As ofObjectChanges is built on Object.observe() which is obsolete (https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/observe) I'm looking for an alternative for watching object property changes. Anyone know of one?
Perhaps using a Proxy is an option, though it's needed to replace the original object
const { Subject } = require('rxjs');
// Take an object, and return a proxy with an 'observation$' stream
const toObservableObject = targetObject => {
const observation$ = new Subject();
return new Proxy(targetObject, {
set: (target, name, value) => {
const oldValue = target[name];
const newValue = value;
target[name] = value;
observation$.next({ name, oldValue, newValue });
},
get: (target, name) => name == 'observation$' ? observation$ : target[name]
});
}
const observableObject = toObservableObject({ });
observableObject.observation$
.filter(modification => modification.name == 'something')
.subscribe(({ name, oldValue, newValue }) => console.log(`${name} changed from ${oldValue} to ${newValue}`));
observableObject.something = 1;
observableObject.something = 2;
The output
something changed from undefined to 1
something changed from 1 to 2
Look for Proxy in the compatibility table current node versions has full support)
https://kangax.github.io/compat-table/es6/
And documentation of the Proxy at
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Proxy
Related
I have this query:
Project = await Context.Projects.Where(x => x.Id == project.Id)
.Select(x => new ProjectModel
{
Id = project.Id,
Name = project.Name,
TreeDataDict = x.Tasks.Select(y => new TreeItemModel()
{
NodeId = y.Id,
ParentId = SetTaskParentId(y, y.Type),
NodeTitle = y.Name,
Expanded = false,
Object = new TaskBaseModel
{
Milestone = y.Milestone,
StartDate = y.StartDate,
CurrentEndDate = y.CurrentEndDate,
EndDate = y.EndDate,
},
Icon = TaskHelper.GetTaskIcon(y.Type),
Children = new List<TreeItemModel>()
}).ToDictionary(y => y.NodeId, y => y)
}).SingleOrDefaultAsync();
and also tried like this:
Project = await Context.Projects.Where(x => x.Id == project.Id)
.Select(x => new ProjectModel
{
Id = project.Id,
Name = project.Name,
TreeDataDict = x.Tasks.ToDictionary(y => y.Id, y => new TreeItemModel(
{
NodeId = y.Id,
ParentId = SetTaskParentId(y, y.Type),
NodeTitle = y.Name,
Expanded = false,
Object = new TaskBaseModel
{
Milestone = y.Milestone,
StartDate = y.StartDate,
CurrentEndDate = y.CurrentEndDate,
EndDate = y.EndDate,
},
Icon = TaskHelper.GetTaskIcon(y.Type),
Children = new List<TreeItemModel>()
})
}).SingleOrDefaultAsync();
Both ways I got this exception:
What could be causing this? and is there a way I could make this work without fetching as a list and then covert it to dictionary? What could be the most efficient way to achieve this?
Regards
What could be causing this?
Translation of the nested ToDictionary call (none of the available overloads) is not supported. Consider it one of the (many) current (latest at the time of writing official v5.0.11) EF Core shortcomings.
Interestingly though, the Dictionary<TKey, TValue> constructor overload with IEnumerable<KeyValuePair<TKey, TValue>> argument as well as projection (Select) to KeyValuePair<TKey, TValue> is supported, which gives the workaround - replace the ToDictionary call with the aforementioned constructor and Select, e.g. (replace int with the type of the Id)
TreeDataDict = new Dictionary<int, TreeItemModel>(
x.Tasks.Select(y => new TreeItemModel()
{
NodeId = y.Id,
ParentId = SetTaskParentId(y, y.Type),
NodeTitle = y.Name,
Expanded = false,
Object = new TaskBaseModel
{
Milestone = y.Milestone,
StartDate = y.StartDate,
CurrentEndDate = y.CurrentEndDate,
EndDate = y.EndDate,
},
Icon = TaskHelper.GetTaskIcon(y.Type),
Children = new List<TreeItemModel>()
})
.Select(e => new KeyValuePair<int, TreeItemModel>(e.NodeId, e)));
This will fix the current error. But note that you are using other non-translatable constructs (custom method calls like SetTaskParentId(y, y.Type) and TaskHelper.GetTaskIcon(y.Type)) which are supported only in the final Select, so make sure to not add LINQ operator like Where, OrderBy etc. after the root query Select(x => new ProjectModel { ... }, otherwise you'll get other runtime errors. ToList, `First
Im a bit confused with whats happening bellow:
Can anyone explain me why is dataType keep saying StatisticData instead of SibsMonthly??
dataType is a enum? passad as ref param to this method and its initialized as null before the method call..
