fix(client): fix the issue where setting default values using variabl… (#4521)

* fix(client): fix the issue where setting default values using variables in the sub-table is not work

* test: add unit tests

packages/core/client/src/schema-component/antd/form-item/__tests__/hooks/useSpecialCase.test.ts

@@ -7,7 +7,8 @@
  * For more information, please refer to: https://www.nocobase.com/agreement.
  */
 
-import { transformValue } from '../../hooks/useSpecialCase';
+import { vi } from 'vitest';
+import { isSpecialCaseField, transformValue } from '../../hooks/useSpecialCase';
 
 describe('transformValue', () => {
   it('value is an array', () => {
@@ -40,3 +41,90 @@ describe('transformValue', () => {
     `);
   });
 });
+
+describe('isSpecialCaseField', () => {
+  it('should return false for field with default value including "$iteration"', () => {
+    const collectionField = {
+      type: 'hasOne',
+    };
+    const parentFieldSchema = {
+      'x-collection-field': 'parentField',
+      'x-component-props': {
+        mode: 'SubTable',
+      },
+    };
+    const fieldSchema: any = {
+      default: '{{ $iteration.name }}',
+      parent: parentFieldSchema,
+    };
+
+    const getCollectionField = vi.fn().mockReturnValue({
+      type: 'hasMany',
+    });
+
+    const result = isSpecialCaseField({ collectionField, fieldSchema, getCollectionField });
+
+    expect(result).toBe(false);
+  });
+
+  it('should return false for field with collectionField type "hasOne" or "belongsTo" and no parent field with type "hasMany" or "belongsToMany"', () => {
+    const collectionField = {
+      type: 'hasOne',
+    };
+    const fieldSchema: any = {
+      default: '',
+    };
+    const getCollectionField = vi.fn().mockReturnValue(null);
+
+    const result = isSpecialCaseField({ collectionField, fieldSchema, getCollectionField });
+
+    expect(result).toBe(false);
+  });
+
+  it('should return true for field with collectionField type "hasOne" or "belongsTo" and parent field with type "hasMany"', () => {
+    const collectionField = {
+      type: 'hasOne',
+    };
+    const parentFieldSchema = {
+      'x-collection-field': 'parentField',
+      'x-component-props': {
+        mode: 'SubTable',
+      },
+    };
+    const fieldSchema: any = {
+      default: '',
+      parent: parentFieldSchema,
+    };
+
+    const getCollectionField = vi.fn().mockReturnValue({
+      type: 'hasMany',
+    });
+
+    const result = isSpecialCaseField({ collectionField, fieldSchema, getCollectionField });
+
+    expect(result).toBe(true);
+  });
+
+  it('should return true for field with collectionField type "hasOne" or "belongsTo" and parent field with type "belongsToMany"', () => {
+    const collectionField = {
+      type: 'hasOne',
+    };
+    const parentFieldSchema = {
+      'x-collection-field': 'parentField',
+      'x-component-props': {
+        mode: 'SubTable',
+      },
+    };
+    const fieldSchema: any = {
+      default: '',
+      parent: parentFieldSchema,
+    };
+    const getCollectionField = vi.fn().mockReturnValue({
+      type: 'belongsToMany',
+    });
+
+    const result = isSpecialCaseField({ collectionField, fieldSchema, getCollectionField });
+
+    expect(result).toBe(true);
+  });
+});

packages/core/client/src/schema-component/antd/form-item/hooks/useSpecialCase.ts

@@ -13,11 +13,11 @@ import _ from 'lodash';
 import { useCallback, useEffect, useMemo } from 'react';
 import {
   CollectionFieldOptions_deprecated,
-  useCollection_deprecated,
   useCollectionManager_deprecated,
+  useCollection_deprecated,
 } from '../../../../collection-manager';
-import { isSubMode } from '../../association-field/util';
 import { markRecordAsNew } from '../../../../data-source/collection-record/isNewRecord';
+import { isSubMode } from '../../association-field/util';
 
 /**
  * #### 处理 `子表单` 和 `子表格` 中的特殊情况
@@ -92,6 +92,11 @@ export function isSpecialCaseField({
   fieldSchema: Schema;
   getCollectionField: (name: string) => CollectionFieldOptions_deprecated;
 }) {
+  // 排除掉“当前对象”这个变量
+  if (fieldSchema.default.includes('$iteration')) {
+    return false;
+  }
+
   if (collectionField && ['hasOne', 'belongsTo'].includes(collectionField.type) && fieldSchema) {
     const parentFieldSchema = getParentFieldSchema(fieldSchema);
     if (parentFieldSchema && parentFieldSchema['x-collection-field']) {