According to given project id(this id is coming to action as a parameter), I want to find this project and this project's issues and then I want to find some issues which has the "bug" type using linq queries in my MVC asp.net web application. But when I try below code in my action in ProjectController, I take this error: Cannot implicitly convert type 'System.Collection.Generic.List<System.Collections.Generic.List<MVCTest1.Models.Issue>>'to 'System.Collections.Generic.List<MVCTest1.Models.Issue>' and
List<Issue> issueList = (from i in db.Projects where i.projectID == projectId select i.Issues).ToList();
List<Issue> bugList = (from bug in issueList where bug. ) --> I cannot reach properties of bug issue
Here my project Model:
public class Project
{
public int projectID { get; set; }
public string projectName { get; set; }
public string descriptionProject { get; set; }
public Project parentProject { get; set; }
public string identifier { get; set; }
public DateTime date { get; set; }
public List<Project> subProjects { get; set; }
public virtual List<Issue> Issues { get; set; }
}
and my Issue Model:
public class Issue
{
public int issueID { get; set; }
public string description { get; set; }
public string subject { get; set; }
public IssueStatus? status { get; set; }
public Issue parentTask { get; set; }
public DateTime startDate { get; set; }
public DateTime dueDate { get; set; }
public int done { get; set; }
public IssuePriority? priority { get; set; }
public IssueType? type { get; set; }
public virtual List<User> Users { get; set; }
}
finally my enum:
public enum IssueType
{
Bug = 0,
Feature = 1,
Support = 2,
Operation = 3
}
Thanks in advance.
// edit 2
var project = db.Projects.Single(p => p.projectID == projectId);
var issues = project.Issues;
var bugIssues = from bug in issues where bug.type == 0 select bug;
return PartialView(bugIssues);
When I write this I got this error :
The model item passed into the dictionary is of type 'System.Linq.Enumerable+WhereListIterator1[MVCTest1.Models.Issue]', but this dictionary requires a model item of type 'System.Collections.Generic.List1[MVCTest1.Models.Issue]'.
The problem is that your Issues property is already a List<Issue>. I suspect you want something like:
// TODO: Fix property naming...
var project = db.Projects.Single(p => p.projectId == projectId);
var issues = project.Issues;
Now issues will be a List<Issue> rather than a List<List<Issue>>.
EDIT: For the next problem, you've got an IEnumerable<Issue> but you're expecting a List<Issue>, so you need to call ToList() at that point. For example:
var project = db.Projects.Single(p => p.projectId == projectId);
return PartialView(project.Issues.Where(b => b.type == 0).ToList());
The problem is in the expected model of the MVC view, it expects a System.Collections.Generic.List<T>, but you gave a System.Linq.Enumerable.
Try do this.
return PartialView(bugIssues.ToList());
Related
I'm using EF6 with ASP.Net. I'm trying to add items to the Jobs list in the following model:
EDIT:
My goal is to save the changes I make to the Timecards.Jobs list through a PUT method in such a way that I can retrieve them through a GET method.
public class Timecard
{
[Key]
public long TimecardID { get; set; }
[Required]
public DateTime StartDate { get; set; }
[Required]
public DateTime EndDate { get; set; }
[Required]
public long EmployeesID { get; set; }
[Required]
public decimal Hours { get; set; }
[Required]
public ICollection<int> Jobs { get; set; } = new List<int>();
public List<DateTime> Days { get; set; } = new List<DateTime>();
}
And I believe i'm doing so, i'm checking the states change in my PUT method:
// PUT: api/TimecardsAPI/5
[ResponseType(typeof(void))]
public IHttpActionResult PutTimecard(int id, Job job)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
try
{
Timecard card = db.Timecards.Where(x => x.TimecardID == id).First();
var state = db.Entry(card).State;
db.Timecards.Attach(card);
state = db.Entry(card).State;
card.Jobs.Add((int)job.JobID);
db.Entry(card).State = EntityState.Modified;
state = db.Entry(card).State;
var result = db.SaveChanges();
state = db.Entry(card).State;
var change = db.Timecards.Where(x => x.TimecardID == id).First().Jobs;
}
catch (DbUpdateConcurrencyException)
{
if (!TimecardExists(id))
{
return NotFound();
}
else
{
throw;
}
}
return StatusCode(HttpStatusCode.NoContent);
}
Before returning from the put method, i have a var change to check the results of the Jobs list once i'm done working on it. Before I leave the put method, the changes to the Jobs list are accurate. However, when I do a get, I get all the correct data EXCEPT the list. It comes back as a 0 length list. Here's my get method, which also has the jobs list in a variable. This is where the list comes back as size 0:
// GET: api/TimecardsAPI
public IQueryable<Timecard> GetTimecards()
{
var change = db.Timecards.Where(x => x.TimecardID == 6).First().Jobs;
//In this example, six is the id of the timecard in question. Only hardcoded here
//for debugging.
