ChangeTracking | Track changes in POCO objects | Aspect Oriented library
kandi X-RAY | ChangeTracking Summary
kandi X-RAY | ChangeTracking Summary
Track changes in your POCO objects, and in your collections. By using Castle Dynamic Proxy to create proxies of your classes at runtime, you can use your objects just like you used to, and just by calling the AsTrackable() extension method, you get automatic change tracking, and cancellation. All trackable POCOs implement IChangeTrackable, IRevertibleChangeTracking, IChangeTracking, IEditableObject and INotifyPropertyChanged. And all trackable collections implement IChangeTrackableCollection, IBindingList ICancelAddNew, INotifyCollectionChanged , IList, IList, ICollection, ICollection, IEnumerable and IEnumerable.
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QUESTION
In my application I am using unit of work and repository pattern and auto mapper
This is the employeeDto
ANSWER
Answered 2022-Apr-12 at 08:19The problem is when you map the Dto to Employee the FkJobTitleNavigation will be evaluated, and when try to adding an entity with child (in this case is JobTitle) EF try to add child after parent inserted (parent is employee) so all you need to solve your problem is remove the child like this:
QUESTION
I seem to have this error when I insert something into my database table now. It is meant to auto-increment the id when adding a new item, and it has been working for months and I don't remember changing it so no idea why this is happening:
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware: Error: An unhandled exception has occurred while executing the request.
Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details. ---> Npgsql.PostgresException (0x80004005): 23502: null value in column "Id" of relation "VeganItems" violates not-null constraint
DETAIL: Failing row contains (null, new item33, Aa, A, 0, 0, 0, 0, [{"Id":5,"IconCodePoint":63279,"Name":"Condiments"},{"Id":11,"Ic..., {}, GroceryItem, null, null, null, null, null, null, null, null, null, null, 2022-03-13 14:29:40.995771, 2022-03-13 14:29:40.995771, null, KbnrgvYIt5UgTFohyyaSQ1GDIp02). at Npgsql.Internal.NpgsqlConnector.g__ReadMessageLong|213_0(NpgsqlConnector connector, Boolean async, DataRowLoadingMode dataRowLoadingMode, Boolean readingNotifications, Boolean isReadingPrependedMessage) at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming, CancellationToken cancellationToken) at Npgsql.NpgsqlDataReader.NextResult() at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken) at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken) at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior) at Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.ExecuteReader() at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReader(RelationalCommandParameterObject parameterObject) at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection) Exception data: Severity: ERROR SqlState: 23502 MessageText: null value in column "Id" of relation "VeganItems" violates not-null constraint Detail: Failing row contains (null, new item33, Aa, A, 0, 0, 0, 0, [{"Id":5,"IconCodePoint":63279,"Name":"Condiments"},{"Id":11,"Ic..., {}, GroceryItem, null, null, null, null, null, null, null, null, null, null, 2022-03-13 14:29:40.995771, 2022-03-13 14:29:40.995771, null, KbnrgvYIt5UgTFohyyaSQ1GDIp02). SchemaName: public TableName: VeganItems ColumnName: Id File: execMain.c Line: 1889 Routine: ExecConstraints --- End of inner exception stack trace --- at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection) at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable1 commandBatches, IRelationalConnection connection) at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IList1 entries) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IList1 entriesToSave) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(StateManager stateManager, Boolean acceptAllChangesOnSuccess) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<>c.b__104_0(DbContext _, ValueTuple2 t) at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlExecutionStrategy.Execute[TState,TResult](TState state, Func3 operation, Func3 verifySucceeded) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess) at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess) at Microsoft.EntityFrameworkCore.DbContext.SaveChanges() at Vepo.DataContext.VepoContext.SaveChanges() in /Users/benjaminfarquhar/dev/vepo_back_end/Vepo.DataContext/VepoContext.cs:line 48 at Vepo.Data.VeganItemEstablishmentsRepository3.Insert(TVeganItemEstablishment entity) in /Users/benjaminfarquhar/dev/vepo_back_end/Vepo.Data/Repositories/VeganItemEstablishments/VeganItemEstablishmentsRepository.cs:line 62 at Vepo.Services.VeganItemEstablishmentsService4._InsertVeganItemEstablishment(TVeganItemEstablishmentDto entity) in /Users/benjaminfarquhar/dev/vepo_back_end/Vepo.Services/VeganItemEstablishments/VeganItemEstablishmentsService.cs:line 240 at Vepo.Services.VeganItemEstablishmentsService4._handleNewVeganItem(TVeganItemEstablishmentDto veganItemEstablishment, ServiceResponse1 _response) in /Users/benjaminfarquhar/dev/vepo_back_end/Vepo.Services/VeganItemEstablishments/VeganItemEstablishmentsService.cs:line 153 at Vepo.Services.VeganItemEstablishmentsService4.AddOrUpdate(TVeganItemEstablishmentDto entity) in /Users/benjaminfarquhar/dev/vepo_back_end/Vepo.Services/VeganItemEstablishments/VeganItemEstablishmentsService.cs:line 104 at Vepo.Web.Controllers.VeganItemEstablishmentsController4.PostVeganItemEstablishment(TVeganItemEstablishmentDto veganItemEstablishment) in /Users/benjaminfarquhar/dev/vepo_back_end/Vepo.Web/Controllers/VeganItemEstablishment/VeganItemEstablishmentsController.cs:line 34 at lambda_method321(Closure , Object ) at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context) dbug: 03/13/2022 14:29:41.271 CoreEventId.
The code is just:
protected DbSet veganItems;
...ANSWER
Answered 2022-Mar-13 at 02:34Your entity configuration does not autoincrement the Id.
Update VeganItem COnfiguration and Add this line in addition to AddKey.
QUESTION
I have been looking through the net for the past few days but still couldn't get what I want. Maybe is my way for researching is wrong. But here's the problem I have an Order Model
...ANSWER
Answered 2022-Mar-06 at 04:18Try something like this
QUESTION
I'm trying to Deploy .Net 6 app with multiple projects to Linux Elastic Beanstalk Server from mac development machine. I'm having trouble querying the api after it has been deployed. I've done it in 2 ways - Just an EC2 instance by following this tutorial, just using command line, and through Elastic beanstalk console. So I have 2 EC2 instances. They both say they are running.
The project has one Asp.Net app (Vepo.Web) and 5 helper projects for the app layers. the "Vepo" project is just a placeholder I made because the internet told me there is a bug when you name your dll different to your solution; and the solution is "Vepo.sln".
The files created by the publish look like this:
I got the source code to deploy by cd into my asp.net core web app (Vepo.Web), then run dotnet publish -r linux-x64 --self-contained false --output build, then go to "Vepo.Web/build" in finder. Then select all files > right-click > compress (do not compress the parent folder!). That creates "archive.zip". Then upload "archive.zip" in the Elastic Beanstalk Console. And now it looks like this:
But I don't seem to be able to query the api. In Postman I'm trying:
ec2-54-xxx-xxx-95.ap-southeast-2.compute.amazonaws.com:5001/Users
but I get:
Error: connect ECONNREFUSED 54.xxx.xxx.95:5000
And navigating to it gives me:
I have created these inbound rules to allow anyone in because I'm desperately trying to get in:
Can someone help me be able to hit endpoints in my web API without getting 404/401? I will give any information required if I'm missing something.
UPDATE: I guess the app is running when I ssh into it and run this command (no idea how to access it from postman or my app, going to this in the browser does not work https://ec2-54-xxx-xxx-53.ap-southeast-2.compute.amazonaws.com:5001/fashionitems/search?searchTerm=B¤tPage=1&pageSize=10):
...ANSWER
Answered 2022-Mar-02 at 10:43The answer basically try summarizing the different comments posted in the question.
The problem can be motivated for many different reasons.
The most important thing to keep in mind is that EB provides a nginx proxy for serving the application.
By default this proxy expects your application to listen on port 5000.
According to the logs you provided, the application seems to start properly and it successfully connect to the database.
As you pointed out, it reports that the application is listening on http://localhost:5000: it may not be a problem, but perhaps your application is listening only in a certain network interface/address.
Just to be sure, and in fact, at the end it seems to be the solution, configure your application Kestrel server to listen on the mask http://*:5000, using .UseUrls("http://*:5000") in your Startup class, for instance. This article provides several different options for configuring where the application should listen to.
