public async Task <IActionResult> Edit(Page page) // Model binding
{
if (ModelState.IsValid)
{
// Never bother Homepage
page.Slug = page.Id == 1 ? "home" : page.Title.ToLower().Replace(' ', '-');
// Cannot change it to the same as other existed page
var slug = await _context.Pages.Where(p => p.Id != page.Id).FirstOrDefaultAsync(p => p.Slug == page.Slug);
if (slug != null)
{
ModelState.AddModelError("", "The page already exists");
return(View(page)); // re-fill the correct information
}
_context.Update(page);
await _context.SaveChangesAsync();
TempData["Success"] = "The page has been updated!";
return(RedirectToAction("Edit", new { id = page.Id }));
}
return(View(page)); // re-fill the correct information
}
public async Task <IActionResult> Edit(int id, Category category)
{
if (ModelState.IsValid)
{
category.Slug = category.Name.ToLower().Replace(" ", "-");
var cat = await _context.Categories.Where(c => c.Id != id).FirstOrDefaultAsync(c => c.Slug == category.Slug);
if (cat != null)
{
ModelState.AddModelError("", "The category already exists!");
return(View(category));
}
_context.Update(category);
await _context.SaveChangesAsync();
TempData["Success"] = "The category has been edited.";
//Actually here we only need id, but for generalization we use routeValues object
return(RedirectToAction("Edit", new { id })); // GET /admin/categories/edit/id
}
return(View(category));
}