return db.Timecards;
}
and my dbcontext:
public class ClockedWebContext : DbContext
{
public ClockedWebContext() : base("name=ClockedWebContext")
{
}
public DbSet<Job> Jobs { get; set; }
public System.Data.Entity.DbSet<ClockedWeb.Models.PayPeriod> PayPeriods { get; set; }
public System.Data.Entity.DbSet<ClockedWeb.Models.Employee> Employees { get; set; }
public System.Data.Entity.DbSet<ClockedWeb.Models.Timecard> Timecards { get; set; }
}
There are many similar questions on SO but I have not found information yet that has helped me solve my issue. I have no idea what I'm doing wrong, but I've lost days on this and I could really use some help. thank you.
Generally storing multiples values in column is an indication of poor database design. Relational databases are designed specifically to store one value per row/column combination. In order to store more than one value, you must serialize your list into a single value for storage, then deserialize it upon retrieval or you can use many-to-one relationship then you should use an extra table with a foreign key constraint. There is no other way to do so in RDMS.
If you use serialize approach, then your model look like--
public class Timecard
{
[Key]
public long TimecardID { get; set; }
[Required]
public DateTime StartDate { get; set; }
[Required]
public DateTime EndDate { get; set; }
[Required]
public long EmployeesID { get; set; }
[Required]
public decimal Hours { get; set; }
[NotMapped]
public List<int> JobList { get; set; } = new List<int>();
[Required]
public string Jobs
{
get => string.Join(",", JobList);
set
{
if (string.IsNullOrEmpty(value)) JobList = new List<int>();
else
{
JobList = !string.IsNullOrWhiteSpace(value) && value.Contains(",")
? value.Split(',').Select(s => Convert.ToInt32(s.Trim())).ToList()
: !string.IsNullOrWhiteSpace(value) && !value.Contains(",")
? new List<int>()
: new List<int>();
}
}
}
//have to change also
public List<DateTime> Days { get; set; } = new List<DateTime>();//Follow previous technique
}
Then you can do your operation as you doing. just it's insert data as a coma separated string.
I am not getting you correctly but if you not getting the update after you changed your entity then can you please add below line
db.savechanges();
I have a code block regards get a list like that in aspnetzero:
public async Task<List<DMNCCThueSuatDto>> GetDSThueSuat()
{
using (_unitOfWorkManager.Current.SetTenantId(null))
{
var lstthueSuat = await _dmThueSuatRepository.Query(t => t.Where(i =>
i.IsDeleted == false)).OrderBy("thuesuat_ma asc").ToListAsync();
return ObjectMapper.Map<List<DMNCCThueSuatDto>>(lstthueSuat);
}
}
I expected a list of DMNCCThueSuatDto is returned but the error
Cannot create a DbSet for 'DM_NCC_ThueSuat' because this type is not
included in the model for the context.
is always displayed.
Also, i had myown a declaration
public virtual DbSet DS_ThueSuat { get; set; }
in my DBContext.
In my mariadb database, i had a table called "vs_dm_ncc_thuesuat"
and i have already declare a class for mapping to the table above
namespace VS.vHoaDon.Domains.DanhMuc.DMNhaCungCap
{
[Table("vs_dm_ncc_thuesuat")]
[MultiTenancySide(MultiTenancySides.Host)]
public class DM_NCC_ThueSuat : FullAuditedEntity
{
public int ThueSuat_Ma { get; set; }
public string ThueSuat_Ten { get; set; }
public int ThueSuat_GiaTri { get; set; }
public bool ThueSuat_HieuLuc { get; set; }
public DateTime? ThueSuat_BatDau { get; set; }
public DateTime? ThueSuat_KetThuc { get; set; }
}
}
I don't know why?
