refactor: kb & station & terminal

app/Models/Station.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Station extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'description',
+    ];
+
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::deleting(function (Station $station) {
+            $station->terminals()->update(['station_id' => null]);
+        });
+    }
+
+    public function terminals(): HasMany
+    {
+        return $this->hasMany(Terminal::class);
+    }
+
+    public function knowledgeBases(): BelongsToMany
+    {
+        return $this->belongsToMany(KnowledgeBase::class);
+    }
+
+    public function users(): BelongsToMany
+    {
+        return $this->belongsToMany(User::class);
+    }
+
+    public function guides(): BelongsToMany
+    {
+        return $this->belongsToMany(Guide::class);
+    }
+}