Delphi - dynamically add all fields at runtime generate duplicates in dataset

Based on How to add a field programatically to a TAdoTable in Delphi I am trying to add all the fields dynamically to a FibPlus dataset (could be any TDataSet descendant). Each field is declared as a variable. Declarations part

  TForm4 = class(TForm)
    pFIBDatabase1: TpFIBDatabase;
    pFIBTransaction1: TpFIBTransaction;
    ds1: TpFIBDataSet;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    procedure FormCreate(Sender: TObject);
    { Private declarations }
   iVERField : TFIBIntegerField;//I need that all fields to be represented by a variable
    { Public declarations }

and on the formcreate event, I create all the fields, set the needed properties and add dynamically all of them to the my dataset.

procedure TForm4.FormCreate(Sender: TObject);
var i:Integer;
    fieldDef :TFieldDef;
 ds1.SQLs.SelectSQL.Text := 'select ver from ver';


 iVERField := TFIBIntegerField.Create(ds1);
 iVERField.FieldName := 'VER';
 iVERField.DisplayLabel := 'VER';
 iVERField.Name := 'iVERField';
 iVERField.DataSet := ds1;


My problem is that the field appear as a duplicate on a dbgrid

LE: Why field appears twice:

 iVERField.DataSet := ds1; //one 

LE1: Is this the way I should add all the fields as variables to the dataset?


In D7 (and I doubt it's changed since), TField's SetDataSet method already calls the Ffields.Add method of the dataset, so your explicit ds1.Fields.Add adds it a second time, hence the duplicated field.

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