I have the following code:
public class WorkOrderByUserId : AbstractMultiMapIndexCreationTask<WorkOrderByUserId.Result>
{
public WorkOrderByUserId()
{
this.AddMap<WorkOrder>(items
=> from item in items
select new Result
{
OwnerId = item.OwnerId,
WorkOrder = new WorkOrderLookupDto
{
Id = item.Id,
Name = item.EventName
},
WorkOrders = null
});
this.AddMap<Invoice>(items
=> from item in items
select new Result
{
OwnerId = item.WorkOrder.OwnerId,
WorkOrder = new WorkOrderLookupDto
{
Id = item.WorkOrder.Id,
Name = item.WorkOrder.EventName
},
WorkOrders = null
});
this.Reduce = results => from result in results
group result by result.OwnerId
into g
select new Result
{
OwnerId = g.Key,
WorkOrders = g.Select(x => x.WorkOrder),
WorkOrder = null
};
this.Indexes.Add(x => x.OwnerId, FieldIndexing.Default);
}
public class Result
{
public string OwnerId { get; set; }
public IEnumerable<WorkOrderLookupDto> WorkOrders { get; set; }
public WorkOrderLookupDto WorkOrder { get; set; }
}
}
It gets me very close to where I want to be, however I seem to be missing something and I'm losing information and I'm not sure why.
Using the Map/Reduce Visualizer I notice the MAP is displaying the Results (i.e. WorkOrders is populated, and WorkOrder is null)
As this point I was expecting to have a bunch of items with NULL WorkOrders and a valid WorkOrder, which I expected to reduce down into the WorkOrders collection.
When I look at the final reduce in the visualizer, I notice my WorkOrder is NULL and my WorkOrders are missing entirely.
And when I look at the FINAL result of the Index I see what I'm looking for, just without the actual data I'm looking for.
What do I need to change to get my final WorkOrders to NOT be NULL?
I was able to get my desired result using the following code:
public class WorkOrderByUserId : AbstractMultiMapIndexCreationTask<WorkOrderByUserId.Result>
{
public WorkOrderByUserId()
{
this.AddMap<WorkOrder>(items
=> from item in items
select new Result
{
OwnerId = item.OwnerId,
WorkOrders = new[]
{
new WorkOrderLookupDto
{
Id = item.Id,
Name = item.EventName
}
}
});
this.AddMap<Invoice>(items
=> from item in items
select new Result
{
OwnerId = item.WorkOrder.OwnerId,
WorkOrders = new[]
{
new WorkOrderLookupDto
{
Id = item.WorkOrder.Id,
Name = item.WorkOrder.EventName
}
}
});
this.Reduce = results => from result in results
group result by result.OwnerId
into g
select new Result
{
OwnerId = g.Key,
WorkOrders = g.SelectMany(x => x.WorkOrders)
};
this.Indexes.Add(x => x.OwnerId, FieldIndexing.Default);
}
public class Result
{
public string OwnerId { get; set; }
public IEnumerable<WorkOrderLookupDto> WorkOrders { get; set; }
}
}
i have one webapi app in which i have one code to populate a table in the view
the controller(Home) code is
[HttpGet]
public List<Employee> GetEmployees()
{
var com = new TrainingDBEntities();
var records = from emp in com.tblEmployees
select new Employee
{
empID = emp.empID,
empName = emp.empName,
skill=emp.skill,
};
return records.ToList();
}
and in view
//show emp details
$('#btshw').click(function () {
$.ajax({
url: "/Home/GetEmployees",
success: function (result) {
console.log(result);
for (var i = 0; i < result.length; i++) {
var Row = "<tr><td>";
Row += result[i].empID + "</td><td>";
Row += result[i].empName + "</td><td>";
Row += result[i].skill + "</td><td>";
$('#emplist').append(Row);
}
$('#emplist').append("</table>");
}
,
error: function (err) {
alert(err.status.Text);
}
});
});
but after execution i got a table having 3 columns and all having values 'undefined' , i have debug the code and in the onclick event its going to the controller and it returns the correct value but data is not correct when reaching in the view(in ajax code)
You can change the result type to JsonResult:
[HttpGet]
public JsonResult GetEmployees()
{
var com = new TrainingDBEntities();
