我不知道我在做什么错，因为它可以与应用程序中的所有其他模型一起使用。我刷新并重新播种了数据库多次。并且这些模型扩展了相同的抽象方法
这是控制器中的代码：
$substrates = $this->substrates->all()->toArray();
$temp = json_encode($substrates);
dd($temp, json_last_error(), json_last_error_msg(), $substrates);
这是dd（）的输出：false 8“不支持类型”
数组：119 [？
0 => array：21 [？
"id" => 1
"name" => "Wood Free"
"machine_id" => 2
"classification" => "Cover"
"origins" => "Coming Soon"
"duplex" => true
"color" => "Translucents"
"texture" => "Leather"
"finish" => "Felt"
"product_type" => "Sheet"
"caliper" => "0.06"
"m_weight" => 70
"width" => "46.40"
"height" => "32.00"
"pic" => stream resource @17 ?}
"price" => "0.30"
"created_by" => 38
"updated_by" => 16
"deleted_at" …