added new :DATASET pv to capture records

src/pandablocks_ioc/_pvi.py

@@ -164,7 +164,7 @@ def add_automatic_pvi_info(
 _positions_table_group = Group(
     name="PositionsTable", layout=Grid(labelled=True), children=[]
 )
-_positions_table_headers = ["VALUE", "UNITS", "SCALE", "OFFSET", "CAPTURE"]
+_positions_table_headers = ["VALUE", "UNITS", "SCALE", "OFFSET", "DATASET", "CAPTURE"]
 
 
 # TODO: Replicate this for the BITS table
@@ -174,6 +174,7 @@ def add_positions_table_row(
     units_record_name: EpicsName,
     scale_record_name: EpicsName,
     offset_record_name: EpicsName,
+    dataset_record_name: EpicsName,
     capture_record_name: EpicsName,
 ) -> None:
     """Add a Row to the Positions table"""
@@ -205,6 +206,12 @@ def add_positions_table_row(
             pv=offset_record_name,
             widget=TextWrite(),
         ),
+        SignalRW(
+            name=epics_to_pvi_name(dataset_record_name),
+            label=dataset_record_name,
+            pv=dataset_record_name,
+            widget=TextWrite(),
+        ),
         SignalRW(
             name=epics_to_pvi_name(capture_record_name),
             label=capture_record_name,

src/pandablocks_ioc/ioc.py

@@ -917,6 +917,16 @@ def _make_pos_out(
             DESC="Value with scaling applied",
         )
 
+        dataset_record_name = EpicsName(record_name + ":DATASET")
+        record_dict[dataset_record_name] = self._create_record_info(
+            dataset_record_name,
+            "Used to adjust the dataset name to one more scientifically relevant",
+            builder.stringOut,
+            str,
+            PviGroup.CAPTURE,
+            initial_value=values.get(dataset_record_name, ""),
+        )
+
         # Create the POSITIONS "table" of records. Most are aliases of the records
         # created above.
         positions_record_name = f"POSITIONS:{self._pos_out_row_counter}"
@@ -957,6 +967,13 @@ def _make_pos_out(
             + ":"
             + units_record_name.split(":")[-1]
         )
+        record_dict[dataset_record_name].record.add_alias(
+            self._record_prefix
+            + ":"
+            + positions_record_name
+            + ":"
+            + dataset_record_name.split(":")[-1]
+        )
 
         self._pos_out_row_counter += 1
         add_positions_table_row(
@@ -965,6 +982,7 @@ def _make_pos_out(
             units_record_name,
             scale_record_name,
             offset_record_name,
+            dataset_record_name,
             capture_record_name,
         )