update

app/common/model/Maintenance.php

@@ -14,6 +14,7 @@ namespace app\common\model;
 
 use cores\BaseModel;
 use think\model\relation\BelongsTo;
+use think\model\relation\HasOne;
 
 /**
  * 文件库分组模型
@@ -36,4 +37,11 @@ class Maintenance extends BaseModel
         $module = self::getCalledModule();
         return $this->BelongsTo("app\\{$module}\\model\\MaintenanceCategory", 'category_id');
     }
+
+    public function catImg(): HasOne
+    {
+        $module = self::getCalledModule();
+        return $this->hasOne("app\\{$module}\\model\\UploadFile", 'file_id', 'img_id')
+            ->bind(['img_url' => 'preview_url']);
+    }
 }

app/common/model/MaintenanceCategory.php

@@ -47,7 +47,7 @@ class MaintenanceCategory extends BaseModel
     public function getList(array $where = []): \think\Collection
     {
         return $this->where($where)
-            ->with(['maintenances'])
+            ->with(['maintenances.catImg'])
             ->order(['sort', $this->getPk()])
             ->select();
     }

app/store/model/Maintenance.php

@@ -109,11 +109,4 @@ class Maintenance extends  MaintenanceModel
     {
         return (new static)->where($where)->where('is_delete', '=', 0)->count();
     }
-
-    public function catImg(): HasOne
-    {
-        $module = self::getCalledModule();
-        return $this->hasOne("app\\{$module}\\model\\UploadFile", 'file_id', 'img_id')
-            ->bind(['img_url' => 'preview_url']);
-    }
 }