Can you use string functions in a PXSelector?

@Shawn Burt , I changed the code a bit.  I actually want the first 7 chars of the acctCD.  It still give the error but just fyi.

DescriptionField = typeof(Substring<BAccount2.acctCD, int1, ICSInt7>))]

Didn’t help.  Nice try!  :-)  

Hi @Leonardo Justiniano 

Thanks for taking the time to put that code together for me!

The code compiles nicely.

Even if I don’t use the DescriptionField = typeof(BAccountExt.usrDescriptionPrefix) in the selector, the page errors out.

This is the error I am getting

Error: The first type has to be convertible to the Bqlcommand type.
Parameter name: types

This is the BAccount extension.  Maybe it is a simple fix.  I don’t see anything wrong with this.

    public class BAccountExt : PXCacheExtension<PX.Objects.CR.BAccount2>
    {
        #region Description
        public abstract class usrDescriptionPrefix : PX.Data.BQL.BqlString.Field<usrDescriptionPrefix> { }
        protected string _UsrDescriptionPrefix;

        ePXDBLocalizableString(250, IsUnicode = true)]
        (PXDefault()]
         PXUIField(DisplayName = "Description", Visibility = PXUIVisibility.SelectorVisible, IsReadOnly = true)]
        SPXDBScalar(typeof(BAccount2.acctCD))]
        public virtual string UsrDescriptionPrefix
        {
            get
            {
                try
                {
                    return this._UsrDescriptionPrefix.Substring(0, _UsrDescriptionPrefix.IndexOf('-'));
                }
                catch
                {
                    return "";
                }
            }
            set
            {
                this._UsrDescriptionPrefix = value;
            }
        }
        #endregion
    }

Maybe someone has seen that error and knows exactly what to look for.  My noobishness says it looks fine.  :-)

@joe21 try the below 

      #region Description
        public abstract class usrDescriptionPrefix : PX.Data.BQL.BqlString.Field<usrDescriptionPrefix> { }
        protected string _UsrDescriptionPrefix;

        fPXDBLocalizableString(250, IsUnicode = true)]
        dPXUIField(DisplayName = "Description", Visibility = PXUIVisibility.SelectorVisible)]
        public virtual string UsrDescriptionPrefix
        {
            get
            {
                try
                {
                    return this._Description.Substring(0, _Description.IndexOf('-'));
                }
                catch
                {
                    return "";
                }
            }
            set
            {
                this._UsrDescriptionPrefix = value;
            }
        }
        #endregion

@aaghaei 

That compiles and does not cause any errors when I open the screen.

When I try to create a timecard entry, I get this error:

Did I do something wrong in my implementation of this DAC field?

        #region UsrCustomerID
        �PXDBInt]
                mPXSelector(typeof(SearchFor<BAccount2.bAccountID>.
            Where<BAccount2.type.IsEqual<ICSCustomerType>.
            And<BAccount2.parentBAccountID.IsNotNull>>),
                typeof(BAccount2.acctCD),
                typeof(BAccountCRM.acctName),
                SubstituteKey = typeof(BAccount2.acctCD),
                DescriptionField = typeof(BAccountExt.usrDescriptionPrefix))]
         PXRestrictor(typeof(Where<BAccount2.parentBAccountID, IsNotNull>), ICSMessages.ParentAccount)]
        public virtual int? UsrCustomerID { get; set; }
        public abstract class usrCustomerID : PX.Data.BQL.BqlInt.Field<usrCustomerID> { }
        #endregion

I was thinking maybe the entire DAC field needs to use the BAccountExt but that does not compile.

Hi @Leonardo Justiniano 

The code is firing and not causing any errors, which is great!

However, this line always returns null

return this._UsrDescriptionPrefix.Substring(0, _UsrDescriptionPrefix.IndexOf('-'));

so the Description field in the Lookup is empty as it hits the catch block.

Please don’t spend more time on this.  The customer can live with the field showing the full customer CD.

I thank you all for your efforts!

Hi @joe21 

Make sure you did not remove

set
{
      this._UsrDescriptionPrefix = value;
}

pPXDBScalar] requires it to be able to assign the value to the protected attribute.

Hi @Leonardo Justiniano 

When I put in PXDBScalar, I get an error on the page:

Error: The first type has to be convertible to the Bqlcommand type.
Parameter name: types

If I remove that line, the code runs, but always returns an empty string.

This is what my code looks like at this point:

    public class BAccountExt : PXCacheExtension<PX.Objects.CR.BAccount2>
    {
        #region Description
        public abstract class usrDescriptionPrefix : PX.Data.BQL.BqlString.Field<usrDescriptionPrefix> { }
        protected string _UsrDescriptionPrefix;
        rPXString(250)]
        �PXUIField(DisplayName = "Description", Visibility = PXUIVisibility.SelectorVisible)]
        sPXDBScalar(typeof(BAccount2.acctCD))]
        public virtual string UsrDescriptionPrefix
        {
            get
            {
                try
                {
                    return this._UsrDescriptionPrefix.Substring(0, _UsrDescriptionPrefix.IndexOf('-'));
                }
                catch
                {
                    return "";
                }
            }
            set
            {
                this._UsrDescriptionPrefix = value;
            }
        }
        #endregion
    }
 

@joe21 

I am so curious myself to see what happens here. Can you please direct me to the screen you are trying to customize and share the piece of the code related to this issue (DAC and Graph if there is any)?

@joe21 I put that request on you. Is your screen a custom one or an extension of an existing one? I want to test the code accordingly. My draft is based on the Customer screen.