Question

我创建了自定义django-admin命令。我使用本教程Writing custom django-admin commands

例如，我的命令：

import os
from home.models import BuildTask

class Command(BaseCommand):
    def handle(self, *args, **options):

        tasks = BuildTask.objects.all()

        os.system("touch /Users/macbook/Desktop/Start.txt")

        if tasks:
            os.system("touch /Users/macbook/Desktop/TasksExist.txt")
        else:
            os.system("touch /Users/macbook/Desktop/TasksNotExist.txt")

        os.system("touch /Users/macbook/Desktop/End.txt")

当我通过使用终端运行此命令时：

python manage.py build_task

一切正常，我在Destop上获得3个文件。

但是当我使用crontab时，

* * * * *  /usr/bin/python /Users/macbook/builder/manage.py build_task

我只在桌面上获得1个文件（“Start.txt”）。显然，脚本会停止工作。

if tasks:

请帮帮我。有什么问题？

更新： / var / mail / macbook：

 File "/Users/macbook/workspace/acodebuilder/home/management/commands/build_apk.py",    
     line 26, in handle
 if tasks:
 File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 113, in 
     __nonzero__
 iter(self).next()
 File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 107, in 
     _result_iter
 self._fill_cache()
 File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 772, in 
     _fill_cache
 self._result_cache.append(self._iter.next())
 File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 273, in 
     iterator
 for row in compiler.results_iter():
 File "/Library/Python/2.7/site-packages/django/db/models/sql/compiler.py", line 680, in
    results_iter
 for rows in self.execute_sql(MULTI):
 File "/Library/Python/2.7/site-packages/django/db/models/sql/compiler.py", line 735, in 
     execute_sql
 cursor.execute(sql, params)
 File "/Library/Python/2.7/site-packages/django/db/backends/util.py", line 34, in 
     execute
 return self.cursor.execute(sql, params)
 File "/Library/Python/2.7/site-packages/django/db/backends/sqlite3/base.py", line 234, 
    in execute
 return Database.Cursor.execute(self, query, params)

 django.db.utils.DatabaseError: no such table: home_buildtask

为什么“没有这样的表”？

Answer 1

您应该能够通过运行mail命令查看命令的错误输出（如果有的话）。或者，您可以将&> ~/Desktop/django-command-error.log附加到crontab条目，并且cron作业的错误输出将保存到桌面上的django-command-error.log。

Answer 2

这是由SQLite db引起的问题，我们必须使用MySQL或PGSQL！

custom django-admin命令：使用模型和crontab的问题

2 个答案: