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How to get all the relation with filter

I have This object
public class ParentGroup
{
public int Id { get; set; }
public ParentGroup Parent { get; set; }
public int? ParentId { get; set; }
public ICollection<ParentGroup> Children { get; set; }
public ParentGroupType ParentGroupType { get; set; }
public int? ParentGroupTypeId { get; set; }
public bool Active { get; set; }
public string Code { get; set; }
public string Name { get; set; }
}
I'm trying to get all the parent with all the children but there is a something that happened with me and I can't understand if I put the where filter in the query I can't get all the data related to the children I got only the first level
If I removed it I get all the date with all the levels and I don't want to make the query to the DB, not my memory
This my code
public async Task<List<ParentGroup>> GetOrganizationStructureTree()
{
// var query = _context.ParentGroups.Where(x => x.ParentId == null);
List<ParentGroup> ParentGroups = await _context.ParentGroups.Include(par => par.Children).Include(par => par.Parent).Include(pr => pr.ParentGroupType).ToListAsync();
return ParentGroups;
}

Add data to List of object

I am relatively new to .net. I have a situation where I have a class
public class Product
{
public string sku { get; set; }
public string ean { get; set; }
public string price { get; set; }
public string description { get; set; }
public string long_description { get; set; }
public string img_url { get; set; }
public Size size { get; set; }
public Style style { get; set; }
public Brand brand { get; set; }
public Color color { get; set; }
public Category category { get; set; }
public List<Attributes> attributes { get; set; }
}
public class Attributes
{
public List<Attribute> attribute { get; set; }
}
public class Attribute
{
public string name { get; set; }
public string value { get; set; }
}
now my question is I want to add values to List.But facing some problem in adding values to attribute.
I have tried the following,
List<Product> products = new List<Product>();
products = (from inventory in inventoryDetails.AsEnumerable()
select new Product
{
ean = !string.IsNullOrEmpty(inventory.ean) ? inventory.ean : null,
sku = !string.IsNullOrEmpty(inventory.sku) ? inventory.sku : null,
}).ToList();
How to add attribute values? Can anyone please help?

You have multiple ways to write this
without lambda expression
List<Product> products = (from inventory in inventoryDetails.AsEnumerable()
select new Product
{
ean = !string.IsNullOrEmpty(inventory.ean) ? inventory.ean : null,
sku = !string.IsNullOrEmpty(inventory.sku) ? inventory.sku : null,
attributes = inventory.attributes.Select(x => new Attributes
{
//Set properties
}).ToList()
}).ToList();
With Lambda Expression
List<Product> products = inventoryDetails.Select(inventory => new Product
{
ean = !string.IsNullOrEmpty(inventory.ean) ? inventory.ean : null,
sku = !string.IsNullOrEmpty(inventory.sku) ? inventory.sku : null,
attributes = inventory.attributes
// if you want to set properties uncomment below lines and comment above line
//attributes = inventory.attributes.Select(y => new Attributes
//{
////Set properties
//}).ToList()
}).ToList();

You didn't share about inventoryDetails but you could apply select for also attributes;
products = (from inventory in inventoryDetails.AsEnumerable()
select new Product
{
ean = !string.IsNullOrEmpty(inventory.ean) ? inventory.ean : null,
sku = !string.IsNullOrEmpty(inventory.sku) ? inventory.sku : null,
attributes = inventory.attributes.Select(x => new Attributes
{
//Set properties
})
}).ToList();

When a model class cantains a List or collection fields we must intiate them at class constructor like this
public class Product
{
public Product()
{
this.attributes = new List<Attributes>();
}
public string sku { get; set; }
public string ean { get; set; }
public string price { get; set; }
public string description { get; set; }
public string long_description { get; set; }
public string img_url { get; set; }
public Size size { get; set; }
public Style style { get; set; }
public Brand brand { get; set; }
public Color color { get; set; }
public Category category { get; set; }
public List<Attributes> attributes { get; set; }
}
If any case Attribues model is mapped to database then use Icollection instead of List
public Product()
{
this.attributes = new ICollection<Attributes>();
}

