/// <summary>
/// This will return Product Children.
/// </summary>
/// <param name="parms"></param>
/// <returns></returns>
private async Task <List <ICommonWithId> > indexProductChild_DataListAsync(ControllerIndexParams parms)
{
//Get the product
parms.ProductId.IsNullOrWhiteSpaceThrowException();
Product product = await ProductBiz.FindAsync(parms.ProductId);
//parent product cannot be null. It is some kind of programming error if it is.
product.IsNullThrowException(string.Format("Product not found. Id ='{0}'", parms.ProductId));
//update the number of visits
if (!UserId.IsNullOrWhiteSpace())
{
product.NoOfVisits.AddOne(UserId, UserName);
await ProductBiz.UpdateAndSaveAsync(product);
}
//get all its child products and display them
List <ProductChild> children;
//see if the product is a shop
if (product.OwnerId.IsNullOrWhiteSpace())
{
//this is not a shop.
children = productChildren(product);
}
else
{
//this is a shop
children = shopChildren(product);
}
if (children.IsNullOrEmpty())
{
return(null);
}
List <ICommonWithId> childrenAsIcommonLst = children.Cast <ICommonWithId>().ToList();
return(childrenAsIcommonLst);
}