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application/admin/model/Invoice.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace app\admin\model;
+
+use think\Model;
+
+class Invoice extends Model
+{
+    protected $name = 'invoice';
+
+    public function user()
+    {
+        return $this->belongsTo(User::class, 'uid', 'id');
+    }
+}
+

application/admin/model/InvoiceLog.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace app\admin\model;
+
+use think\Model;
+
+class InvoiceLog extends Model
+{
+    protected $name = 'invoice_log';
+
+    public function invoice()
+    {
+        return $this->belongsTo(Invoice::class, 'invoice_id', 'id');
+    }
+
+    public function order()
+    {
+        return $this->belongsTo(Order::class, 'oid', 'id');
+    }
+}