Here is the code:
string errorMessage = null;
Enums.Uploads.DataType? dataType = null;
if (ValidadeFile(file, ref errorMessage, ref dataType))
{
...
}
private bool ValidadeFile(IBrowserFile file, ref string errorMessage, ref Enums.Uploads.DataType? dataType)
{
List<string> acceptedFileTypes = new List<string>
{
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
};
var valid = true;
if (AcceptedFileNames != null && AcceptedFileNames.Length > 0)
{
var tmp = AcceptedFileNames.Where(x => new Regex(x.Regex).IsMatch(file.Name))
.OrderByDescending(x => x.DataType)
.Select(x => x.DataType)
.FirstOrDefault();
dataType = tmp;
if (dataType == null)
{
valid = false;
errorMessage = Constants.Uploads.Error.InvalidFileName;
}
}
...
}
The WASM debugger doesn't seem to like ref variables, it seems to look at their address, not their value:
Inspecting them at their call site or in the Debug window behaves as expected; this is a debugger isssue.
I have following Expression Func which is receiving two input paramters, first is Person Object, second is bool and returning another type of Object PersonProfile
private Exression<Func<Person, bool, PersonProfile>> PersonProfileProjection => (person, isValid) =>
new PersonProfile
{
FirstName = person.FirstName,
HasAddress = isValid ? person.Address1 : null
};
And I am trying to call this while fetching Person table from dbContext.
_dbContext.Persons.Select(PersonProfileProjection);
I am confused how to send boolean parameter inside PersonProfileProjection. It works when I only put one input and one output parameter like this. But I want extra boolean input as well.
Any help would be highly appreciated.
You can follow Microsoft documentation for this : Expression Class
One sample created for SQLite that show above function usage.
public void GetData()
{
var connection = new SQLiteConnection(#"Data Source=database.sqlite;Version=3;");
var context = new DataContext(connection);
connection.Open();
var createtableQuery = #"
drop table Company;
CREATE TABLE[Company]
(
[ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
[Seats] INTEGER NOT NULL
);
";
var command = new SQLiteCommand(createtableQuery, connection);
command.ExecuteNonQuery();
Company com = new Company()
{
Id = 6,
Seats = 7
};
context.GetTable<Company>().InsertOnSubmit(com);
context.SubmitChanges();
var companies = context.GetTable<Company>();
foreach (var company in companies)
{
Console.WriteLine("Company: {0} {1}",
company.Id, company.Seats);
}
//compile Expression using Compile method to invoke it as Delegate
Func<int,int, Company> PersonProfileProjectionComp = PersonProfileProjection.Compile();
var dd = companies.Select(p => PersonProfileProjectionComp(p.Id,p.Seats));
//// Below line inline use. Both works.
//var dd = companies.Select(p => PersonProfileProjection.Compile().Invoke(p.Id,p.Seats));
}
private System.Linq.Expressions.Expression<Func<int, int, Company>> PersonProfileProjection => (person, seats) =>
new Company
{
Id = person,
Seats = seats
};
or in one line use this :
PersonProfileProjection.Compile().Invoke(person, isValid)
You could declare it as a Func instead of an expression:
private Func<Person, bool, PersonProfile> PersonProfileProjection => (person, isValid) =>
new PersonProfile
{
FirstName = person.FirstName,
HasAddress = isValid // do what you meant to do
};
... and call it as:
_dbContext.Persons.Select(p => PersonProfileProjection(p, true));
You could as well write an ordinary method:
private PersonProfile PersonProfileProjection(Person person, bool isValid)
{
return new PersonProfile
{
FirstName = person.FirstName,
HasAddress = isValid // do what you want to do
};
}
...and call it the same way:
_dbContext.Persons.Select(p => PersonProfileProjection(p, true));
I am trying to test my ViewComponent with XUnit.
When I debug through the component and set a break point right before it returns the Component View, the model is set.
Here is the simple model I am returning.
public class IntDashMakeRecAssgnmntsPoRespMngrVM
{
public IEnumerable<Audit> Audits { get; set; }
}
And I am trying to assert the Audits.Count() is greater than 0.