var records = from emp in com.tblEmployees
select new Employee
{
empID = emp.empID,
empName = emp.empName,
skill = emp.skill,
};
return Json(records.ToList(), JsonRequestBehavior.AllowGet);
}
I have the following action
public ActionResult ViewModelProducts()
{
var listOfProductsBuy = db.ProductsBuy.Select(x => new ProductBuyViewModel
{
Id = x.Id,
Title = x.Title,
ProductBuyId = x.Id,
Author = x.Author,
MasterImageUrl = x.Images.FirstOrDefault().Url,
Price = x.Price,
Values = x.Value,
}).ToList();
var listOfProductsRent = db.ProductsRent.Select(y => new ProductRentViewModel
{
Id = y.Id,
Title = y.Title,
MasterImageUrl = y.ImagesRent.FirstOrDefault().Url,
ProductRentId = y.Id,
Author = y.Author,
Period = y.Period.PeriodOfTime,
Price = y.Price,
Values = y.Value,
}).ToList();
var listOfProductsSearch = db.ProductSearches.Select(z => new ProductSearchViewModel
{
Id = z.Id,
Title = z.Title,
ProductSearchId = z.Id,
Author = z.Author,
MasterImageUrl = z.ImagesSearch.FirstOrDefault().Url,
Price = z.Price,
Values = z.Value,
}).ToList();
var viewModel = new AllProductsViewModel { ProductBuy = listOfProductsBuy, ProductRent = listOfProductsRent, ProductSearch = listOfProductsSearch};
return View(viewModel);
}
I want to implement paging for more than one viewmodel. If there is way with PagedList it will be better, but if there is not it will be ok too.
In order to add paging, you can install PagedList.MVC Nuget package. You can see the exact step by step procedure to add it on Microsoft website here. Check out the section named: "Add Paging to the Students Index Page". Hope this helps.
I have three tables jobs,categories and job_categories with similar to below structure:
**jobs**
id title desc
**categories**
id name
**job_categories**
id job_id category_id
So I want to retrieve all the jobs belongs to a particular category. For that I wrote an action view() in CategoriesController.php
function view($category_id = NULL)
{
if($category_id != NULL)
{
$conditions['JobCategory']['category_id'] = $category_id;
$all_jobs = $this->Job->find('all',array('conditions' => $conditions));
$this->set('all_jobs',$all_jobs);
}
}
And added a $hasMany to Category.php model:
class Category extends AppModel {
var $name = 'Category';
var $hasMany = array('JobCategory');
}
But when I checked the view , it shows error:
Error: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'JobCategory' in 'where clause' and the query it generates :
SELECT Job.id, Job.job_title, Job.job_description,
Job.job_skills, Job.contact_number, Job.contact_email,
Job.qualification_id, Job.experience, Job.categories,
Job.remarks, Job.support_image, Job.freshers_apply,
Job.added_on, Job.status, Qualification.id,
Qualification.name FROM cakead.jobs AS Job LEFT JOIN
cakead.qualifications AS Qualification ON
(Job.qualification_id = Qualification.id) WHERE JobCategory =
('1')
try this
//AppModel.php
public $actAs = array('Containable');
//Category.php
class Category extends AppModel {
var $name = 'Category';
var $hasAndBelongsTo = array('Category');
}
//CategoriesController.php
function view($category_id = NULL)
{
if($category_id != NULL)
{
$conditions['Category']['id'] = $category_id;
$all_jobs = $this->Category->find('all',array('conditions' => $conditions));
$this->set('all_jobs',$all_jobs);
}
}
I'm trying to work with grouped data coming back from SQL.
The method I'm writing is to provide the data for a "Case Status Overview" screen.
It must produce a nested XML document.
Now, I could do it the easy way, but I'm trying to learn whether it's possible to use the linq "group by" statement and then to project the data already nested. (the easy way would be just to pull back the data in a tabular fashion from the database and then for-loop through it forming the Xml document for output)
Here is the data hierarchy:
Every Case has a DebtType and every DebtType has a Client.
Here is the SQL that retrieves the data:
SELECT ClientNames.ClientID ,
ClientNames.ClientCode ,
ClientNames.ClientName ,
DebtTypes.DebtTypeID ,
DebtTypes.DebtTypeShortDesc ,
DebtTypes.DebtTypeLongDesc ,
Cases.CurrentStateCode ,
SUM(1 - CAST(Cases.CaseClosed AS INT)) AS OpenCaseCount ,
SUM(CAST(Cases.CaseClosed AS INT)) AS ClosedCaseCount ,
SUM(CAST(Cases.CaseOnHold AS INT)) AS OnHoldCaseCount ,
SUM(CAST(Cases.CaseReferred AS INT)) AS ReferredCaseCount ,
COUNT(Cases.CaseID) AS TotalCaseCount ,
SUM(Cases.CaseTotalPaid) AS TotalAmountPaid ,
SUM(Cases.CaseCurrentOutstandingAmount) AS TotalAmountOutstanding,
SUM(Cases.CaseTotalDebtWrittenOff) AS TotalAmountWrittenOff ,
SUM(Cases.CaseTotalDebtCancelled) AS TotalAmountCancelled
FROM ClientNames
INNER JOIN ClientDebtTypes
ON ClientNames.ClientID = ClientDebtTypes.ClientID
INNER JOIN DebtTypes
ON ClientDebtTypes.DebtTypeID = DebtTypes.DebtTypeID
INNER JOIN Cases
ON ClientDebtTypes.ClientDebtTypeID = Cases.CaseClientDebtTypeID
GROUP BY ClientNames.ClientID ,
ClientNames.ClientCode ,
ClientNames.ClientName ,
DebtTypes.DebtTypeID ,
DebtTypes.DebtTypeShortDesc,
DebtTypes.DebtTypeLongDesc ,
Cases.CurrentStateCode
ORDER BY ClientNames.ClientID,
DebtTypes.DebtTypeID,
CurrentStateCode
Using Linqer it converts it to:
from clientnames in db.ClientNames
join clientdebttypes in db.ClientDebtTypes on clientnames.ClientID equals clientdebttypes.ClientID
join debttypes in db.DebtTypes on clientdebttypes.DebtTypeID equals debttypes.DebtTypeID
join cases in db.Cases on new { ClientDebtTypeID = clientdebttypes.ClientDebtTypeID } equals new { ClientDebtTypeID = cases.CaseClientDebtTypeID }
group new {clientnames, debttypes, cases} by new {
clientnames.ClientID,
clientnames.ClientCode,
clientnames.ClientName1,
debttypes.DebtTypeID,
debttypes.DebtTypeShortDesc,
debttypes.DebtTypeLongDesc,
cases.CurrentStateCode
} into g
orderby
g.Key.ClientID,
g.Key.DebtTypeID,
g.Key.CurrentStateCode
select new {
ClientID = (System.Int32?)g.Key.ClientID,
g.Key.ClientCode,
g.Key.ClientName1,
DebtTypeID = (System.Int32?)g.Key.DebtTypeID,
g.Key.DebtTypeShortDesc,
g.Key.DebtTypeLongDesc,
g.Key.CurrentStateCode,
OpenCaseCount = (System.Int64?)g.Sum(p => 1 - Convert.ToInt32(p.cases.CaseClosed)),
ClosedCaseCount = (Int32?)g.Sum(p => Convert.ToInt32(p.cases.CaseClosed)),
OnHoldCaseCount = (Int32?)g.Sum(p => Convert.ToInt32(p.cases.CaseOnHold)),
ReferredCaseCount = (Int32?)g.Sum(p => Convert.ToInt32(p.cases.CaseReferred)),
TotalCaseCount = (Int64?)g.Count(p => p.cases.CaseID != null),
TotalAmountPaid = (System.Decimal?)g.Sum(p => p.cases.CaseTotalPaid),
TotalAmountOutstanding = (System.Decimal?)g.Sum(p => p.cases.CaseCurrentOutstandingAmount),
TotalAmountWrittenOff = (System.Decimal?)g.Sum(p => p.cases.CaseTotalDebtWrittenOff),
TotalAmountCancelled = (System.Decimal?)g.Sum(p => p.cases.CaseTotalDebtCancelled)
}
Now as I mentioned, I could stop there and right a for loop to create the Xml data.
But I'm trying to create a nested group (IGrouping<ClientName,IGrouping<DebtType,SummaryClass>>)
and then project the data in a nested format.
