fix(plugin-flow-engine): resolve tree targets

packages/plugins/@nocobase/plugin-flow-engine/src/server/__tests__/flow-surfaces.field-binding-registry.unit.test.ts

@@ -333,6 +333,14 @@ describe('flowSurfaces field binding registry', () => {
         template: 'tree',
       },
     };
+    const runtimeTreeToOneField = {
+      interface: 'm2o',
+      targetCollection: () => ({
+        options: {
+          template: 'tree',
+        },
+      }),
+    };
     const generalToOneField = {
       interface: 'm2o',
       targetCollection: {
@@ -369,6 +377,12 @@ describe('flowSurfaces field binding registry', () => {
         field: treeToOneField,
       })?.has('CascadeSelectFieldModel'),
     ).toBe(true);
+    expect(
+      resolveSupportedFieldCapability({
+        containerUse: 'FilterFormBlockModel',
+        field: runtimeTreeToOneField,
+      }).fieldUse,
+    ).toBe('CascadeSelectFieldModel');
 
     expect(
       resolveSupportedFieldCapability({

packages/plugins/@nocobase/plugin-flow-engine/src/server/flow-surfaces/field-binding-registry.ts

@@ -70,13 +70,7 @@ function isNumericFormulaDataType(dataType: any) {
 }
 
 function resolveTargetCollection(input: FlowSurfaceResolvedFieldBindingInput) {
-  if (input.field?.targetCollection) {
-    return input.field.targetCollection;
-  }
-  if (!input.getCollection || !input.dataSourceKey) {
-    return null;
-  }
-  return resolveFieldTargetCollection(input.field, input.dataSourceKey, input.getCollection);
+  return resolveFieldTargetCollection(input.field, input.dataSourceKey || 'main', input.getCollection || (() => null));
 }
 
 function normalizeBindingContainerUse(containerUse?: string) {