您阅读的所有聊天的第一个首选ID。

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyForm extends StatefulWidget {
  @override
  State createState() {
    return _MyFormState();
  }
}

class _MyFormState extends State<MyForm> {
  static final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  final Map<int,String> model = Map<int,String>();

  @override
  void initState() {
    print('initState()');
    for (int i = 0; i < 20; i++) {
      model[i] = null;
    }
    super.initState();
  }

  String validate(String value) {
    return value.isEmpty ? 'Cannot be blank!' : null;
  }

  void submitForm() {
    final FormState formState = _formKey.currentState;

    if (formState.validate()) {
      print('form is valid');
      formState.save();
    } else {
      print('form is invalid');
    }
  }

  @override
  Widget build(BuildContext context) {
    List<Widget> fields = [];

    for (int i = 0; i < 20; i++) {
      Widget widget = TextFormField(
        initialValue: model[i],decoration: InputDecoration(
          labelText: 'field $i',),validator: validate,onFieldSubmitted: (String value) {
          print('field $i onFieldSubmitted()');
          setState(() {
            model[i] = value;
          });
        },onChanged: (String value) {
          print('field $i onChanged()');
          setState(() {
            model[i] = value;
          });
        },onSaved: (String value) {
          print('field $i onSaved()');
          setState(() {
            model[i] = value;
          });
        },);
      fields.add(widget);
    }

    fields.add(RaisedButton(
      child: Text('save'),onPressed: submitForm,));

    return Form(
      key: _formKey,child: ListView(
        children: fields,);
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',theme: ThemeData(
        primarySwatch: Colors.blue,home: Scaffold(
        appBar: AppBar(
          title: Text('form test'),body: MyForm(),);
  }
}

然后申请

$pluckedId=Chat::has('messages.reads',function (Builder $q) {
            return $q->where('user_id',auth()->id());
        })->pluck('id');

好吧，我终于找到了一种方法，该方法仅提取聊天的最后一条消息，并使用查询生成器方法检查特定用户是否已阅读了该消息。

在这里，我使用子查询发布魔法范围；）

public function scopeUnreadBy(Builder $builder,int $userId)
{
    //First,look for Chats with Messages
    return $builder->whereHas('messages',function (Builder $q) use ($userId) { 
        $q->select(['last_message' => function(\Illuminate\Database\Query\Builder $sub) {
            // Then,take only last one Message
            $sub->select('id')
                ->from('messages')
                ->where('chat_id','chats.id')
                ->latest()
                ->limit(1);
        }])->whereDoesntHave('reads',function(Builder $q) use ($userId) {
            // Finally,check that last one has not been read :D
            return $q->where('user_id',$userId);
        });
    });
}

Ph，那很难。

我希望它对其他人有帮助！

请记住，所有这些都可以通过一个查询完成；）