problem's ID
/// </summary>
public TeacherProblemUpdateViewModel GetProblemById(int problemId)
{
var problem = _db.Problems.SingleOrDefault(x => x.Id == problemId);
if (problem != null)
{
var model = new TeacherProblemUpdateViewModel {
Id = problem.Id,
Name = problem.Name,
Description = problem.Description,
AttachmentName = problem.Attachment,
Filetype = problem.Filetype,
Language = problem.Language,
TestCases = new List <TeacherTestCaseViewModel>()
};
var testCases = _db.TestCases.Where(x => x.ProblemId == problemId);
foreach (var testCase in testCases)
{
model.TestCases.Add(new TeacherTestCaseViewModel {
Id = testCase.Id,
Input = testCase.Input,
Output = testCase.ExpectedOutput
});
}
return(model);
}
return(null);
}
/// <summary>
/// Get all problems in a base course via a course instance Id.
/// </summary>
public List <TeacherProblemUpdateViewModel> GetProblemsInCourseById(int courseInstanceId)
{
var problemList = new List <TeacherProblemUpdateViewModel>();
var courseId = _courseService.GetCourseIdByCourseCourseInstanceId(courseInstanceId);
if (courseId != 0)
{
var problems = _db.Problems.Where(x => x.CourseId == courseId);
foreach (var problem in problems)
{
var p = new TeacherProblemUpdateViewModel {
Id = problem.Id,
Description = problem.Description,
Name = problem.Name,
AttachmentName = problem.Attachment,
CourseId = problem.CourseId,
Filetype = problem.Filetype,
Language = problem.Language,
TestCases = new List <TeacherTestCaseViewModel>()
};
foreach (var testCase in problem.TestCases)
{
var t = new TeacherTestCaseViewModel {
Input = testCase.Input,
Output = testCase.ExpectedOutput
};
p.TestCases.Add(t);
}
problemList.Add(p);
}
}
return(problemList);
}
/// <summary>
/// Edit problem's information and test cases
/// </summary>
public ActionResult EditProblemInformation(TeacherProblemUpdateViewModel problem)
{
return(Json(_teacherService.UpdateProblem(problem)));
}
/// <summary>
/// Update problem information via TeacherProblemUpdateViewModel
/// </summary>
public bool UpdateProblem(TeacherProblemUpdateViewModel problem)
{
var dbProblem = _db.Problems.SingleOrDefault(x => x.Id == problem.Id);
if (dbProblem != null)
{
dbProblem.Description = problem.Description;
dbProblem.Name = problem.Name;
// Filetype check
if (_db.Filetypes.SingleOrDefault(x => x.Type == problem.Filetype) == null)
{
var fileType = new Filetype {
Type = problem.Filetype
};
_db.Filetypes.Add(fileType);
}
dbProblem.Filetype = problem.Filetype;
// Language check
if (_db.ProgrammingLanguages.SingleOrDefault(x => x.Language == problem.Language) == null)
{
var language = new ProgrammingLanguage {
Language = problem.Filetype
};
_db.ProgrammingLanguages.Add(language);
}
dbProblem.Language = problem.Language;
var dbTestCases = _db.TestCases.Where(x => x.ProblemId == problem.Id);
// Delete removed test cases
foreach (var dbTestCase in dbTestCases)
{
var found = problem.TestCases.Any(x => x.Id == dbTestCase.Id);
if (!found)
{
_db.TestCases.Remove(dbTestCase);
}
}
// Add new test cases
foreach (var testCase in problem.TestCases.Where(x => x.Id == 0))
{
_db.TestCases.Add(new TestCase {
ExpectedOutput = testCase.Output,
Input = testCase.Input,
ProblemId = problem.Id
});
}
try {
_db.SaveChanges();
return(true);
}
catch (Exception e) {
return(false);
}
}
return(false);
}