public async Task <IActionResult> Add(AddDestinationViewModel model)
{
if (!string.IsNullOrWhiteSpace(model.Name) && await destinationService.ExistsAsync(model.Name))
{
ModelState.AddModelError(nameof(model.Name),
"Destination with the same name already exists.");
}
var invalidIds = await tagService.CheckForInvalidTagIds(model.SelectedTags);
if (invalidIds.Any())
{
ModelState.AddModelError(nameof(model.SelectedTags),
$"Non-existing tags were selected. (Count: {invalidIds.Count})");
}
if (!await regionService.ExistsAsync(model.RegionId))
{
ModelState.AddModelError(nameof(model.RegionId), "Selected region does not exist.");
}
if (!ModelState.IsValid)
{
model.Tags = await GetTags();
model.Regions = await GetRegions();
return(View(model));
}
await destinationService.AddAsync(model.Name, model.RegionId, model.SelectedTags);
return(RedirectToAction(nameof(Add)));
}
public async Task <int> AddAsync(string name, int regionId, IList <int> tags)
{
var invalidTags = await tagService.CheckForInvalidTagIds(tags);
if (await ExistsAsync(name) ||
!await regionService.ExistsAsync(regionId) ||
invalidTags.Any())
{
return(0);
}
var destination = new Destination
{
Name = name,
RegionId = regionId
};
await database.Destinations.AddAsync(destination);
await database.SaveChangesAsync();
if (tags != null && tags.Any())
{
foreach (var tagId in tags.Distinct())
{
if (!await database.DestinationTags.AnyAsync(d => d.DestinationId == destination.Id && d.TagId == tagId))
{
await database.DestinationTags.AddAsync(new DestinationTag
{
DestinationId = destination.Id,
TagId = tagId
});
}
}
}
await database.SaveChangesAsync();
return(destination.Id);
}