Duplicating C# ASP.net object recursively with child & parent nodes

I am trying to create an endpoint to take the ID of the "manualMaster" and duplicate it & all of its children which reside inside of a tree like structure, each node has a parent which are all tied to the main parent being the ManualMaster.
Below are the models used
public class ManualStep
{
public int Id { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Directions { get; set; }
public int MasterId { get; set; }
public ManualMaster Master { get; set; }
public int Index { get; set; } // This property governs where inside of the manual master this step belongs
public virtual ICollection<Image> Images { get; set; } // Virtual because I think I'd always like to have the attached image objects.
public DateTime Created { get; set; }
public DateTime LastModified { get; set; }
//Begin tree storage scheme
public int? ParentId { get; set; }
public ManualStep Parent { get; set; }
public ICollection<ManualStep> Nodes { get; set; }
}
public class ManualMaster
{
public int Id { get; set; }
public string Name { get; set; }
public int BrandId { get; set; }
public Brand Brand { get; set; }
public string Comment { get; set; }
public ICollection<ManualStep> Steps { get; set; }
public DateTime Created { get; set; }
public DateTime LastModified { get; set; }
}
And then the endpoint which takes the ID and attempts to duplicate.
// GET/DUPLICATE: api/Manual/5
[Route("{id}")]
[HttpGet]
[ResponseType(typeof(ManualMaster))]
public async Task<IHttpActionResult> DuplicateManualMaster(int id)
{
ManualMaster manualMaster = await db.ManualMasters
.Include(i => i.Steps)
.FirstOrDefaultAsync(i => i.Id == id);
//
if (manualMaster == null)
{
return NotFound();
}
var dup = new ManualMaster
{
Brand = db.Brands.FirstOrDefault(i => i.Id == manualMaster.BrandId),
BrandId = manualMaster.BrandId,
//manualMaster.Id,
Name = manualMaster.Name,
Comment = manualMaster.Comment
};
foreach (var step in manualMaster.Steps)
{
var newStep = step;
newStep.Parent.Id = dup.Id;
db.ManualSteps.Add(newStep);
await db.SaveChangesAsync();
}
db.ManualMasters.Add(dup);
await db.SaveChangesAsync();
return Ok(dup);
}
My problem is that currently when duplicating, I am setting the id of every node to the main parent ID and not to their respective ID's which create the tree structure.
newStep.Parent.Id = dup.Id;
So instead of copying the entire tree all of my nodes have the same ID... Instead I need to copy the tree structure how it currently is...

Fill the IList Collection using Entity Framework

Below is the Entity class
public partial class TestPlanViewModel
{
public TestPlanViewModel()
{
this.TestPlanTestPoints = new List<TestPlanTestPoint>();
}
public int TestPlanId { get; set; }
public string TestPlanName { get; set; }
public virtual IList<TestPlanTestPoint> TestPlanTestPoints { get; set; }
}
public class TestPlanTestPoint
{
public int OrganizationId { get; set; }
public int TestPlanId { get; set; }
public string TestPlanName { get; set; }
public int TestPlanVersion { get; set; }
public int TestPointId { get; set; }
public string TestPointName { get; set; }
}
I need to write a query where I need to get the collections from the dbContext like,
var query = (from tpm in TestPlanMaster
join tptp in TestPlanTestPoint on tpm.TestPlanId equals tptp.TestPlanId
join tmm in TestMethodMaster on tptp.TestMethodId equals tmm.TestMethodId
join tpma in TestPointMaster on tptp.TestPointId equals tpma.TestPointId
select new
{
//Plan Details
tpm.TestPlanId,
tpm.TestPlanName,
}).ToList().Select(x => new Entities.CustomEntities.TestPlanViewModel ====> Custom Entity
{
TestPlanId = x.TestPlanId,
TestPlanName = x.TestPlanName,
TestPlanTestPoints = ?????? ==> how to fill this collection
});
As shown above the TestPlanTestPoints is the IList collection object. I need to populate the data with the values from TestPlanTestPoint table.
Any suggestions?
Model
TestPlan
public partial class TestPlanMaster
{
[DataMember]
public int TestPlanId { get; set; }
[DataMember]
public short TestPlanVersion { get; set; }
[DataMember]
public int OrganizationId { get; set; }
[DataMember]
public short TestPlanTypeId { get; set; }
[DataMember]
public string TestPlanName { get; set; }
}
TestPlanTestPointMapping Model
public partial class TestPlanTestPointMapping
{
[DataMember]
public int OrganizationId { get; set; }
[DataMember]
public int TestPlanId { get; set; }
[DataMember]
public short TestPlanVersion { get; set; }
[DataMember]
public int TestPointId { get; set; }
}

