getattr

Question

我在模型名称中使用变量时遇到问题，我想执行此命令：

MyVar.objects.all().delete()

同样，我也有一个问题：

class MyCsvModel(CsvDbModel):
            class Meta:
                dbModel = MyVar
                delimiter = delimiter_csv

这些操作是在 class 的方法上进行的。变量是在此处方法创建的。

对不起我的英语，我是初学者...

编辑：

我的代码：

from etl.models import MvmtjExportTemps, MvmtjExport
from django.db import models

[...]
model_name = self.table_temporaire[self.numero_edi]
getattr(models, model_name).objects.all().delete()


class MyCsvModel(CsvDbModel):
    class Meta:
        dbModel = getattr(models, model_name)
        delimiter = delimiter_csv

我得到了这个结果：

Environment:

Request Method: GET Request URL: http://127.0.0.1:8000/etl/integration/

Django Version: 1.8.18 Python Version: 3.6.1 Installed Applications: ['django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'pec', 'topo', 'bootstrap3_datetime', 'todo_app', 'debug_toolbar', 'bi', 'etl'] Installed Middleware: ['debug_toolbar.middleware.DebugToolbarMiddleware', 'django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback: File "C:\git\ATH_intranet\env_p3\lib\site-packages\django\core\handlers\base.py" in get_response 132. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "c:\git\ATH_intranet\etl\views.py" in IntegrationExtraction 188. importation.ImportationTableTemporaire(fichier) File "c:\git\ATH_intranet\etl\class_perso.py" in ImportationTableTemporaire 112. getattr(models, model_name).objects.all().delete()

Exception Type: AttributeError at /etl/integration/ Exception Value: module 'django.db.models' has no attribute 'MvmtjExportTemps'

编辑 2：

最后我需要像这样在 import 和 getattr 中添加位置 :

import etl.models

        #vidange table temporaire
        model_name = self.table_temporaire[self.numero_edi]
        getattr(etl.models, model_name).objects.all().delete()

        # creation de la class correspondant a la table temporaire

        class MyCsvModel(CsvDbModel):
            class Meta:
                dbModel = getattr(etl.models, model_name)
                delimiter = delimiter_csv

Answer 1

import models 
model_name = "X"

getattr(models, model_name).objects.all().delete()

class MyCsvModel(CsvDbModel):
            class Meta:
                dbModel = getattr(models, model_name)
                delimiter = delimiter_csv

getattr - 异常值：模块 'django.db.models' 没有属性 'model_name''

getattr - Exception Value: module 'django.db.models' has no attribute 'model_name''

python

django

variables