如何使用 eloquent 导航到集合中的集合答案

【问题标题】：How to navigate into a collections in collections with eloquent如何使用 eloquent 导航到集合中的集合
【发布时间】：2019-09-28 04:17:15
【问题描述】：

我有一个collection of collection 到一个variable。我尝试将数据管理到此变量中，但它不起作用。

// User.php
public function projects()
 {
        return $this->belongsToMany(Project::class,'time_entries')
                                    ->withPivot('hours');
 }

// Project.php
public function users()
 {
        return $this->belongsToMany(User::class, 'time_entries')
        ->withPivot('hours');
 }

/// TimeEntries.php

public function user() 
 {
        return $this->belongsTo( 'App\Model\User' );
 }

public function project() 
 {
        return $this->belongsTo( 'App\Model\Project','project_id' );
 }

一个用户可以输入很多时间，他可以参与很多项目。项目可以有很多时间条目。

我试试这个：

$users = User::with('projects')->get();
        foreach ($users$users = User::with('projects')->get();
        foreach ($users as $user) {
            foreach($user->projects() as $a) {
                dump ($a);
            }
        }

我得到了

false

$user 的转储：

User {#715 ▼
  #table: "users"
  #connection: "redmine"
  #with: array:1 [▶]
  #fillable: array:19 [▶]
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #withCount: []
  #perPage: 15
  +exists: true
  +wasRecentlyCreated: false
  #attributes: array:19 [▶]
  #original: array:19 [▶]
  #changes: []
  #casts: []
  #dates: []
  #dateFormat: null
  #appends: []
  #dispatchesEvents: []
  #observables: []
  #relations: array:2 [▼
    "projectrecap" => Collection {#714 ▼
      #items: []
    }
    "projects" => Collection {#1414 ▼
      #items: array:11 [▼
        0 => Project {#17329 ▶}
        1 => Project {#17338 ▶}
        2 => Project {#17339 ▶}
        3 => Project {#17340 ▶}
        4 => Project {#17341 ▶}
        5 => Project {#17342 ▶}
        6 => Project {#17343 ▶}
        7 => Project {#17344 ▶}
        8 => Project {#17345 ▶}
        9 => Project {#17346 ▶}
        10 => Project {#17347 ▶}
      ]
    }
  ]
  #touches: []
  +timestamps: true
  #hidden: []
  #visible: []
  #guarded: array:1 [▶]
}

我希望所有用户都能看到他工作的所有项目以及他工作的总时长。

【问题讨论】：

标签： php laravel eloquent relationship

【解决方案1】：

这只是一个错字。

foreach($user->projects as $a) {
    dump ($a);
}

确保删除括号()

【讨论】：