Linq EF --> Contains condition does not work - entity-framework

I have a problem: I have this table
ID
Title
GenreID
Genre
Duration
1
Movie1
1,2
Cartoon, Family
80
2
Movie2
3,4
Horror, Drama
76
3
Movie3
4
Drama
110
4
Movie4
1,2
Cartoon, Family
200
I need to filter by Genre, I make my query in this way, For example if I want all movies with Genre Cartoon (2), I make:
request.genre = 2
var query1 = from q in Movies
select new Response.MovieResponse
{
MovieId = q.MovieId,
Name = q.Title,
Genres = q.Genre,
GenreIds = q.GenreID
};
if (request != null)
{
if (!string.IsNullOrEmpty(request.Title))
query1 = query1.Where(co => co.Name.StartsWith(request.name));
if (!string.IsNullOrEmpty(request.genre))
if (int.Parse(request.genre) > 0)
{
query1.AsEnumerable().Where(ca =>
request.genre .Any(x => ca.GenreIds.Contains(x)));
}
}
List<Response.StoreResponse> stores = new List<Response.StoreResponse>();
stores = await query1.ToListAsync();
I expected 2 records inside but the filter on genre does not work. I always have back all movies. The filter by title run
I tried
if (!string.IsNullOrEmpty(request.category))
if (int.Parse(request.category) > 0)
{
string[] cat = { request.category };
var q1 = query1.Where(ca => ca.CategoriesIds.Contains(cat.ToString()));
l = q1.ToList();
}
but I have error:
The LINQ expression 'DbSet<Store>()
.Join(
inner: DbSet<Country>(),
outerKeySelector: s => s.CountryId,
innerKeySelector: c => (Nullable<int>)c.CountryId,
resultSelector: (s, c) => new TransparentIdentifier<Store, Country>(
Outer = s,
Inner = c
))
.Join(
inner: DbSet<City>(),
outerKeySelector: ti => ti.Outer.CityId,
innerKeySelector: c0 => (Nullable<long>)c0.CityId,
resultSelector: (ti, c0) => new TransparentIdentifier<TransparentIdentifier<Store, Country>, City>(
Outer = ti,
Inner = c0
))
.Where(ti0 => ti0.Outer.Outer.StatusId == (Nullable<int>)2)
.Where(ti0 => DbSet<Operator>()
.Where(o => EF.Property<Nullable<Guid>>(ti0.Outer.Outer, "StoreId") != null && object.Equals(
objA: (object)EF.Property<Nullable<Guid>>(ti0.Outer.Outer, "StoreId"),
objB: (object)EF.Property<Nullable<Guid>>(o, "StoreId")))
.Count() > 0)
.Where(ti0 => string.Join<long>(
separator: ",",
values: DbSet<StoresCategory>()
.Where(s0 => EF.Property<Nullable<Guid>>(ti0.Outer.Outer, "StoreId") != null && object.Equals(
objA: (object)EF.Property<Nullable<Guid>>(ti0.Outer.Outer, "StoreId"),
objB: (object)EF.Property<Nullable<Guid>>(s0, "StoreId")))
.Select(s0 => s0.CategoryId)
.ToList()).Contains(__ToString_0))' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.

Related

EF Core - Order by on filtered left join properties

I would like to generate this SQL query in entity framework
SELECT FunctionalAssets.Name, FunctionalAssetStructurePath.Path
FROM FunctionalAssets
LEFT JOIN FunctionalAssetStructurePath ON FunctionalAssets.Id =
FunctionalAssetStructurePath.FunctionalAssetId AND
FunctionalAssetStructurePath.StructureConfigurationId = 'A8A41B14-0A35-45D3-2A2B-08D904A3CD0B'
ORDER BY FunctionalAssetStructurePath.Path, FunctionalAssets.Name
OFFSET 0 ROWS FETCH NEXT 100 ROWS ONLY
I try with this code (but I know that it won't work)
var result = context.FunctionalAssets
.Include(x => x.FunctionalAssetsStructurePaths.Any(y => y.StructureConfigurationId == configurationId))
.OrderBy(x => x.FunctionalAssetsStructurePaths.Select(y => y.Path))
.ThenBy(x => x.Name)
.Skip(0)
.Take(100)
.AsNoTracking()
.Select(x => x.Name)
.ToList();
Have you an idea how to do this ?
Thank you
I found a solution.
var result = context.FunctionalAssets
.GroupJoin(context.FunctionalAssetStructurePathModel.Where(y => y.StructureConfigurationId == 'A8A41B14-0A35-45D3-2A2B-08D904A3CD0B'),
fa => fa.Id,
fasp => fasp.FunctionalAssetId,
(fa, fasp) => new { fa, fasp })
.SelectMany(x => x.fasp.DefaultIfEmpty(), (x, p) => new { x.fa, p.Path })
.OrderBy(x => x.Path)
.Skip(0)
.Take(100)
.ToList();
And the generated SQL query is :
SELECT [f].[Id], [f].[Name], [t].[Path]
FROM [FunctionalAssets] AS [f]
LEFT JOIN (
SELECT [f0].[FunctionalAssetId], [f0].[Path]
FROM [FunctionalAssetStructurePath] AS [f0]
WHERE [f0].[StructureConfigurationId] = 'A8A41B14-0A35-45D3-2A2B-08D904A3CD0B'
) AS [t] ON [f].[Id] = [t].[FunctionalAssetId]
ORDER BY [t].[Path]
OFFSET 0 ROWS FETCH NEXT 100 ROWS ONLY