Now we're using LinqToXsd to create strong type wrappers for out Xml documents, but essentially all this means is that out output type is:
private class ClientSummary
{
public string ClientName { get; set; }
public IList<DebtTypeSummary> DebtTypes { get; set; }
}
private class DebtTypeSummary
{
public string DebtType { get; set; }
public IList<StateCodeSummary> StateCodes { get; set; }
}
private class StateCodeSummary
{
public string StateCode { get; set; }
public int TotalCount { get; set; }
public decimal TotalAmountPaid { get; set; }
//etc
//etc
//etc
}
Now I got as far as writing the following Linq:
var grouping = from cases in db.Cases
join clientdebttypes in db.ClientDebtTypes on cases.CaseClientDebtTypeID equals clientdebttypes.ClientID
join debttypes in db.DebtTypes on clientdebttypes.DebtTypeID equals debttypes.DebtTypeID
group cases by new ClientDebtTypePair() { ClientDebtType = clientdebttypes, DebtType = debttypes } into casesByClientDebtTypes
join clientnames in db.ClientNames on casesByClientDebtTypes.Key.ClientDebtType.ClientName equals clientnames
group casesByClientDebtTypes by clientnames;
var projected = from casesByClientDebtTypes in grouping
let client = casesByClientDebtTypes.Key
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType()
{
Client = new Client()
{
ClientID = client.ClientID,
DisplayName = client.ClientName1,
},
DebtTypes = from cases in casesByClientDebtTypes
let debttype = cases.Key.DebtType
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType.DebtTypesLocalType()
{
DebtType = new DebtType()
{
DebtTypeID = debttype.DebtTypeID,
Description = debttype.DebtTypeLongDesc,
DisplayName = debttype.DebtTypeShortDesc,
},
StatesCodes = from cases2 in cases
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType.DebtTypesLocalType.StatesCodesLocalType()
{
ClosedCasesCount = cases2.Sum(p => Convert.ToInt32(p.cases.CaseClosed))
which joins and groups the database tables and then tries to project the result a ClientSummary (the class names are different but that's because the above is a simplified view of the output classes). I fail completely when I've drilled all the way down to the Cases table and I find that I don't really understand how to do agregate functions. They appear to only be available on IGrouping<K, T>s and it seems I've just got confused.
I need to also ensure that the summaries are calculated server side, pulling back millions of cases would be bad.
Can anybody help me with this one? Is this even possible?
Regards,
James.
-------### UPDATE 1 ###-------
OK, been working on this again today.
I decided to use Linq2SQL to pull pack 2D data and then reformat it using Linq2Objects.
Here is what I started with:
var sql = from clientnames in db.ClientNames
join clientdebttypes in db.ClientDebtTypes on clientnames.ClientID equals clientdebttypes.ClientID
join debttypes in db.DebtTypes on clientdebttypes.DebtTypeID equals debttypes.DebtTypeID
join cases in db.Cases on new { ClientDebtTypeID = clientdebttypes.ClientDebtTypeID } equals new { ClientDebtTypeID = cases.CaseClientDebtTypeID }
group new { clientnames, debttypes, cases } by new
{
clientnames.ClientID,
clientnames.ClientCode,
clientnames.ClientName1,
debttypes.DebtTypeID,
debttypes.DebtTypeShortDesc,
debttypes.DebtTypeLongDesc,
cases.CurrentStateCode
} into g
orderby
g.Key.ClientID,
g.Key.DebtTypeID,
g.Key.CurrentStateCode
select new
{
Client = new Client{ ClientID = g.Key.ClientID, DisplayName = g.Key.ClientName1 },
DebtType = new DebtType{ DebtTypeID = g.Key.DebtTypeID, DisplayName = g.Key.DebtTypeShortDesc, Description = g.Key.DebtTypeLongDesc },
StateSummary = new LoadCaseStatusOverviewScreenOutput.ClientsLocalType.DebtTypesLocalType.StatesCodesLocalType()
{
StateCode = g.Key.CurrentStateCode,
OpenCasesCount = g.Sum(p => 1 - Convert.ToInt32(p.cases.CaseClosed)),
ClosedCasesCount = g.Sum(p => Convert.ToInt32(p.cases.CaseClosed)),
OnHoldCasesCount = g.Sum(p => Convert.ToInt32(p.cases.CaseOnHold)),
ReferredCasesCount = g.Sum(p => Convert.ToInt32(p.cases.CaseReferred)),
TotalCasesCount = g.Count(p => p.cases.CaseID != null),
TotalAmountPaid = g.Sum(p => p.cases.CaseTotalPaid),
TotalAmountOutstanding = g.Sum(p => p.cases.CaseCurrentOutstandingAmount),
TotalAmountWrittenOff = g.Sum(p => p.cases.CaseTotalDebtWrittenOff),
TotalAmountCancelled = g.Sum(p => p.cases.CaseTotalDebtCancelled),
}
};
var res = sql.ToList();
output.Clients = (from results in res
group results by results.Client into resultsByClient
from resultsByDebtType in
(from results in resultsByClient
group results by results.DebtType)
group resultsByDebtType by resultsByClient.Key into resultsByDebtTypeByClient
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType()
{
Client = resultsByDebtTypeByClient.Key,
DebtTypes = (from resultsByDebtType in resultsByDebtTypeByClient
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType.DebtTypesLocalType()
{
DebtType = resultsByDebtType.Key,
StatesCodes = (from results in resultsByDebtType
let summary = results.StateSummary
select results.StateSummary).ToList()
}).ToList()
}).ToList();
That runs, but produces one Client/DebtType/Summary set for every result. So even though there is only one client in this case, I end up with 1300 clients, all identical.
