更新代码

app/Models/Favorite.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use App\User;
+use Auth;
+
+class Favorite extends Model
+{
+    public function user()
+    {
+        return $this->belongsTo(user::class)->withDefault();
+    }
+
+    public function item()
+    {
+        return $this->morphTo();
+    }
+
+    public function scopeMine($query)
+    {
+        return $query->where('user_id', Auth::id());
+    }
+
+    public static function isFavorite($item_id, $type)
+    {
+        $user_id   = Auth::id();
+        $item_type = "App\Models\\" . $type;
+        $num       = Self::where('user_id', $user_id)->where('item_id', $item_id)->where('item_type', $item_type)->count() ?? 0;
+        return $num;
+    }
+}