asp.net mvc - Update operation Issue in NopCommerce? -

i using nopcommerce. have created new table named "productviewdetails". have tried insert/update record in table. when tried insert new record in table,new record inserted successfully. when tried update operation ,method "updatedata" executed record did not update.

code :

    public void incremementviews(int productid)     {     productviewdetails productdetails = new productviewdetails();     productdetails.id = 5;     productdetails.productid = 1;     productdetails.numberofviews = 10;       updatedata(productdetails);     }        public void updatedata(productviewdetails productdetails)     {                 _productviewdetails.update(productdetails);      }   

update method code :

   public partial class efrepository<t> : irepository<t> t : baseentity    {     private readonly idbcontext _context;     private idbset<t> _entities;      public void update(t entity)       {         try         {             if (entity == null)                 throw new argumentnullexception("entity");              this._context.savechanges();         }         catch (dbentityvalidationexception dbex)         {             var msg = string.empty;              foreach (var validationerrors in dbex.entityvalidationerrors)                 foreach (var validationerror in validationerrors.validationerrors)                     msg += environment.newline + string.format("property: {0} error: {1}", validationerror.propertyname, validationerror.errormessage);              var fail = new exception(msg, dbex);             //debug.writeline(fail.message, fail);             throw fail;         }     }    } 

what problem?

nopcommerce use entity framework lazy loading , proxied entities tracking changes, when instantiate new entity (as in new productviewdetails()) entity framework context know nothing entity , context can´t track changes.

• if entity exists repository getbyid method instead of instantiating it, context return , attached , proxied entity context tack every change , when call update changes save.
• if entity new 1 should call add method of repository.