QUESTION
I am having problems with EclipseLink change tracking in one of my entity classes in a Java SE application. I am using Java 8, JPA 3.0 provided by EclipseLink 3.0.2 and HyperSQL 2.6.1. So far I have kept my implementation provider-independent, so switching JPA providers is an option, although not preferable.
This particular entity class has ~10 attributes of the type OverriddenValue, each of which is a wrapper for 1. a reference to a particular global configuration value, and 2. an optional custom value which will override the global value if present.
ANSWER
Answered 2022-Feb-16 at 20:44Try marking the mapping as mutable:
QUESTION
I discovered one problem while creating my project. If someone refer to the issue I will be grateful. In my project I use a layered model. The repository layer (data access layer) that communicates with the database (DB) and the service layer (business logic layer) in which services and objects are implemented (data transfer object).
As a result, there is a problem with the dbSet.Update method. When object (obj) comes into Update method as parameter, during the method call of the _db.Entry(dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) ?? obj).State = EntityState.Modified or _db.Update(dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) ?? obj) in the case of the first user's update (like from "view.xaml") obj is update and changes saving in the database (because dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) returns null and obviously my obj gets into the _db.Update method). In case of a repeated user's update (in the "view.xaml" view) object obj -- when it gets into the _db.Update(dbSet.Local.FirstOrDefault(i => i.Id == obj.Id) ?? obj) method, it isn't take account, as the data context already tracks it and in the _db.Update method gets an object from dbSet.Local.FirstOrDefault(i => i.Id == obj.Id). Everything would be fine if this object in dbSet.Local was updated according to the type that comes from the user. However, this is not the case, it is tracked but not changed when the user edits its properties. It is not tracked properly rather due to the fact that I use services and, accordingly, data transfer object entities.
In view of the foregoing, I have a question. How to make to update entity (by a new modified object) that are tracked, or how to manually assign the necessary object in dbSet.Local to replace the one stored there? or how to make Microsoft.EntityFrameworkCore.ChangeTracking not track changes to my objects in any way?
In order to make changes not tracked I used the QueryTrackingBehavior.NoTracking parameter for the DbContextOptionsBuilder entity, but this only helps on the first load, and tracking is still used when the data is updated further. I also used the dbSet.Local.Clear() methods, but this is a bad idea, as data updating due to the deletion of the previous data from the database (like delete 20 rows from table and add one updated).
...ANSWER
Answered 2022-Feb-16 at 18:36It's unusual to be so heavily coupled to the local cache. The normal pattern is to call DbSet.Find(id), and update the properties of the entity that it returns.
QUESTION
I need to find what code is causing an entity to be modified. In my .Net Core Winforms XAF EF app When I go into a detail view and click close I get a message asking me to save, even though I have not edited anything.
I added a listener to my ViewController as follows
...ANSWER
Answered 2022-Feb-16 at 02:31 private void ObjectSpace_ModifiedChanged(object sender, System.EventArgs e)
{
var os = sender as EFCoreObjectSpace;
foreach (var entry in os.DbContext.ChangeTracker.Entries())
{
foreach (var p in entry.Properties)
{
if (p.IsModified)
{
Debug.Print($"{p.Metadata.Name} {p.OriginalValue} IS NOW {p.CurrentValue}");
}
}
}
}
QUESTION
I simply want to get my entities from the db:
...ANSWER
Answered 2021-Nov-04 at 18:01I got it working after changing the name of my backing field to
QUESTION
Postgres database contains product table with natural primary key:
...ANSWER
Answered 2021-Oct-23 at 16:01Since you are changing a primary key , as a matter of fact it is not updating , but adding a new product. So
Create a new product from existing one, that will have a new product code
Update ALL items from all tables that have the previous product code, replacing the previous foreign key, with the new one.
After this you can delete the previous product.
If you try to turn off validation and change the code, after this your db will be broken, and you will not be able to use it again, since you will constantly have the integration error.
QUESTION
I looked through the documentation and several other answers but could not find what my problem was. I have a one to many relationship with Student and ReportCard like so
ANSWER
Answered 2021-Sep-05 at 15:33you have a bug in CourseGrade class
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