For example I have two entities
Class A
{
public Guid Id {get;set;}
public Guid BId {get;set;}
public B InstanceB {get;set;}
}
Class B
{
public Guid Id {get;set}
}
B is related to A, on my silver light application I am creating a new instance of A, and also a new instance of B. The new instance of B does not exist yet. But I need the instance of B on my service.
Can I do this without Entity or Association with Ria Service?
Edit:
My Class A :
public partial class lSync{
// Metadata classes are not meant to be instantiated.
private lSync() {
}
public string ConflictMessage { get; set; }
public DateTime DateInserted { get; set; }
public Guid vValuesId { get; set; }
public Guid ID { get; set; }
public bool IsConflict { get; set; }
public bool IsReadyToSync { get; set; }
public Guid SyncSet { get; set; }
public vValues vValues { get; set; }
}
My Ria Service:
[Invoke]
public lSync[] SynchvValuesFromClient(lSync[] syncs) {
bool noConflict = true;
foreach (lSync sync in syncs) {
var servervValue = GetvValuesByID(sync.vValuesId).FirstOrDefault();
var queuevValues = sync.vValues; //sync.vValues here is null, but my sync.vValuesId is not
if (servervValue== null) {
InsertvValues(queueValue);
}
else {
if (servervValue.IsServerConflict(queueValue)) {
sync.IsConflict = true;
sync.ConflictMessage = "Conflict";
noConflict = false;
break;
}
if (!servervValue.AreValuesEqual(queueValue)) {
UpdatevValues(queueValue);
}
}
}
if (noConflict) {
this.ObjectContext.SaveChanges();
}
return syncs;
}
public IQueryable<vValues> GetvValuesByID(Guid ID) {
return ObjectContext.vValues.Where(t => t.ID == ID);
}
public void InsertvValues(vValues model) {
model.ServerDate = DateTime.UtcNow;
if ((model.EntityState != EntityState.Detached)) {
this.ObjectContext.ObjectStateManager.ChangeObjectState(model, EntityState.Added);
}
else {
this.ObjectContext.vValues.AddObject(model);
}
}
public void UpdatevValues(vValuesmodel) {
model.ServerDate = DateTime.UtcNow;
this.ObjectContext.vValues.AttachAsModified(model, this.ChangeSet.GetOriginal(model));
}
:(
Edit
The order is wrong of your method :)
Make an instance of the service before creating instances of the Entities.
It should be:
public void SyncToServer() {
ContextService service = new ContextService();
var instanceA = new A();
instanceA.InstanceB = new B();
service.SubmitChanges(); //service.SaveChanges() for LinqToEntities
}
Are you reloading after a submit because only adding the [Include] attribute in the DomainService MetaData won't work. You need to do this in the DomainService for LinqToSql
public A GetA()
{
DataLoadOptions dlo = new DataLoadOptions();
dlo.LoadWith<A>(a => a.InstanceB);
this.DataContext.LoadOptions = dlo;
return this.DataContext.APlural.FirstOrDefault( ); //don't know the plural of A.
}
LinqToEntities:
public A GetA()
{
return this.MyEntitiesContext.APlural.Include( "instanceB" ).FirstOrDefault( ); //don't know the plural of A.