Any helps is appreciated.
Thank you so much.
I'm trying to use the feature documented here :
https://github.com/ServiceStack/ServiceStack.OrmLite#custom-sql-customizations
This is how I'm using it:
var q = Db.From<MemberAccess>().LeftJoin<Member>();
return Db.Select<MemberResponse>(q);
Response object:
public class MemberResponse
{
public Guid Id { get; set; }
public string MemberFirstName { get; set; }
public string MemberLastName { get; set; }
public string MemberEmail { get; set; }
[Default(OrmLiteVariables.SystemUtc)]
public string AccessedOn { get; set; }
[CustomSelect("CONCAT(LEFT(Member.FirstName, 1),LEFT(Member.LastName,1))")]
public string MemberInitial { get; set; }
}
It seems like whatever I put in CustomSelect doesn't get used. Maybe, I'm not using this correctly? Also, the Default attribute doesn't work either.I tried that as it was an example from the doco.
Any idea will be appreciated.
Thanks in advance.
The [CustomSelect] only applies to the source table. Selecting the results in a custom type is used to map the returned resultset on the MemberResponse type, it doesn't have any effect on the query that gets executed.
Likewise with [Default(OrmLiteVariables.SystemUtc)] that's used to define the default value when creating the table which is only used when it creates the Column definition, so it's only useful on the source Table Type.
Both these attributes should only be added on the source MemberAccess to have any effect, which your mapped MemberResponse can access without any attributes, e.g:
public class MemberResponse
{
public Guid Id { get; set; }
public string MemberFirstName { get; set; }
public string MemberLastName { get; set; }
public string MemberEmail { get; set; }
public string AccessedOn { get; set; }
public string MemberInitial { get; set; }
}
Sql.Custom() API
The new Sql.Custom() API added in v4.5.5 that's available on MyGet will let you select a custom SQL Fragment, e.g:
var q = Db.From<MemberAccess>().LeftJoin<Member>()
.Select<MemberAccess,Member>((a,m) => new {
Id = a.Id,
MemberFirstName = m.FirstName,
MemberLastName = m.LastName,
MemberEmail = m.Email,
MemberInitial = Sql.Custom("CONCAT(LEFT(Member.FirstName,1),LEFT(Member.LastName,1))")
});
return Db.Select<MemberResponse>(q);
Im trying to do a simple "LIKE" query using a LAMBDA expression using CreateDocumentQuery; however after trying .Contains and SqlMethod.Like and both times receiving the response NotImplementedException I don't know what to try next!
Update: As of 5/6/15, DocumentDB added a set of String functions including STARTSWITH, ENDSWITH, and CONTAINS. Please note that most of these functions do not run on the index and will force a scan.
LIKE and CONTAINS are not yet supported in DocumentDB.
You'll want to check out the DocumentDB feedback page and vote on features (e.g. LIKE and CONTAINS) to get your voice heard!
Because I only needed to search against a discreet subset of properties of the larger object I implemented a .Contains search function as below. It works as expected though I have no idea regarding performance or scalability.
Domain Models
public interface ITaxonomySearchable
{
string Name { get; set; }
string Description { get; set; }
}
public class TaxonomySearchInfo : ITaxonomySearchable {
[JsonProperty(PropertyName = "id")]
public Guid Id { get; set; }
[JsonProperty(PropertyName = "name")]
public string Name { get; set; }
[JsonProperty(PropertyName = "description")]
public string Description { get; set; }
}
public class TaxonomyContainer : ITaxonomySearchable
{
[JsonProperty(PropertyName = "id")]
public Guid Id { get; set; }
[JsonProperty(PropertyName = "userId")]
public string UserId { get; set; }
[JsonProperty(PropertyName = "name")]
public string Name { get; set; }
[JsonProperty(PropertyName = "description")]
public string Description { get; set; }
[JsonProperty(PropertyName = "tags")]
public string[] Tags { get; set; }
[JsonProperty(PropertyName = "taxonomy")]
public Node[] Taxonomy { get; set; }
}
Search method
public async static Task<List<TaxonomySearchInfo>> Search(string searchTerm)
{
var db = GetJsonDocumentDb.GetDb();
using (var client = GetJsonDocumentDb.GetClient())
{
var documentCollection = await GetJsonDocumentDb.GetDocumentCollection(db, client, "TaxonomyContainerCollection");
return client.CreateDocumentQuery<TaxonomySearchInfo>(documentCollection.DocumentsLink)
.AsEnumerable()
.Where(r => r.Name.Contains(searchTerm) || r.Description.Contains(searchTerm))
.ToList();
}
}
This is a follow up to an earlier question.