I simplified it to the following:
output.Clients = (from results in res
group results by results.Client into resultsByClient
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType()
{
Client = resultsByClient.Key,
DebtTypes = null,
}).ToList();
That produces 1300 clients. Next I tried this:
output.Clients = (from results in res
group results by results.Client.ClientID into resultsByClient
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType()
{
Client = new Client { ClientID = resultsByClient.Key },
DebtTypes = null,
}).ToList();
And THAT produces ONE client (hurray!). Except I loose all the client information (boo!)
Guessing that as it's comparing client by refernce instead of by content I wrote the following:
public partial class Client
{
public static bool operator ==(Client left, Client right)
{
return left.ClientID == right.ClientID;
}
public static bool operator !=(Client left, Client right)
{
return left.ClientID != right.ClientID;
}
public override int GetHashCode()
{
return ClientID;
}
}
That did nothing. It repeatedly calls GetHashCode(), which I fudged to force it to return the same hash code for any matching ClientID, but it still created 1300 Client groups.
Regards,
James.
-------### UPDATE 2 ###-------
OK, I thought I would have a go at making the Linq2Sql output only simple values for grouping by:
g.Key.ClientID,
g.Key.ClientName1,
g.Key.DebtTypeID,
g.Key.DebtTypeShortDesc,
g.Key.DebtTypeLongDesc,
And then changed the test Linq2Objects to:
output.Clients = (from results in res
group results by new { ClientID = results.ClientID, DisplayName = results.ClientName1 } into resultsByClient
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType()
{
Client = new Client { ClientID = resultsByClient.Key.ClientID, DisplayName = resultsByClient.Key.DisplayName },
DebtTypes = null,
}).ToList();
That works. So anonymous types compare in the way I want them to, by content not reference (apparently)
This does not:
output.Clients = (from results in res
group results by new SiDemClient { ClientID = results.ClientID, DisplayName = results.ClientName1 } into resultsByClient
select new LoadCaseStatusOverviewScreenOutput.ClientsLocalType()
{
Client = resultsByClient.Key,//new Client { ClientID = resultsByClient.Key.ClientID, DisplayName = resultsByClient.Key.DisplayName },
DebtTypes = null,
}).ToList();
That still creates 1300 groups.
So, anonymous types compare in a magical way that I don't understand. How can I make my Client class compare like an anonymous type?
Regards,
James.
-------### SOLUTION FOUND ###-------
-------### MANY THANKS TO Enigmativity ###-------
I needed to override the Equals() method instead of implementing the == operator.
Now the grouping works and I have a wonderful Xml document to reutrn!
public partial class SiDemClient
{
public override bool Equals(object obj)
{
if (obj is SiDemClient)
{
return this.ClientID.Equals(((SiDemClient)obj).ClientID);
}
return false;
}
public override int GetHashCode()
{
return ClientID;
}
}
Many Thanks,
James.
When you override GetHashCode you must also override Equals. The == & != operators are irrelevant.
Try with this:
public partial class Client
{
public override bool Equals(object obj)
{
if (obj is Client)
{
return this.ClientID.Equals(((Client)obj).ClientID);
}
return false;
}
public override int GetHashCode()
{
return this.ClientID.GetHashCode();
}
}
See if that helps.