初始化项目

app/model/PostCategory.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace app\model;
+
+use think\Model;
+
+/**
+ * @mixin think\Model
+ */
+class PostCategory extends Model
+{
+  //
+  public function post()
+  {
+    return $this->belongsTo(Post::class, 'post_id');
+  }
+
+  public function category()
+  {
+    return $this->belongsTo(Category::class,'category_id');
+  }
+}