修复内容统计

app/model/Articles.php

@@ -47,7 +47,7 @@ class Articles extends Model
         'publisher'  => 'integer',
         'create_time' => 'datetime',
         'update_time' => 'datetime',
-        'publishdate' => 'datetime',
+        'publish_date' => 'datetime',
         'delete_time' => 'datetime',
     ];