}
var a = new A(){
B = new B(); //or (B)selectedItem
}
now a.Id and a.BId is 0 until you SaveChanged and return saved A
Related
I have a view Model:
public class CountViewModel
{
public int NewsLetterEmailCount { get; set; }
public int CurrentMonthNewsLetter { get; set; }
public int NewsLetterPercentage { get; set; }
}
then I create the second ViewModel that want to list of title:
public class AdminDashboardUnreadMessage
{
[Display(Name = "عنوان")]
public string Title { get; set; }
//public List<AdminDashboardUnreadMessage>
AdminDashboardUnreadMessages { get; set; }
}
I have a ticket Table, these are my 2 services:
public async Task<CountViewModel> AdminContentCount()
{
CountViewModel adminContetnCount = new CountViewModel()
{
UserCount = await _userRepository.UserCount(),
CurrentMonthUser = await _userRepository.CurrentMonthUser(),
NewsLetterEmailCount = await _newsLetterRepository.NewsLetterEmailCount(),
CurrentMonthNewsLetter = await _newsLetterRepository.CurrentMonthNewsLetterEmail(),
return adminContetnCount;
}
public async Task<List<AdminDashboardUnreadMessage>> ShowUnReadTicketMessages()
{
return await _userRepository.ShowUnReadTicketMessages();
}
How can I use 2 services on my service
I mean I don't want to use from View Data
I think you need to define a new ViewModel like this :
public class NewViewModel
{
public CountViewModel CountModel { get; set; }
public AdminDashboardUnreadMessage AdminDashboardModel { get; set; }
}
And now you need to return this object as a result of a newly created service which responsible to aggregate the result of two different services.
public async Task<NewViewModel> NewService()
{
var adminContetnCount = await AdminContentCount();
var dashboard = await ShowUnReadTicketMessages();
return new NewViewModel
{
CountModel = adminContetnCount,
AdminDashboardModel= dashboard
};
}
May be this could be accomplished using a trigger and an audit log table in SQL server. Or perhaps it could be accomplished by overriding the SaveChanges() method in Entity Framework. My concern is how to write the code to get it done and which one will be efficient. Can anybody help me?
If you log changes through the code, alongside data, you can add additional information to the audit log such as IP, user info, client info, ... and it is really helpful. The downside would be if someone changes data directly via the database you cannot find out what data has changed and the performance of logging data change by audit log table is better. If you just need to capture data change and don't need to find out who and from where data has changed choose the database approach.
Here is an implementation to capture data changes by EF Core:
public interface IAuditableEntity
{
}
public class AuditLogEntity
{
public int Id { get; set; }
public string UserName { get; set; }
public DateTime CreateDate { get; set; }
public ChangeType ChangeType { get; set; }
public string EntityId { get; set; }
public string EntityName { get; set; }
public IEnumerable<EntityPropertyChange> Changes { get; set; }
}
public class EntityPropertyChange
{
public string PropertyName { get; set; }
public string OldValue { get; set; }
public string NewValue { get; set; }
}
public enum ChangeType
{
Add = 1,
Edit = 2,
Remove = 3
}
In DbContext:
public class RegistryDbContext : DbContext
{
private readonly IHttpContextAccessor _contextAccessor;
public RegistryDbContext(DbContextOptions<RegistryDbContext> options, IHttpContextAccessor contextAccessor) :
base(options)
{
_contextAccessor = contextAccessor;
}
public DbSet<AuditLogEntity> AuditLogs { get; set; }
public override int SaveChanges()
{
CaptureChanges();
return base.SaveChanges();
}
public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken = new CancellationToken())
{
CaptureChanges();
return await base.SaveChangesAsync(cancellationToken);
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<AuditLogEntity>().Property(p => p.UserId).IsUnicode(false).HasMaxLength(36).IsRequired(false);
modelBuilder.Entity<AuditLogEntity>().Property(p => p.EntityId).IsUnicode(false).HasMaxLength(36).IsRequired();
modelBuilder.Entity<AuditLogEntity>().Property(p => p.EntityName).IsUnicode(false).HasMaxLength(256).IsRequired(false);
