小编Aba*_*ous的帖子

我被这个查询困住了，甚至不确定我应该通过谷歌搜索什么来找到解决方案，在这个查询中，我正在寻找附加到特定帐户的客户，但如果客户的状态为“避免”或“阻止”，则查询应返回空结果。如果没有“$nin”表达式，此查询工作正常，但在输入 $nin 后，出现错误：

{ $lookup : {
        from     : 'client' ,
        let      : { id: '$client_id' },
        pipeline : [{
            $match : {
              $expr : {
                $and : [
                  { $eq   : ['$client_id', this.ObjectID(meta.query._id)] },
                  { $eq   : ['$account_id', '$$id'] },
                  { $nin  : ['$status' , 'deny' , 'blocked']}
              ]
       }
}

UnhandledPromiseRejectionWarning: MongoError: Unrecognized expression '$nin'

我有一个堆栈导航，我想在 android 和 IOS 上启用滑动返回，这是我的代码

import {
  createStackNavigator,
  StackViewTransitionConfigs,
} from "react-navigation-stack";
import HomeScreen from "../../screens/Home/Home";
import CategoryScreen from "../../screens/Category/Category";
import SubCategoryScreen from "../../screens/SubCategory/SubCategory";
import ProductScreen from "../../screens/Product/Product";

const ShopStack = createStackNavigator(
  {
    Shop: {
      screen: HomeScreen,
      navigationOptions: {
        gesturesEnabled: true,
      },
    },
    Category: {
      screen: CategoryScreen,
      navigationOptions: {
        gesturesEnabled: true,
      },
    },
    SubCategory: {
      screen: SubCategoryScreen,
    },
    Product: {
      screen: ProductScreen,
      navigationOptions: {
        gesturesEnabled: true,
      },
    },
  },
  {
    headerMode: "none",
    transitionConfig: () => StackViewTransitionConfigs.SlideFromRightIOS,

    defaultNavigationOptions: {
      gesturesEnabled: true, …