Ef core 5 many to many filter

This is my query
public async Task<IEnumerable<Menu>> GetMenuByRolesAsync(string[] roles)
{
var result= await _context.Menus//.Include(o => o.Parent)
.Include(m => m.Childrens)
.ThenInclude(m => m.Childrens)
.Include(m => m.Roles.Where(r => roles.Contains(r.Name))) --it is not filtering basd on roles
.Where(m => m.ParentId == null)
.ToListAsync();
}
It is generating below query
-- #__roles_0='System.String[]' (DbType = Object)
SELECT m.id, m.icon, m.name, m.parent_id, m.url, t.role_id, t.menu_id, t.id, t.concurrency_stamp, t.name, t.normalized_name
FROM security.menu AS m
LEFT JOIN (
SELECT r.role_id, r.menu_id, r0.id, r0.concurrency_stamp, r0.name, r0.normalized_name
FROM security.role_menu AS r
INNER JOIN security.role AS r0 ON r.role_id = r0.id
WHERE r0.name = ANY (#__roles_0) OR ((r0.name IS NULL) AND (array_position(#__roles_0, NULL) IS NOT NULL))
) AS t ON m.id = t.menu_id
WHERE (m.parent_id IS NULL)
ORDER BY m.id, t.role_id, t.menu_id, t.id
This is Many to many configuration
// many to many
builder.HasMany(r => r.Menus)
.WithMany(r => r.Roles)
.UsingEntity<RoleMenu>(
j => j
.HasOne(rm => rm.Menu)
.WithMany(m => m.RoleMenus)
.HasForeignKey(rm => rm.MenuId),
j => j
.HasOne(rm => rm.Role)
.WithMany(r => r.RoleMenus)
.HasForeignKey(rm => rm.RoleId),
j =>
{
j.ToTable("role_menu", schema: "security");
j.HasKey(rm => new { rm.RoleId, rm.MenuId });
});
i need to filter menus based on roles..But it is not filtering based on roles..Am getting all the roles..I checked generated query..Please let me know what is the issue..
You are mixing filtered include with entity filtering.
Filtered include
.Include(m => m.Roles.Where(r => roles.Contains(r.Name)))
just filters the items in the related collection (menu roles in this case).
In order to filter the entity set (menus in this case), you need to replace it with the usual Where oparator, which for the desired filtering will be
.Where(m => m.Roles.Any(r => roles.Contains(r.Name)))

Convert SQL Command to lambda expression

If possible, please guide me how to convert my SQL command to lambda expression
select d.* from takcontractdet d where d.contractid=pubcontractid and d.personid in
(
select p.id from personel p where p.parentid=pubparentid)
)
Two query
var personelIds = Personels.Where(p => p.ParentId == pubparentid)
.Select(e => e.Id).ToList();
var result = Takcontractdets.Where(d => d.contractid == pubcontractid &&
personelIds.Contains(d.PersonId)).ToList();
One query
var result = Takcontractdets.Where(d => d.contractid == pubcontractid &&
Personels.Where(p => p.ParentId == pubparentid)
.Select(e => e.Id).ToList().Contains(d.PersonId))
.ToList();

