/// <summary>
/// Updates the existing tag.
/// </summary>
public async Task UpdateAsync(int id, TagVM vm)
{
await ValidateAsync(vm, id);
var tag = await _db.Tags.GetAsync(x => x.Id == id, $"Tag #{id} does not exist.");
_mapper.Map(vm, tag);
await _db.SaveChangesAsync();
}
/// <summary>
/// Creates a new tag.
/// </summary>
public async Task <TagVM> CreateAsync(TagVM vm)
{
await ValidateAsync(vm, null);
var tag = _mapper.Map <Tag>(vm);
_db.Tags.Add(tag);
await _db.SaveChangesAsync();
return(_mapper.Map <TagVM>(tag));
}
/// <summary>
/// Ensures that the request is correct.
/// </summary>
private async Task ValidateAsync(TagVM vm, int?id)
{
if (string.IsNullOrEmpty(vm.Caption))
{
throw new OperationException($"Required field {nameof(vm.Caption)} is not set.");
}
if (!Enum.IsDefined(typeof(TagType), vm.Type))
{
throw new OperationException($"Tag type '{vm.Type}' is unknown.");
}
if (await _db.Tags.AnyAsync(x => x.Caption.ToLower() == vm.Caption.ToLower() && x.Id != id))
{
throw new OperationException($"Tag '{vm.Caption}' already exists.");
}
}
