通过批量导出器/批量上传器下载应用引擎 ndb 实体 [英] dowload app engine ndb entities via bulk exporter / bulk uploader

问题描述

上下文:

我的模型类继承自基类:

My model classes inherit from a base class:

class BaseModel(ndb.model):
  # commom fields and methods

class SpecificModel(BaseModel):
  # specific fields and methods

问题:

我想使用 appengine bulkuploader 服务导出特定模型实体.

I want to export the SpecificModel entities using the appengine bulkuploader service.

我已经定义了配置文件(data_loader.py):

I have the defined the config file (data_loader.py):

import sys
sys.path.append('.') ## this is to ensure that it finds the file 'models.py'
from google.appengine.ext import ndb
from google.appengine.tools import bulkloader
from models import *

class SpecificModelExporter(bulkloader.Exporter):
  def __init__(self):
    bulkloader.Exporter.__init__(self, 'SpecificModel',
                                 [('fieldOne', str, None),
                                  ('fieldTwo', str, None)
                                 ])

    exporters = [ SpecificModelExporter ]

我使用以下命令下载数据:

I use the following command to download data:

  appcfg.py download_data --config_file=data_loader.py --filename=data.csv --kind=SpecificModel --url=http://url.appspot.com/_ah/remote_api

当我尝试下载数据时，出现以下错误:

When I try to download the data I get the following error:

google.appengine.ext.db.KindError: No implementation for kind 'SpecificModel'

有什么线索吗?

推荐答案

查看 源代码:

您的模型将通过

implementation_class = db.class_for_kind(kind_or_class_key)

但是 db 模型的注册表将不包括您定义的任何 ndb 模型.在 ndb.Model._kind_map 中创建了一个类似的注册表，并且您定义的任何 db 模型都不会在那里找到.

but the registry of db models will not include any ndb models you've defined. A similar registry is created in ndb.Model._kind_map and any db models you had defined would not be found there.

注意:就作为我可以告诉没有相应的问题/功能请求要求在批量加载器或等效的 ndb 批量加载器中提供 ndb 支持.可能值得提交一份并主演.

NOTE: As far as I can tell there is no corresponding issue/feature request asking for ndb support in the bulk loader or an equivalent ndb bulk loader. It may be worth filing one and starring it.

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