修改物料详情中的中小类的bug

src/views/MaterialDetail.vue

@@ -46,7 +46,7 @@
                     <el-form-item label="小类">
                         <my-select
                             v-model="query.smallCategoryId"
-                            :options="middleCategories"
+                            :options="smallCategories"
                         >
                         <el-option label="全部" value=""></el-option>
                         </my-select>
@@ -200,7 +200,7 @@ export default {
 
     onChangeMiddleCategoryBtnClick (id) {
       this.$$request(materialCategoryApi.getList, {parentId: id}).then(dataList => {
-        this.middleCategories = Object.freeze(dataList)
+        this.smallCategories = Object.freeze(dataList)
       }).catch(console.error)
     },
     onOpenDetailEditorBtnClick (data) {