public async Task <IActionResult> Create([Bind("Id,CourseId,DisplayName,UrlName")] CourseUnit courseUnit)
{
if (ModelState.IsValid)
{
// url address
if (String.IsNullOrEmpty(courseUnit.UrlName))
{
// leave all
courseUnit.UrlName = courseUnit.DisplayName.ConvertToUrlName();
if (courseUnit.UrlName.Length < 4) // error if too small
{
ModelState.AddModelError("UrlName", "Choose a url name which contains only numbers, digits, hyphen and underbar, or choose a course name with more english chars.");
return(View(courseUnit));
}
}
// put the unit as last in the course
courseUnit.InCourseOrder = await _context.Units.Where(u => u.CourseId == courseUnit.CourseId).MaxAsync(u => u.InCourseOrder) + 1;
_context.Add(courseUnit);
await _context.SaveChangesAsync();
return(RedirectToAction(nameof(Index)));
}
ViewData["CourseId"] = new SelectList(_context.Courses, "Id", "DisplayName", courseUnit.CourseId);
return(View(courseUnit));
}
private async Task <CoursePage> GetPage(string course, string unit, string page)
{
if (String.IsNullOrWhiteSpace(course))
{
return(null);
}
Course c = await _context.Courses.Include(c => c.Units)
.ThenInclude(u => u.Pages)
.FirstOrDefaultAsync(c => c.UrlName == course);
if (c == null)
{
return(null);
}
c = c.SortUnitsAndPages();
// if no unit url name specified, get first page of first unit
if (String.IsNullOrWhiteSpace(unit))
{
return(c.Units.ElementAt(0).Pages.ElementAt(0));
}
CourseUnit u = c.Units.FirstOrDefault(u => u.UrlName == unit);
if (u == null)
{
return(null);
}
// if no page url name, return first page
if (String.IsNullOrWhiteSpace(page))
{
return(u.Pages.ElementAt(0));
}
return(u.Pages.FirstOrDefault(p => p.UrlName == page));
}
public async Task <IActionResult> Edit(int id, [Bind("Id,CourseId,DisplayName,InCourseOrder,UrlName")] CourseUnit courseUnit)
{
if (id != courseUnit.Id)
{
return(NotFound());
}
if (ModelState.IsValid)
{
try
{
// url address
if (String.IsNullOrEmpty(courseUnit.UrlName))
{
// leave all
courseUnit.UrlName = courseUnit.DisplayName.ConvertToUrlName();
if (courseUnit.UrlName.Length < 4) // error if too small
{
ModelState.AddModelError("UrlName", "Choose a url name which contains only numbers, digits, hyphen and underbar, or choose a course name with more english chars.");
return(View(courseUnit));
}
}
_context.Update(courseUnit);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!CourseUnitExists(courseUnit.Id))
{
return(NotFound());
}
else
{
throw;
}
}
return(RedirectToAction(nameof(Index)));
}
ViewData["CourseId"] = new SelectList(_context.Courses, "Id", "Description", courseUnit.CourseId);
return(View(courseUnit));
}