Here is my View Component:
public class IntDashMakeRecAssgnmntsPoRespMngrViewComponent : ViewComponent
{
private IAuditRepository _auditRepo;
private IExternalRepository _externalRepo;
public IntDashMakeRecAssgnmntsPoRespMngrViewComponent(IAuditRepository auditRepo,
IExternalRepository externalRepo)
{
_auditRepo = auditRepo;
_externalRepo = externalRepo;
}
public IViewComponentResult Invoke()
{
ClaimsPrincipal user = HttpContext.Request.HttpContext.User;
short staffId = short.Parse(user.Claims.Single(c => c.Type == "StaffId").Value);
// Get all Internal Audits that are not closed and not completed
var audits = _auditRepo.Audits
.Include(a => a.Findings).ThenInclude(f => f.Recommendations).ThenInclude(r => r.Assignments)
.Where(a => a.StatusID != 3 && a.StatusID != 11);
var external = _externalRepo.ExternalRecords;
audits = audits.Where(a => !external.Any(e => e.AuditID == a.AuditID));
if (User.IsInRole("PAG_SPEC") && !User.IsInRole("PAG_ADMIN_INT"))
{
audits = audits.Where(a =>
a.Assignments.Any(assn => assn.AssignmentAuditId == a.AuditID
&& assn.AssignmentRoleId == 2 && assn.AssignmentStaffId == staffId));
}
// Where audit has a recommendation without an assigned PO Authorizer
// OR without an assigned Responsible Manager (Rec Level).
List<Audit> auditsToAssign = new List<Audit>();
foreach (Audit audit in audits)
{
foreach (Finding finding in audit.Findings)
{
foreach (Recommendation rec in finding.Recommendations)
{
if (!rec.Assignments.Any(asgn => asgn.AssignmentRoleId == 15)
|| !rec.Assignments.Any(asgn => asgn.AssignmentRoleId == 26)
)
{
auditsToAssign.Add(rec.Finding.Audit);
break;
}
}
}
}
IntDashMakeRecAssgnmntsPoRespMngrVM intDashMakeRecAssgnmntsPoRespMngrVM =
new IntDashMakeRecAssgnmntsPoRespMngrVM
{
Audits = auditsToAssign
};
return View("/Views/InternalAudit/Components/Dashboard/IntDashMakeRecAssgnmntsPoRespMngr/Default.cshtml", intDashMakeRecAssgnmntsPoRespMngrVM);
}
}
When I get to this line in debugging and break to inspect, I have 1 Audit which I want:
return View("/Views/InternalAudit/Components/Dashboard/IntDashMakeRecAssgnmntsPoRespMngr/Default.cshtml", intDashMakeRecAssgnmntsPoRespMngrVM);
Now here is my Unit Test:
[Fact]
public void ReturnsAudit_1Finding_1Rec_1Asgn_PONeeded_RespMnrAssigned()
{
// Arrange
var audits = new Audit[]
{
new Audit { AuditID = 1 }
};
var findings = new Finding[]
{
new Finding{ Audit = audits[0], FindingId = 1 } // 1 Finding
};
var recommendations = new List<Recommendation>()
{
new Recommendation // 1 Rec
{
Finding = findings[0],
Assignments = new List<Assignment>()
{
// PO Authorizor
new Assignment { AssignmentRoleId = 15 }
// No Responsible Manager
}
}
};
audits[0].Findings = findings;
findings[0].Recommendations = recommendations;
Mock<IAuditRepository> mockAuditRepo = new Mock<IAuditRepository>();
mockAuditRepo.Setup(m => m.Audits).Returns(audits.AsQueryable());
Mock<IExternalRepository> mockExternalRepo = new Mock<IExternalRepository>();
mockExternalRepo.Setup(m => m.ExternalRecords).Returns(
new External[0].AsQueryable()
);
// Act
var component = new IntDashMakeRecAssgnmntsPoRespMngrViewComponent(
mockAuditRepo.Object, mockExternalRepo.Object);
component.ViewComponentContext = new ViewComponentContext();
component.ViewComponentContext.ViewContext.HttpContext = TestContext;
var result =
component.Invoke() as IntDashMakeRecAssgnmntsPoRespMngrVM;
int auditCount = (result).Audits.Count();
// Assert
Assert.Equal(1, auditCount);
}
Why is result null on this line?
var result =
component.Invoke() as IntDashMakeRecAssgnmntsPoRespMngrVM;
I also tried this first and it is still null:
ViewComponentResult result =
component.Invoke() as ViewComponentResult;
int auditCount =
((IntDashMakeRecAssgnmntsPoRespMngrVM)result.Model).Audits.Count();
I figured it out.