You are thinking too much sql, think more linq. You want to select "tpm" items, so just write a select of those and select the new TestPlanViewModel and fill its properties and navigational properties.
I'm assuming you have a TestPlanTestPoints navigational property in your TestPlanMaster.
var q = (from tpm in TestPlanMaster
select new TestPlanViewModel
{
TestPlanId = tpm.TestPlanId,
TestPlanName = tpm.TestPlanName,
TestPlanPoints = TestPlanTestPoint.Where(pr => tpm.TestPlanId == pr.TestPlanId).Select(tptp => new TestPlanTestPoint()
{
// Fill properties here
}
}).ToList();

How to use Multi-Mapper to create multiple one to many object hierarchy

I have my 2 models like below
public class FItem
{
public FItem() { }
public int RecordId { get; set; }
public int MarketId { get; set; }
public string ItemName { get; set; }
public string ItemFamily { get; set; }
public string HoverFamily { get; set; }
public string ItemDesc { get; set; }
public IEnumerable<FSubsystem> FSubsystems { get; set; }
}
public class FSubsystem
{
public FSubsystem() { }
public int FSubsystemId { get; set; }
public int RecordId { get; set; } //Foreign key
public int supplierId { get; set; }
public int SubSystemTypeId { get; set; }
public double Percentage { get; set; }
public double? Value { get; set; }
}
public class FReferences
{
public FReferences() { }
public int RecordID { get; set; } //Foreign key
public int SourceID { get; set; }
public DateTime SourceDate { get; set; }
public string Reference { get; set; }
public int? ReferenceID { get; set; }
}
and I use dapper to fetch the data and put into objects . code is as belolw
using (var multi = mapperConnection.QueryMultiple("USP_FetchMarketRecords", parameters, (SqlTransaction)null, 1000000, CommandType.StoredProcedure))
{
IEnumerable<MarketRecord.FItem> FItem = multi.Read<MarketRecord.FItem>().ToList();
IEnumerable<MarketRecord.FSubsystem> FSubsystem = multi.Read<MarketRecord.FSubsystem>().ToList();
}
Now I want to get the subsystems for each record id and put them in FSubsystems property of Fitem . How can I do this ?
Here I am showing only one one to many relationship to FItem thats Fsubsystem . But I have many one to many tables to Fitem like FReferenc ,FUnit etc . For all foreign key is RecordId itelf.
Can this be done through linq query ? or should I use some diff technique ?

Dapper doesn't include anything built in to reconstruct parent/child relationships from different sets.
You can probably generalize the scenario something like:
static void ApplyParentChild<TParent, TChild, TId>(
this IEnumerable<TParent> parents, IEnumerable<TChild> children,
Func<TParent, TId> id, Func<TChild, TId> parentId,
Action<TParent, TChild> action)
{
var lookup = parents.ToDictionary(id);
foreach (var child in children)
{
TParent parent;
if (lookup.TryGetValue(parentId(child), out parent))
action(parent, child);
}
}
so if we had:
List<Parent> parents = new List<Parent> {
new Parent { Id = 1 },
new Parent { Id = 2 }
};
List<Child> children = new List<Child> {
new Child { Id = 3, ParentId = 1},
new Child { Id = 4, ParentId = 2},
new Child { Id = 5, ParentId = 1}
};
You could use:
parents.ApplyParentChild(children, p => p.Id, c => c.ParentId,
(p,c) => p.Children.Add(c));