Child DAC are not inserting when add a new Item - acumatica

Question

I have 2 scenarios, I am facing issue.
I have 3 DAC, One is Parent and other 2 are child DAC.
I have tab view, and showing data accordingly.
First tab showing Parent DAC data.
Second and third are showing child DAC data.
I am creating new item, Now i press Add(+) button and fill, Information in Parent tab, but not filled any data in 2nd and 3rd tab, when i press SAVE then only parent DAC saved, 2nd and 3rd tab rows not created in database, I want to save 2nd and 3rd Tab DAC also, what should i do?
Another case:
i am not allowing DAC to update, I am setting DAC.Cahce.AllowUpdated = false; all controls are disabled excepting Checkbox, why?
Also when we are on 3rd tab and click on toolbar Navigation button, then 1st tab data doesn't refresh, it is showing previous selected item data. How to fix this issue?
We are not using PXGrid for any child data, there is one to one relation ship between all 3 DAC.
/// Parent View
public SelectFrom<Parent>.View parentTran;
/// Child view
public SelectFrom<Child> .Where<Child.tranId.IsEqual<Parent.nCTranId.AsOptional>>.View
childAnalysis;
#region TranId
// Child DAC Field.
public abstract class tranId:PX.Data.BQL.BqlInt.Field<tranId> {
}
[PXDBInt(IsKey = true)]
[PXDBDefault(typeof(Parent.nCTranId))]
[PXParent(typeof(Select<Parent, Where<Parent.nCTranId, Equal<Current<tranId>>>>))]
public virtual int? TranId {
get; set;
}
#endregion

Answer 1

Take a look at T210 regarding Master-Detail Relationships. It contains a section on inserting a default record, which sounds like what you are trying to do with your child DAC. The training can be found at https://openuni.acumatica.com/courses/development/t210-development-customized-forms-and-master-detail-relationship/ on the Acumatica website. Specifically look at pages 103 and 104.
In step 3 of the section, you will see use of the RowInserted event to insert the child record. Since the RowInserted event fires only when creating a record, making it safe to insert the child record.
See the following code sample. I tried to use as much of your sample as possible, but I merged it with the technique shown in the training guide. Disclaimer: It will compile, but I have not built the prerequisites to fully test the code.
using PX.Data;
using PX.Data.BQL.Fluent;
namespace SSCS.CodeSample
{
public class CodeSampleEntry : PXGraph<CodeSampleEntry, DACParent>
{
#region Data Views
/// Parent View
[PXViewName("Parent View - Primary")]
public SelectFrom<DACParent>.View ParentTran;
/// Child view
[PXViewName("Child View")]
public SelectFrom<DACChild>
.Where<DACChild.tranId.IsEqual<DACParent.nCTranId.FromCurrent>>
.View ChildAnalysis;
#endregion
// RowInserted Event to Create a Default Child Record
// See T210 Master-Detail training guide from Acumatica
protected virtual void _(Events.RowInserted<DACParent> e)
{
// Ensure there isn't a child record already
if (ChildAnalysis.Select().Count == 0)
{
// Save state of IsDirty so that we can restore it
// after inserting the default child record
// so that we don't force the user to save
// unless they actually enter data somewhere
bool oldDirty = ChildAnalysis.Cache.IsDirty;
// Create an object for the child
// and fill in any data that should be
// populated by default
DACChild newChild = new DACChild();
newChild.MyData = "My Value";
// Insert the new child record into the cache
ChildAnalysis.Insert(newChild);
// Restore the IsDirty flag
// The insert above will have marked the view as
// dirty. If it wasn't dirty before, it should be
// treated as if it still isn't
ChildAnalysis.Cache.IsDirty = oldDirty;
}
}
}
[PXCacheName("Parent DAC")]
public class DACParent : IBqlTable
{
#region NCTranId
[PXDBIdentity]
public virtual int? NCTranId { get; set; }
public abstract class nCTranId
: PX.Data.BQL.BqlInt.Field<nCTranId> { }
#endregion
}
[PXCacheName("Child DAC")]
public class DACChild : IBqlTable
{
#region TranId
[PXDBInt(IsKey = true)]
[PXDBDefault(typeof(DACParent.nCTranId))]
[PXParent(typeof(SelectFrom<DACParent>
.Where<DACParent.nCTranId.IsEqual<DACChild.tranId.FromCurrent>>))]
public virtual int? TranId { get; set; }
public abstract class tranId
: PX.Data.BQL.BqlInt.Field<tranId> { }
#endregion
#region MyData
[PXDBString()]
[PXUIField(DisplayName = "My Data Field")]
public virtual string MyData { get; set; }
public abstract class myData
: PX.Data.BQL.BqlString.Field<myData> { }
#endregion
}
}