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Nhibernate: Conditional And Clause in QueryOver()

this is my query:
var query = _session.QueryOver<CRMPhoneCall>();
if (filter.Subject != null)
{
query.JoinQueryOver<CRMPhoneCall_Subject>
(p => p.PhoneCall_Subject)
.JoinQueryOver(d => d.Subject)
.And(s => s.Id == filter.Subject.Id) //check filter.Subject.Id has value else The condition does not apply
.And(s => s.Parent == null) //check filter.OnlyMainSubject has true else The condition does not apply;
}
two separate if for check filter.Subject And filter.OnlyMainSubject does not work(duplicate instance in QueryOver)

var query = session.QueryOver<CRMPhoneCall>();
if (filter.Subject != null)
{
var subjectQuery = query.JoinQueryOver<CRMPhoneCall_Subject>(p => p.PhoneCall_Subject)
.Where(s => s.Subject == filter.Subject);
if (filter.OnlyMainSubject)
{
subjectQuery.JoinQueryOver(ps => ps.Subject)
.Where(s => s.Parent == null); //check filter.OnlyMainSubject has true else The condition does not apply;
}
}

Updating multiple rows with different data with a specific id using Entity Framework Core

I have the following table:
I want to update ApproveStatus of rows with RequestId=2 where the goodsId = 4 is rejected and goodsId=1 is approved.
My question is how to do that using Entity Framework Core in ASP.NET Core 2.2.
This is what I have done so far:
// model contain "approve" and "reject" strings and requestId which came from view
public IActionResult ApproveList(List<ApprovedGoodsByAdminAssistVM> model)
{
// I got the requestId from model
var id = model.Select(s => s.RequestId).FirstOrDefault();
// Filtered the two record with RequestId=2 from the table
var goodsList = context.RequestGoodsBrand
.Where(x => x.RequestId == id).ToList();
}
What to do next?
Thanks in advance

If I'm not mistaken, these changes could solve your issue.
public IActionResult ApproveList(List<ApprovedGoodsByAdminAssistVM> model)
{
var id = model.Select(s => s.RequestId).FirstOrDefault();
var goodsList = context.RequestGoodsBrand
.Where(x => x.RequestId == id).ToList();
var rejectedItems = goodsList.Where(x => x.GoodsId == 4).ToList();
var approvedItems = goodsList.Where(x => x.GoodsId == 1).ToList();
foreach (var item in rejectedItems)
item.ApproveStatus = "rejected";
foreach (var item in approvedItems)
item.ApproveStatus = "approved"
context.SaveChanges();
}
Just instead of these magic words ('Rejected' , 'Approved'), you would better use an enum

public IActionResult ApproveList(List<ApprovedGoodsByAdminAssistVM> model)
{
var requestId = model.Select(x => x.RequestId).FirstOrDefault();
var approvedItems = model
.Where(x => x.RequestId == requestId && x.ApproveStatus == 1)
.Select(x => x.GoodsId).ToList();
var rejectedItems = model
.Where(x => x.RequestId == requestId && x.ApproveStatus == 0)
.Select(x => x.GoodsId).ToList();
var goodsToBeApproved = context.RequestGoodsBrand
.Where(x => x.RequestId == requestId && approvedItems.Contains(x.GoodsId)).ToList();
goodsToBeApproved.ForEach(x => x.IsApproved = 1);
context.SaveChanges();
var goodsToBeRejected = context.RequestGoodsBrand
.Where(x => x.RequestId == requestId && rejectedItems.Contains(x.GoodsId)).ToList();
goodsToBeRejected.ForEach(x => x.IsApproved = 0);
context.SaveChanges();
return Json("Done!");
}

