fix:crud filter combo模式不能清空查询条件 (#1990)

Co-authored-by: dqc <qianchuan.deng@gmail.com>

src/renderers/CRUD.tsx

@@ -784,8 +784,18 @@ export default class CRUD extends React.Component<CRUDProps, any> {
       perPageField,
       loadDataOnceFetchOnFilter
     } = this.props;
-    values = syncLocation ? qs.parse(qsstringify(values)) : values;
-
+    values = syncLocation
+      ? qs.parse(
+          qsstringify(
+            values,
+            {
+              arrayFormat: 'indices',
+              encodeValuesOnly: true
+            },
+            true
+          )
+        )
+      : values;
     store.updateQuery(
       {
         ...values,

src/utils/helper.ts

@@ -1282,8 +1282,14 @@ export function qsstringify(
   options: any = {
     arrayFormat: 'indices',
     encodeValuesOnly: true
-  }
+  },
+  keepEmptyArray?: boolean
 ) {
+  // qs会保留空字符串。fix: Combo模式的空数组，无法清空。改为存为空字符串；只转换一层
+  keepEmptyArray &&
+    Object.keys(data).forEach((key: any) => {
+      Array.isArray(data[key]) && !data[key].length && (data[key] = '');
+    });
   return qs.stringify(data, options);
 }