builder.Ignore(p => p.Changes);
modelBuilder.Entity<AuditLogEntity>()
.Property(p => p.Changes).IsUnicode().HasMaxLength(int.MaxValue).IsRequired(false)
.HasConversion(
changes => JsonConvert.SerializeObject(changes, Formatting.None, new JsonSerializerSettings
{
NullValueHandling = NullValueHandling.Include,
TypeNameHandling = TypeNameHandling.Auto
}),
changes => JsonConvert.DeserializeObject<IList<EntityPropertyChange>>(changes, new JsonSerializerSettings
{
NullValueHandling = NullValueHandling.Include,
TypeNameHandling = TypeNameHandling.Auto
}));
}
private void CaptureChanges()
{
var changes = ChangeTracker
.Entries<IAuditableEntity>()
.Where(e =>
e.State == EntityState.Added ||
e.State == EntityState.Modified ||
e.State == EntityState.Deleted)
.Select(GetAuditLogItems)
.ToList();
AuditLogs.AddRange(changes);
}
private AuditLogEntity GetAuditLogItems(EntityEntry entry)
{
var auditEntity = new AuditLogEntity
{
CreateDate = DateTime.Now,
EntityId = entry.Properties.FirstOrDefault(f => f.Metadata.IsPrimaryKey())?.CurrentValue?.ToString(),
EntityName = entry.Metadata.Name,
UserName = _contextAccessor?.HttpContext?.User?.Name.ToString(),
};
switch (entry.State)
{
case EntityState.Added:
auditEntity.ChangeType = ChangeType.Add;
auditEntity.Changes = GetChanges(entry.Properties, e => true).ToList();
foreach (var entityChange in auditEntity.Changes)
entityChange.OldValue = null;
break;
case EntityState.Modified:
auditEntity.ChangeType = ChangeType.Edit;
auditEntity.Changes = GetChanges(entry.Properties, e => e.IsModified).ToList();
break;
case EntityState.Deleted:
auditEntity.ChangeType = ChangeType.Remove;
break;
}
return auditEntity;
}
private IEnumerable<EntityPropertyChange> GetChanges(IEnumerable<PropertyEntry> properties,
Func<PropertyEntry, bool> predicate) => properties
.Where(predicate)
.Select(property =>
new EntityPropertyChange
{
PropertyName = property.Metadata.Name,
OldValue = property.OriginalValue?.ToString(),
NewValue = property.CurrentValue?.ToString()
});
}
I use IAuditableEntity (an empty interface) to mark entities that I want to capture changes.
public class CustomerEntity : IAuditableEntity
{
...
}
You can also use Audit.NET library to capture changes.
So I have the following setup:
PLANNING:
public class Planning : ViewModelBase
{
public Planning()
{
AddNewActivityCommand = new RelayCommand(AddActivity, CanAddActivity);
}
public ObservableCollection<PlanningItem> PlanningItems { get; set; }
public PlanningItem SelectedPlan { get; set; }
#region AddNewActivity
public RelayCommand AddNewActivityCommand { get; private set; }
private bool CanAddActivity()
{
if (!PlanningItems.Any())
{
return true;
}
if (string.IsNullOrEmpty(PlanningItems[PlanningItems.Count - 1].Activities) != true ||
PlanningItems[PlanningItems.Count - 1].DhpRepresentativeSelected != null)
{
return true;
}
return false;
}
private void AddActivity()
{
PlanningItems.Add(new PlanningItem());
AddNewActivityCommand.RaiseCanExecuteChanged();
}
#endregion
}
PLANNING ITEM:
public class PlanningItem : ViewModelBase
{
private string _activity;
public ObservableCollection<OutreachUser> DhpRepresentativeSource
{
get
{
var userSource = new ObservableCollection<OutreachUser>();
using (var context = new Outreach_Entities())
{
var query = from a in context.UserInfoes
join b in context.PersonalInfoes on a.UserIdentity equals b.PersonIdentity
join c in context.PersonalTitles on b.TitleLink equals c.TitleIdentity into cGroup
from c in cGroup.DefaultIfEmpty()
select new OutreachUser
{
PersonLink = a.UserIdentity,
Username = a.Username,
FirstName = b.FirstName,
MiddleInitial = b.MiddleInitial,
LastName = b.LastName
};
foreach (var result in query)
{
userSource.Add(result);
}
return userSource;
}
}
}
public OutreachUser DhpRepresentativeSelected { get; set; }
public DateTime PlanningDate { get; set; }
public TimeSpan PlanningStart { get; set; }
public TimeSpan PlanningEnd { get; set; }
public int PlanningTotalHours { get; set; }
public string Activities
{
get
{
return _activity;
}
set
{
_activity = value;
RaisePropertyChanged(nameof(Activities), "", _activity, true);
}
}
}
I have a ListBox bound to the PlanningItems Observable Collection.
