Laravel 5.4：无法从关系中检索数据

I'm trying to display the name of the assignee (foreign key from Users table) of each ticket by storing each name in an array from two UNION'd tables (Accesses and Reports) but it gives me this error. ErrorException Undefined property: stdClass::$assignee.

//HomeController
    $accesses = DB::table('accesses')
                ->select(array('id', 'fullname','emp_id','shift','state','resolved_at', 'closed_at','assigned_to'))
                ->where('state','=','Assigned');

    $all = DB::table('reports')
                ->select(array('id', 'fullname','emp_id','shift','state','resolved_at', 'closed_at','assigned_to'))
                ->union($accesses)
                ->where('state', '=', 'Assigned')
                ->get();

    $names[] = array();

    foreach ($all as $one)//store in array to display in a chart
    {
      $names[] = $one->assignee->name; //error here
    }




   //Report Model
   public function assignee()
   {
      return $this->belongsTo(User::class, 'assigned_to');
   }

   //Access Model
   public function assignee()
   {
      return $this->belongsTo(User::class, 'assigned_to');
   }

  //Report Migration
  public function up()
  {
    Schema::create('reports', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('user_id')->nullable();
        $table->string('fullname');
        $table->string('emp_id');
        $table->string('shift');
        $table->longText('report');
        $table->string('status')->default('Pending'); //Pending, Approved
        $table->string('state')->default('Open'); //Open, Assigned, Resolved, Closed
        $table->date('resolved_at')->nullable();
        $table->date('closed_at')->nullable();
        $table->integer('assigned_to')->nullable();
        $table->longText('action')->nullable();
        $table->timestamps();
    });
   }

   //Access Migration
   public function up()
   {
    Schema::create('accesses', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('user_id')->nullable();
        $table->string('fullname');
        $table->string('emp_id');
        $table->string('shift');
        $table->string('request');
        $table->longText('note')->nullable();
        $table->string('status')->default('Pending'); //Pending, Approved
        $table->string('state')->default('Open'); //Open, Assigned, Resolved, Closed
        $table->date('resolved_at')->nullable();
        $table->date('closed_at')->nullable();
        $table->integer('assigned_to')->nullable();
        $table->longText('action')->nullable();
        $table->timestamps();
    });
   }

It gives me this error

The results should be like this

You should use merge method of collection:

$accesses = Access::select(array('id', 'fullname','emp_id','shift','state','resolved_at', 'closed_at','assigned_to'))
            ->where('state','=','Assigned')
            ->get();

$reports = Report::select(array('id', 'fullname','emp_id','shift','state','resolved_at', 'closed_at','assigned_to'))
            ->where('state', '=', 'Assigned')
            ->get();

$all = $accesses->merge($reports);

Your question isn't entirely clear, but it seems that you only actually need the name of the user. This is untested, because I don't have a data set to test against. But it should find the name of all users who have an assigned Access or an assigned State.

$names = DB::table('users')
    ->select('users.name')
    ->leftJoin('accesses', function ($join) {
        return $join->on('users.id', '=', 'accesses.assigned_to')
            ->where('accesses.state', '=', 'Assigned');
    })
    ->leftJoin('reports', function ($join) {
        return $join->on('users.id', '=', 'reports.assigned_to')
            ->where('reports.state', '=', 'Assigned');
    })
    ->where(function ($query) {
        return $query->whereNotNull('accesses.id')
            ->orWhereNotNull('reports.id');
    })
    ->groupBy('users.id');