Handle relations for filters (#13654)

- Refacto variable dropdown so it can display both objects and fields
- we do not filter on object name anymore to simplify the code
- add relation handler in filters



https://github.com/user-attachments/assets/e4f03f11-45cb-4d3f-b628-e996129dd996

packages/twenty-front/src/modules/workflow/workflow-steps/workflow-actions/filter-action/components/WorkflowStepFilterFieldSelect.tsx

@@ -24,6 +24,8 @@ export const WorkflowStepFilterFieldSelect = ({
   stepFilter,
 }: WorkflowStepFilterFieldSelectProps) => {
   const { readonly } = useContext(WorkflowStepFilterContext);
+  const shouldDisplayRecordFields = true;
+  const shouldDisplayRecordObjects = true;
 
   const { upsertStepFilterSettings } = useUpsertStepFilterSettings();
 
@@ -44,9 +46,10 @@ export const WorkflowStepFilterFieldSelect = ({
 
   const { getFieldMetadataItemById } = useGetFieldMetadataItemById();
 
-  const availableVariablesInWorkflowStep = useAvailableVariablesInWorkflowStep(
-    {},
-  );
+  const availableVariablesInWorkflowStep = useAvailableVariablesInWorkflowStep({
+    shouldDisplayRecordFields,
+    shouldDisplayRecordObjects,
+  });
 
   const noAvailableVariables = availableVariablesInWorkflowStep.length === 0;
 
@@ -157,6 +160,9 @@ export const WorkflowStepFilterFieldSelect = ({
           textAccent={isSelectedFieldNotFound ? 'placeholder' : 'default'}
         />
       }
+      shouldDisplayRecordFields={shouldDisplayRecordFields}
+      shouldDisplayRecordObjects={shouldDisplayRecordObjects}
+      shouldEnableSelectRelationObject={true}
     />
   );
 };

packages/twenty-front/src/modules/workflow/workflow-steps/workflow-actions/filter-action/components/WorkflowStepFilterValueInput.tsx

@@ -43,6 +43,7 @@ const isFilterableFieldMetadataType = (
     FieldMetadataType.RICH_TEXT_V2,
     FieldMetadataType.ARRAY,
     FieldMetadataType.UUID,
+    FieldMetadataType.RELATION,
     ...COMPOSITE_FIELD_METADATA_TYPES,
   ].includes(type as FieldMetadataType);
 };
@@ -142,6 +143,9 @@ export const WorkflowStepFilterValueInput = ({
     metadata: {
       fieldName: selectedFieldMetadataItem?.name ?? '',
       options: selectedFieldMetadataItem?.options ?? [],
+      relationObjectMetadataNameSingular:
+        selectedFieldMetadataItem?.relation?.targetObjectMetadata?.nameSingular,
+      relationType: selectedFieldMetadataItem?.relation?.type,
     } as FieldMetadata,
   };