I want to be able to add a new item to the list if the following criteria are met:
The Planning Items Collection is empty.
The last item in the Planning Items Collection has a DhpRepresentativeSelected that is not null.
The last item in the Planning Items Collection has some text in the Activities string.
The first item is easy enough because I call AddNewActivityCommand.RaiseCanExecuteChanged(); after I add a new item from an empty list.
Now I need to call the AddNewActivityCommand.RaiseCanExecuteChanged(); from within the PlanningItem ViewModel, but it does not have access rights to the command.
Clueless pointed me to the answer.
What I did was inside of my Planning ViewModel I created an internal Method that called the AddNewActivityCommand.RaiseCanExecuteChanged() method. I think called that method from within the PlanningItems ViewModel.
I am using Simple Membership and a UserProfile table that maintains UserId and UserName:
public partial class UserProfile
{
public UserProfile()
{
this.webpages_Roles = new List<webpages_Roles>();
}
public int UserId { get; set; }
public string UserName { get; set; }
public virtual ICollection<webpages_Roles> webpages_Roles { get; set; }
}
With Entity Framework I am running the following which is inside my Context:
public partial class UowContext : DbContext
// code to set up DbSets here ...
public DbSet<Content> Contents { get; set; }
private void ApplyRules()
{
var r1 = new Random();
var r2 = new Random();
foreach (var entry in this.ChangeTracker.Entries()
.Where(
e => e.Entity is IAuditableTable &&
(e.State == EntityState.Added) ||
(e.State == EntityState.Modified)))
{
IAuditableTable e = (IAuditableTable)entry.Entity;
if (entry.State == EntityState.Added)
{
e.CreatedBy = // I want to put the integer value of UserId here
e.CreatedDate = DateTime.Now;
}
e.ModifiedBy = // I want to put the integer value of UserId here
e.ModifiedDate = DateTime.Now;
}
}
Here is the schema showing how user information is stored. Note that I store the integer UserId and not the UserName in the tables:
public abstract class AuditableTable : IAuditableTable
{
public virtual byte[] Version { get; set; }
public int CreatedBy { get; set; }
public DateTime CreatedDate { get; set; }
public int ModifiedBy { get; set; }
public DateTime ModifiedDate { get; set; }
}
Here's an example of a controller action that I use:
public HttpResponseMessage PostContent(Content content)
{
try
{
_uow.Contents.Add(content);
_uow.Commit();
var response = Request.CreateResponse<Content>(HttpStatusCode.Created, content);
return response;
}
catch (DbUpdateException ex)
{
return Request.CreateErrorResponse(HttpStatusCode.Conflict, ex);
}
}
I then have:
public class UowBase : IUow, IDisposable
{
public UowBase(IRepositoryProvider repositoryProvider)
{
CreateDbContext();
repositoryProvider.DbContext = DbContext;
RepositoryProvider = repositoryProvider;
}
public IRepository<Content> Contents { get { return GetStandardRepo<Content>(); } }
and:
public class GenericRepository<T> : IRepository<T> where T : class
{
public GenericRepository(DbContext dbContext)
{
if (dbContext == null)
throw new ArgumentNullException("An instance of DbContext is required to use this repository", "context");
DbContext = dbContext;
DbSet = DbContext.Set<T>();
}
public virtual void Add(T entity)
{
DbEntityEntry dbEntityEntry = DbContext.Entry(entity);
if (dbEntityEntry.State != EntityState.Detached)
{
dbEntityEntry.State = EntityState.Added;
}
else
{
DbSet.Add(entity);
}
}
How can I determine the UserId from inside of my Context so I can populate the Id in my tables?
In Code you will have UserName with you through:
HttpContext.Current.User.Identity.Name
you can than query UserProfile table against that Name and get the UserId from there and than assign it to ModifiedBy attribute.
