public async Task <IActionResult> UpdateMembership(int id, AuthorMembership membership)
{
var author = await _dbContext.Authors.FindAsync(id);
EnsureAuthorExists(author);
author.UpdateMembership(membership);
await _dbContext.SaveChangesAsync();
return(NoContent());
}
public void UpdateMembership(AuthorMembership membership)
{
// add validations.
AuthorMembership = membership;
}