public void CalculateAverageRating(BookSellerContext context)
{
var book = context.Book.Find(this.BookId);
book.AverageRating = Math.Round(Convert.ToDecimal(context.Review.Where(item => item.BookId == this.BookId).Average(item => item.Rating)), 1);
context.SaveChanges();
}
public override bool Validate(out string error, BookSellerContext context)
{
if (Author is Author author)
{
this.AuthorId = author.Id;
this.Author = null;
}
if (!context.Author.Exists(this.AuthorId))
{
error = $"{nameof(AuthorId)} - `{this.AuthorId}` does not exist in the database.";
return(false);
}
return(base.Validate(out error, context));
}
public override void IncludeChildren(BookSellerContext context) => context.Book.Include(book => book.Author).FirstOrDefaultAsync(book => book.Id == this.Id);
public override void IncludeChildren(BookSellerContext context)
{
context.Review.Include(review => review.Book).FirstOrDefaultAsync(review => review.Id == this.Id);
context.Book.Include(book => book.Author).FirstOrDefaultAsync(book => book.Id == this.BookId);
}
public virtual void IncludeChildren(BookSellerContext context)
{
}
public virtual bool Validate(out string error, BookSellerContext context)
{
error = null;
return(true);
}