Make sure that you query UserProfile table outside the foreach loop :)
In order to create a more elegant solution I'm curios to know your suggestion about a solution to persist a collection.
I've a collection stored on DB.
This collection go to a webpage in a viewmodel.
When the go back from the webpage to the controller I need to persist the modified collection to the same DB.
The simple solution is to delete the stored collection and recreate all rows.
I need a more elegant solution to mix the collections and delete not present record, update similar records ad insert new rows.
this is my Models and ViewModels.
public class CustomerModel
{
public virtual string Id { get; set; }
public virtual string Name { get; set; }
public virtual IList<PreferredAirportModel> PreferedAirports { get; set; }
}
public class AirportModel
{
public virtual string Id { get; set; }
public virtual string AirportName { get; set; }
}
public class PreferredAirportModel
{
public virtual AirportModel Airport { get; set; }
public virtual int CheckInMinutes { get; set; }
}
// ViewModels
public class CustomerViewModel
{
[Required]
public virtual string Id { get; set; }
public virtual string Name { get; set; }
public virtual IList<PreferredAirporViewtModel> PreferedAirports { get; set; }
}
public class PreferredAirporViewtModel
{
[Required]
public virtual string AirportId { get; set; }
[Required]
public virtual int CheckInMinutes { get; set; }
}
And this is the controller with not elegant solution.
public class CustomerController
{
public ActionResult Save(string id, CustomerViewModel viewModel)
{
var session = SessionFactory.CurrentSession;
var customer = session.Query<CustomerModel>().SingleOrDefault(el => el.Id == id);
customer.Name = viewModel.Name;
// How can I Merge collections handling delete, update and inserts ?
var modifiedPreferedAirports = new List<PreferredAirportModel>();
var modifiedPreferedAirportsVm = new List<PreferredAirporViewtModel>();
// Update every common Airport
foreach (var airport in viewModel.PreferedAirports)
{
foreach (var custPa in customer.PreferedAirports)
{
if (custPa.Airport.Id == airport.AirportId)
{
modifiedPreferedAirports.Add(custPa);
modifiedPreferedAirportsVm.Add(airport);
custPa.CheckInMinutes = airport.CheckInMinutes;
}
}
}
// Remove common airports from ViewModel
modifiedPreferedAirportsVm.ForEach(el => viewModel.PreferedAirports.Remove(el));
// Remove deleted airports from model
var toDelete = customer.PreferedAirports.Except(modifiedPreferedAirports);
toDelete.ForEach(el => customer.PreferedAirports.Remove(el));
// Add new Airports
var toAdd = viewModel.PreferedAirports.Select(el => new PreferredAirportModel
{
Airport =
session.Query<AirportModel>().
SingleOrDefault(a => a.Id == el.AirportId),
CheckInMinutes = el.CheckInMinutes
});
toAdd.ForEach(el => customer.PreferedAirports.Add(el));
session.Save(customer);
return View();
}
}
My environment is ASP.NET MVC 4, nHibernate, Automapper, SQL Server.
Well, if "elegant" is just "don't clear and recreate all" (untested) :
var airports = customer.PreferedAirports;
var viewModelAirports = viewModel.PreferredAirports;
foreach (var airport in airports) {
//modify common airports
var viewModelAirport = viewModelAirports.FirstOrDefault(m => m.AirportId == airport.AirportId);
if (viewModelAirport != null) {
airport.X = viewModelAirport.X;
airport.Z = viewModelAirport.Z;
//remove commonAirports from List
viewModelAirports.Remove(viewModelAirport);
continue;
}
//delete airports not present in ViewModel
customer.PreferedAirports.Remove(airport);
}
//add new airports
foreach (var viewModelAirport in viewModelAirports) {
customer.PreferedAirports.Add(new PreferredAirportModel {
Airport = session.Query<AirportModel>().SingleOrDefault(a => a.Id == el.AirportId),
CheckInMinutes = el.CheckInMinutes
});
}
session.Save(customer);