LINQ method Except gives me System.ArgumentException for IQuareable

I have the following code for filtering my data:
public List<Customer> ShowCustomersForCurrentTemplate(PushTemplate pushTemplate)
{
string templateType = pushTemplate.TemplateType;
string timeType = pushTemplate.IntervalType;
DateTime clientStartDate = pushTemplate.ClientStartDateTime;
int eventOlderThan = pushTemplate.EventOlderThan;
int eventYoungerThan = pushTemplate.EventYoungerThan;
List<string> langs = pushTemplate.Messages?.Select(x => x.PushLang?.LangCode).ToList() ??
new List<string>();
List<string> packageIds = pushTemplate.PackageIds ?? new List<string>();
List<string> advertisers = pushTemplate.AdvertiserPushTemplates?.Select(x => x.Advertiser?.Name).ToList() ??
new List<string>();
string category = pushTemplate.Category?.Name;
DateTime eventOlderThanDate = DateTime.UtcNow;
DateTime eventYoungerThanDate = DateTime.UtcNow;
if (timeType == "days")
{
eventOlderThanDate = eventOlderThanDate.AddDays(0 - eventOlderThan);
eventYoungerThanDate = eventYoungerThanDate.AddDays(0 - eventYoungerThan);
}
else if (timeType == "minutes")
{
eventOlderThanDate = eventOlderThanDate.AddMinutes(0 - eventOlderThan);
eventYoungerThanDate = eventYoungerThanDate.AddMinutes(0 - eventYoungerThan);
}
var customers = _customerRepository.Customers
.Include(x => x.Application)
.ThenInclude(x => x.Advertiser)
.ThenInclude(x => x.Category)
.Include(x => x.CustomerEvents)
.Select(x => x);
// selection by category
customers = customers.Where(x => x.Application.Advertiser.Category.Name == category);
// selection by advertisers
customers = customers.Where(x => advertisers.Contains(x.Application.Advertiser.Name));
// selection by applications
customers = customers.Where(x => packageIds.Contains(x.Application.AppId));
// selection by locales
customers = customers.Where(x => langs.Contains(x.Locale));
if (templateType == "registration_and_not_deposit")
{
// selection by event type
customers = customers.Where(x => x.CustomerEvents
.Any(y => y.Customer.CreatedAt > clientStartDate && y.CreatedAt <= eventOlderThanDate &&
y.CreatedAt >= eventYoungerThanDate && y.EventType == "registration"));
// set of redundant events
var customersWithEventsForException =
customers.Where(x => x.CustomerEvents.Any(y => y.EventType == "deposit"));
// filter redundant events
customers = customers.Except(customersWithEventsForException);
}
else if (templateType == "opened_and_not_registration")
{
// отбор по типу события
customers = customers.Where(x => x.CustomerEvents
.Any(y => y.Customer.CreatedAt > clientStartDate && y.CreatedAt <= eventOlderThanDate &&
y.CreatedAt >= eventYoungerThanDate && y.EventType == "open"));
// selection be event
var customersWithEventsForException =
customers.Where(x => x.CustomerEvents.Any(y => y.EventType == "registration"));
// filter redundant events
customers = customers.Except(customersWithEventsForException);
}
// set of users who already had push
var alreadyHavePush = _pushRepository.Pushes
.Include(x => x.Customer)
.Where(x => x.PushTemplate.PushTemplateId == pushTemplate.PushTemplateId && x.Sent)
.Select(x => x.Customer);
// filter users, who already had push
var res = customers.Except(alreadyHavePush).Select(x => x).ToList();
return res;
}
Sorry for long method, but it's pretty simple. A make Where for IQueryable again and again then I use .ToList() for getting dinally filtered result.
Ok about the problem. It seems to me, that Except method gives me
System.ArgumentException: Expression of type 'System.Collections.Generic.IEnumerable1[Microsoft.EntityFrameworkCore.Query.Internal.AnonymousObject]' cannot be used for parameter of type 'System.Collections.Generic.IEnumerable1[System.Object]' of method 'System.Collections.Generic.IEnumerable1[System.Object] Except[Object](System.Collections.Generic.IEnumerable1[System.Object], System.Collections.Generic.IEnumerable`1[System.Object])'
I will show you this moment with debugger.
The first case. Here all is ok:
The second case:
I will not have kek2 because the described exception will be raised.
So what is wrong? It's impossible to use Except for IQuareable?
Here I will show the source code of customers repository:
public class CustomerRepository : ICustomerRepository
{
private readonly ApplicationDbContext _applicationContext;
public CustomerRepository(ApplicationDbContext applicationContext)
{
_applicationContext = applicationContext;
}
public IQueryable<Customer> Customers => _applicationContext.Customers;
...

EF Core: Distinct and OrderBy strange behavior

I migrate my old project to the new EF Core and found this problem
My old code:
private IQueryable<SeriesData> GetSeriesData(IQueryable<Series> query, long? userId = null)
{
DateTime date = DateTime.Today.AddMonths(1);
IQueryable<SeriesData> seriesDataQuery = query.Select(x => new SeriesData
{
Series = x,
Subscribed = userId.HasValue && x.Subscriptions.Any(y => y.UserId == userId),
CurrentSeasonNumber = x.Episodes.Where(z => z.ReleaseDate.HasValue && z.ReleaseDate < date).Max(y => y.SeasonNumber),
Channel = x.Channel,
Country = x.Channel.Country,
ReleaseGroups =
x.Episodes.SelectMany(z => z.Releases)
.Select(y => y.ReleaseGroup)
.Distinct() // 1
.OrderBy(y => y.Name) // 2
.Select(r => new ReleaseGroupData
{
ReleaseGroup = r,
Subscribed =
userId.HasValue &&
x.Subscriptions.Any(y => y.UserId == userId && y.ReleaseGroupId == r.Id)
}).ToList()
});
return seriesDataQuery;
}
When i execute this query i get "InvalidOperationException: Sequence contains more than one element" exception
But if i swap line 1 and 2 everything works.

Select two columns from the table via linq

I use the query below to get all columns(20 more) in Entity Framework Linq. Because of out of memory exception, I only want to get two of them. One is "FileName", the other one is "FilePath". How to modify my code?
var query = DBContext.Table1
.Where(c => c.FacilityID == facilityID && c.FilePath != null && c.TimeStationOffHook < oldDate)
.OrderBy(c => c.FilePath)
.Skip(1000)
.Take(1000)
.ToList();
foreach(var t in query)
{
Console.WriteLine(t.FilePath +"\\"+t.FileName);
}

var query = DBContext.Table1.Where(c => c.FacilityID == facilityID && c.FilePath != null && c.TimeStationOffHook < oldDate)
.OrderBy(c => c.FilePath)
.Skip(1000)
.Take(1000)
.Select(c => new { c.FilePath, c.FileName })
.ToList();
foreach(var t in query)
{
Console.WriteLine(t.FilePath +"\\"+t.FileName);
}
You need to use Select.

Just select out two of the columns:
DBContext.Table1.Select(c => new { c.FileName, c.FilePath });

How about something like
using (var entity = new MyModel(ConnectionString))
{
var query = (from myTable in entity.theTable
where myTable.FacilityID == facilityID &&
myTable.FilePath != null &&
myTable.TimeStationOffHook < oldDate
orderby myTable.FilePath
select new
{
myTable,FileName,
myTable.FilePath
}).Skip(1000).Take(1000).ToList();
//do what you want with the query result here
}