下载pod的时候如果只选了一个提单，提单有多个文件，zip名称以提单号命名

ccs_base/models/cc_bill_loading.py

@@ -778,8 +778,11 @@ class CcBL(models.Model):
             for name, data_b64 in files:
                 zf.writestr(name, base64.b64decode(data_b64))
         datas = base64.b64encode(buf.getvalue())
+        zip_name = 'POD.zip'
+        if len(self) == 1:
+            zip_name = f"{self.bl_no or self.id}.zip"
         att = self.env['ir.attachment'].sudo().create(
-            {'name': 'POD.zip', 'datas': datas, 'res_model': 'cc.bl', 'res_id': self[0].id,
+            {'name': zip_name, 'datas': datas, 'res_model': 'cc.bl', 'res_id': (self.id if len(self) == 1 else self[0].id),
              'mimetype': 'application/zip'})
         url = f"/web/content/ir.attachment/{att.id}/datas/{att.name}?download=true"
         return {'type': 'ir.actions.act_url', 'url': url, 'target': 'self'}