add pack and update items & packegs & cycles

app/Pack.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Pack extends Model
+{
+    public $fillable = ['name', 'sterile_date', 'expire_date', 'sterilizer_id', 'cycle_number', 'lot_number', 'department', 'user_id', 'note'];
+    public function user()
+    {
+        return $this->belongsTo('App\User');
+    }
+    public function packages()
+    {
+        return $this->belongsToMany('App\Package', 'pack_package');
+    }
+    public function cycles()
+    {
+        return $this->belongsToMany('App\Cycle', 'cycle_pack');
+    }
+
+}