refactor: kb & station & terminal

app/Models/KnowledgeBase.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\SoftDeletes;
@@ -30,4 +31,31 @@ class KnowledgeBase extends Model
     {
         return $this->hasMany(Document::class);
     }
+
+    /**
+     * 获取知识库关联的线站
+     *
+     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
+     */
+    public function stations()
+    {
+        return $this->belongsToMany(Station::class);
+    }
+
+    /**
+     * 按用户线站过滤：全局 KB（无线站关联）+ 用户线站关联的 KB
+     */
+    public function scopeAccessibleBy(Builder $query, User $user): Builder
+    {
+        if (!$user->hasStationRestriction()) {
+            return $query;
+        }
+
+        $stationIds = $user->getAccessibleStationIds();
+
+        return $query->where(function (Builder $q) use ($stationIds) {
+            $q->whereDoesntHave('stations')
+              ->orWhereHas('stations', fn ($sq) => $sq->whereIn('stations.id', $stationIds));
+        });
+    }
 }