Entity Framework Core: combining multiple result objects into one collection

I am facing this linq query for entity framework core (2.0).
var result = await dbContext.Table1DbSet
.Where(t1e => t1e.Id == id && t1e.Id2 == id2)
.Select
(
t1e =>
t1e.Table2NavPropICollection.Select
(
t2e => new
{
singleObject = t2e.Table3NavPropObject.TargetObject,
enumerable1 = t2e.Table3NavPropObject.Table4NavPropObject.Table5NavPropICollection.Select(t5e => t5e.TargetObject),
enumerable2 = t2e.Table3NavPropObject.Table6NavPropObject.Table7NavPropICollection.Select(t7e => t7e.TargetObject),
enumerable3 = t2e.Table3NavPropObject.Table8NavPropICollection.SelectMany(t8e => t8e.Table9NavPropICollection.Select(t9e => t9e.TargetObject))
}
)
)
.ToListAsync();
The goal is to query all the referenced instances of TargetObject which is referenced accros ~ 10 different tables.
Currently it returns an IEnumerable where the anonymous object contains the properties singleObject, enumerable1, enumerable2, enumerable3. All those properties are of type TargetObject or IEnumerable.
Can I, and how, rewrite the query to not return anonymous objects but just an IEnumerable containing all the values?
For some reason the compiler won't let me iterate over the anonymous collection and flatten it manually.
This should do the trick if you want one array per t1e row.
var result = await dbContext.Table1DbSet
.Where(t1e => t1e.Id == id && t1e.Id2 == id2)
.Select
(
t1e =>
t1e.Table2NavPropICollection.Select
(
t2e => new[] {t2e.Table3NavPropObject.TargetObject}.Concat(
t2e.Table3NavPropObject.Table4NavPropObject.Table5NavPropICollection.Select(t5e => t5e.TargetObject)).Concat(
t2e.Table3NavPropObject.Table6NavPropObject.Table7NavPropICollection.Select(t7e => t7e.TargetObject)).Concat(
t2e.Table3NavPropObject.Table8NavPropICollection.SelectMany(t8e => t8e.Table9NavPropICollection.Select(t9e => t9e.TargetObject)))
)
)
.ToListAsync();
If you want it completely flat, you'll want to switch that Select to a SelectMany().
var result = await dbContext.Table1DbSet
.Where(t1e => t1e.Id == id && t1e.Id2 == id2)
.SelectMany
(
t1e =>
t1e.Table2NavPropICollection.Select
(
t2e => new[] {t2e.Table3NavPropObject.TargetObject}.Concat(
t2e.Table3NavPropObject.Table4NavPropObject.Table5NavPropICollection.Select(t5e => t5e.TargetObject)).Concat(
t2e.Table3NavPropObject.Table6NavPropObject.Table7NavPropICollection.Select(t7e => t7e.TargetObject)).Concat(
t2e.Table3NavPropObject.Table8NavPropICollection.SelectMany(t8e => t8e.Table9NavPropICollection.Select(t9e => t9e.TargetObject)))
)
)
.ToListAsync();
Is Add and/or Concat a possible solution?
PoC:
var a = new [] { 1,2,3 };
var result = new {
firstA = a.First(),
otherAs = a,
backwards = a.Reverse()
};
var final = new List<int>();
final.Add(result.firstA);
final.Concat(result.otherAs.Concat(result.backwards))
.Dump();

How to dynamically change property in lambda expression

I have written a function below. In second line of code I have written "Where(t => t.PickTicket == EmployeeId)". I want to change (t.PickTicket) property dynamically. How can I achieve this??? And how can I make below code more better and shorter?
Thanks in advance.
public List<TicketJoin> GetTicketJoin(string EmployeeId)
{
var query = _context.tickets.Where(t => t.PickTicket == EmployeeId).Join
(
_context.employees, t => t.CreatedBy, e => e.EmployeeId, (t, e) => new
{
t.Id,
e.Employee_Name,
e.Department,
e.Location,
t.Subject,
t.MainCatId,
t.SubCatId,
t.PickTicket,
t.Status,
t.CreateDate
}).Join
(
_context.MainCategory, t => t.MainCatId, m => m.MainCatId, (t, m) => new
{
t.Id,
t.Employee_Name,
t.Department,
t.Location,
t.Subject,
t.MainCatId,
m.MainCatName,
t.SubCatId,
t.PickTicket,
t.Status,
t.CreateDate
}).Join
(
_context.SubCategory, t => t.SubCatId, s => s.SubCatId, (t, s) => new
{
t.Id,
t.Employee_Name,
t.Department,
t.Location,
t.Subject,
t.MainCatId,
t.MainCatName,
t.SubCatId,
s.SubCatName,
t.PickTicket,
t.Status,
t.CreateDate
}).ToList();
var TicketJoin = query.ToList().Select(r => new TicketJoin
{
EmployeeName = r.Employee_Name,
Subject = r.Subject,
Location = r.Location,
MainCatName = r.MainCatName,
SubCatName = r.SubCatName,
CreateDate = r.CreateDate
}).ToList();
return TicketJoin;
}
}
How can I make it shorter?
By using database view to hide all those joins. In such case you will have have only simple query with single condition.
How can I make it dynamic?
Do you really need it dynamic? You can just do this:
public List<TicketJoin> GetTicketJoin(Expression<Func<Ticket, bool>> condition)
{
var query = _context.Tickets.Where(condition)...
}
and call it
var result = this.GetTicketJoin(t => t.PickTicket == employeeId);
It is not fully dynamic but it allows calling code specifying the condition.
Fully dynamic solution where you would be able to pass the property name as string requires using Expression trees to build query. There also used to be Dynamic-Linq library for this purpose.