I wasn't casting the result to the right type.
I had this:
ViewComponentResult result =
component.Invoke() as ViewComponentResult;
int auditCount =
((IntDashMakeRecAssgnmntsPoRespMngrVM)result.Model).Audits.Count();
It should be this:
var result =
component.Invoke() as ViewViewComponentResult;
int auditCount =
((IntDashMakeRecAssgnmntsPoRespMngrVM)result.ViewData.Model).Audits.Count();
ViewViewComponentResult instead of ViewComponentResult.
I want to create a Gatt Server in my Xamarin.Forms app so that other devices can scan for it via bluetooth. I am using this plugin:
https://github.com/aritchie/bluetoothle
This is my code to create a Gatt Server and advertise data:
server = CrossBleAdapter.Current.CreateGattServer();
var service = server.AddService(serviceGuid, true);
var characteristic = service.AddCharacteristic(
characteristicGuid,
CharacteristicProperties.Read |
CharacteristicProperties.Write | CharacteristicProperties.WriteNoResponse,
GattPermissions.Read | GattPermissions.Write
);
var notifyCharacteristic = service.AddCharacteristic
(
notifyCharacteristicGuid,
CharacteristicProperties.Indicate | CharacteristicProperties.Notify,
GattPermissions.Read | GattPermissions.Write
);
IDisposable notifyBroadcast = null;
notifyCharacteristic.WhenDeviceSubscriptionChanged().Subscribe(e =>
{
var #event = e.IsSubscribed ? "Subscribed" : "Unsubcribed";
if (notifyBroadcast == null)
{
notifyBroadcast = Observable
.Interval(TimeSpan.FromSeconds(1))
.Where(x => notifyCharacteristic.SubscribedDevices.Count > 0)
.Subscribe(_ =>
{
Debug.WriteLine("Sending Broadcast");
var dt = DateTime.Now.ToString("g");
var bytes = Encoding.UTF8.GetBytes("SendingBroadcast");
notifyCharacteristic.Broadcast(bytes);
});
}
});
characteristic.WhenReadReceived().Subscribe(x =>
{
var write = "HELLO";
// you must set a reply value
x.Value = Encoding.UTF8.GetBytes(write);
x.Status = GattStatus.Success; // you can optionally set a status, but it defaults to Success
});
characteristic.WhenWriteReceived().Subscribe(x =>
{
var write = Encoding.UTF8.GetString(x.Value, 0, x.Value.Length);
Debug.WriteLine("in WhenWriteReceived() value: " + write);
// do something value
});
await server.Start(new AdvertisementData
{
LocalName = "DariusServer",
ServiceUuids = new List<Guid>() { serverServiceGuid }
});
I am using this app to scan for my advertisement data:
https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp
I can't discover my app with it. I don't know what I'm doing wrong? I am testing with a real device, SM-T350 tablet
I spent countless hours to get this plugin to work with no luck. But this native code works for anyone else who has the same problem:
private async Task AndroidBluetooth()
{
try
{
await Task.Delay(5000); // just to make sure bluetooth is ready to go, this probably isn't needed, but good for peace of mind during testing
BluetoothLeAdvertiser advertiser = BluetoothAdapter.DefaultAdapter.BluetoothLeAdvertiser;
var advertiseBuilder = new AdvertiseSettings.Builder();
var parameters = advertiseBuilder.SetConnectable(true)
.SetAdvertiseMode(AdvertiseMode.Balanced)
//.SetTimeout(10000)
.SetTxPowerLevel(AdvertiseTx.PowerHigh)
.Build();
AdvertiseData data = (new AdvertiseData.Builder()).AddServiceUuid(new ParcelUuid(Java.Util.UUID.FromString("your UUID here"))).Build();
MyAdvertiseCallback callback = new MyAdvertiseCallback();
advertiser.StartAdvertising(parameters, data, callback);
}
catch(Exception e)
{
}
}
public class MyAdvertiseCallback : AdvertiseCallback
{
public override void OnStartFailure([GeneratedEnum] AdvertiseFailure errorCode)
{
// put a break point here, in case something goes wrong, you can see why
base.OnStartFailure(errorCode);
}
public override void OnStartSuccess(AdvertiseSettings settingsInEffect)
{
base.OnStartSuccess(settingsInEffect);
}
}
}
Just to note, it wouldn't work if if I included the device name, because the bluetooth transmission would be too large in that case with a service UUID (max 31 bytes I believe).