模型关系设置

app/Models/TechnologyStackModal.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 
 /**
  * 技术栈表
@@ -13,4 +14,13 @@ class TechnologyStackModal extends Model
     protected $table = 'technology_stacks';
 
     protected $guarded  = [];
+
+    /**
+     * 项目关联
+     * @return BelongsToMany
+     */
+    public function projects(): BelongsToMany
+    {
+        return $this->belongsToMany(ProjectModal::class, 'project_technology_stack_relations', 'technology_stack_id', 'project_id');
+    }
 }