I want to populate a ViewModel, which has 3 properties, and one list of Occ class (which also has 3 properties.
public class RatesViewModel
{
public string TypeName { get; set; }
public long TypeID { get; set; }
public int TypeCount { get; set; }
public virtual IQueryable<Occ> Occs { get; set; }
}
public class Occ
{
public string occ { get; set; }
public decimal ratetocharge { get; set; }
public int numOfOcc { get; set; }
public virtual RatesViewModel RatesViewModel { get; set; }
}
When I run the following Linq query in LinqPad:
var rooms = tblRoom
.GroupBy(p => p.tblType)
.Select(g => new
{
TypeName = g.Key.type_name,
TypeID = g.Key.type_id,
TypeCount = g.Count(),
Occs = rates.Where(rt => rt.type_id == g.Key.type_id &&
(
(rt.type_id == g.Key.type_id)
))
.GroupBy(rt => rt.occ)
.Select(proj => new
{
occ = proj.Key,
ratetocharge = proj.Sum(s => s.rate),
numOfOcc = proj.Count()
})
});
rooms.Dump();
...as before, it correctly returns the data model I'm looking for:
...and when I click on Occs it drills down into the Occs class:
The complete view in LinqPad is:
My query in Visual Studio is:
var rooms = dbr.Rooms
.GroupBy(p => p.RoomTypes).Select(g => new RatesViewModel
{
TypeName = g.Key.type_name,
TypeID = g.Key.type_id,
TypeCount = g.Count()
,
Occs = db.Rates.Where(rt => rt.type_id == g.Key.type_id &&
(
(rt.type_id == g.Key.type_id)
))
.GroupBy(rt => rt.occ)
.Select(proj => new Occ
{
occ = proj.Key,
ratetocharge = proj.Sum(s => s.rate),
numOfOcc = proj.Count()
})
})
.ToList();
However when running this, I get an error:
The specified LINQ expression contains references to queries that are associated with different contexts.
I think I understand the error - but I'm not sure how to separate the query into 2 separate queries, and then join those query results together again to get my original results set.
My model classes are:
public class Rates
{
public int id { get; set; }
public long type_id { get; set; }
public DateTime ratedate { get; set; }
public decimal rate { get; set; }
public string occ { get; set; }
public List<RoomType> Type { get; set; }
}
public class Rental
{
[Key]
public long rental_id { get; set; }
public long room_id { get; set; }
public DateTime check_in { get; set; }
public DateTime check_out { get; set; }
public virtual Room Room { get; set; }
}
public class Room
{
[Key]
public long room_id { get; set; }
public long type_id { get; set; }
public virtual RoomType RoomTypes { get; set; }
public virtual ICollection<Rental> Rentals { get; set; }
}
public class RoomType
{
[Key]
public long type_id { get; set; }
public string type_name { get; set; }
public IQueryable<Rates> Rates { get; set; }
public virtual ICollection<Room> Room { get; set; }
}
Can anyone help either review my query or models, so it works with one query, or show me how to separate the query into two, and then combine the result sets?
Thank you,
Mark
apitest.Models.RoomContext' does not contain a definition for 'Rates'...
(your comment on hydr's answer)
Well, there you go: not only two different context instances but two different context classes. I suspect your linqpad query was directly against the database connection, which means it used one linq-to-sql DataContext (created on the fly).
You need to use one context class (and one instance of it) in your query. And connect to it in Linqpad to make sure you test the same query provider as Visual Studio.
dbr and db seem to be two different instances of the same context. But in one query you should only use one context. So I would suggest the following:
Occs = dbr.Rates.Where(rt => rt.type_id == g.Key.type_id && ....
If this doesn't help can you quote the lines where you initialize the contexts?