ENH: validate inplace volumes with Pydantic

src/fmu/dataio/export/rms/inplace_volumes.py

@@ -11,6 +11,7 @@
 import fmu.dataio as dio
 from fmu.dataio._logging import null_logger
 from fmu.dataio._model.enums import Classification
+from fmu.dataio._products.inplace_volumes import InplaceVolumesResult
 from fmu.dataio.export import _enums
 from fmu.dataio.export._decorators import experimental
 from fmu.dataio.export._export_result import ExportResult, ExportResultItem
@@ -171,7 +172,7 @@ def _transform_and_add_fluid_column_to_table(
                 )
 
                 # add the fluid as column entry instead
-                fluid_table[_enums.InplaceVolumes.FLUID_COLUMN] = fluid
+                fluid_table[_enums.InplaceVolumes.FLUID_COLUMN.value] = fluid
 
                 tables.append(fluid_table)
 
@@ -203,8 +204,12 @@ def _validate_table(self) -> None:
         """
         _logger.debug("Validating the dataframe...")
 
-        has_oil = "oil" in self._dataframe[_enums.InplaceVolumes.FLUID_COLUMN].values
-        has_gas = "gas" in self._dataframe[_enums.InplaceVolumes.FLUID_COLUMN].values
+        has_oil = (
+            "oil" in self._dataframe[_enums.InplaceVolumes.FLUID_COLUMN.value].values
+        )
+        has_gas = (
+            "gas" in self._dataframe[_enums.InplaceVolumes.FLUID_COLUMN.value].values
+        )
 
         # check that one of oil and gas fluids are present
         if not (has_oil or has_gas):
@@ -233,6 +238,9 @@ def _validate_table(self) -> None:
                 "rerun the volumetric job before export."
             )
 
+        df = self._dataframe.replace(np.nan, None).to_dict(orient="records")
+        InplaceVolumesResult.model_validate(df)
+
     def _export_volume_table(self) -> ExportResult:
         """Do the actual volume table export using dataio setup."""
 

tests/test_export_rms/test_export_rms_volumetrics.py

@@ -7,6 +7,7 @@
 import numpy as np
 import pandas as pd
 import pytest
+from pydantic import ValidationError
 
 import fmu.dataio as dataio
 from fmu.dataio._logging import null_logger
@@ -262,6 +263,22 @@ def test_validate_table_has_gas_and_giip(exportvolumetrics, voltable_standard):
     exportvolumetrics._validate_table()
 
 
+def test_validate_table_against_pydantic_model_before_export(
+    exportvolumetrics, voltable_standard
+):
+    """Test that the validation fails if the volumes table does not conform to the
+    Pydantic model specifying the result."""
+
+    df = voltable_standard.copy()
+    exportvolumetrics._dataframe = df
+    exportvolumetrics._validate_table()
+
+    df["PORV"] = df["PORV"].replace(0.0, "a")
+    exportvolumetrics._dataframe = df
+    with pytest.raises(ValidationError, match="Input should be a valid number"):
+        exportvolumetrics._validate_table()
+
+
 @inside_rms
 def test_rms_volumetrics_export_config_missing(
     mock_project_variable,