fix: ticket reply_status semantics, N+1 query, and admin reply auto-reopen

app/Models/Ticket.php

@@ -39,6 +39,9 @@ class Ticket extends Model
         self::STATUS_CLOSED => '关闭'
     ];
 
+    const REPLY_STATUS_WAITING = 0;
+    const REPLY_STATUS_REPLIED = 1;
+
     public function user(): BelongsTo
     {
         return $this->belongsTo(User::class, 'user_id', 'id');

app/Models/TicketMessage.php

@@ -29,6 +29,7 @@ class TicketMessage extends Model
     ];
 
     protected $appends = ['is_from_user', 'is_from_admin'];
+    protected $hidden = ['ticket'];
 
     /**
      * 关联的工单
@@ -43,7 +44,7 @@ class TicketMessage extends Model
      */
     public function getIsFromUserAttribute(): bool
     {
-        return $this->ticket->user_id === $this->user_id;
+        return $this->ticket && $this->ticket->user_id === $this->user_id;
     }
 
     /**
@@ -51,6 +52,6 @@ class TicketMessage extends Model
      */
     public function getIsFromAdminAttribute(): bool
     {
-        return $this->ticket->user_id !== $this->user_id;
+        return $this->ticket && $this->ticket->user_id !== $this->user_id;
     }
 }