custom django-admin command: problems with use models and crontab - django

Question

I created custom django-admin command. I use this tutorial Writing custom django-admin commands
For example, my command:
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")
when i run this command by use terminal:
python manage.py build_task
everything is OK, i get 3 files on Destop.
But when i use crontab,
* * * * * /usr/bin/python /Users/macbook/builder/manage.py build_task
i just get 1 file on Desktop("Start.txt"). Apparently the script stops job on the line.
if tasks:
Please help me. What's the problem?
Update: /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
Why "no such table" ?

Answer 1

You should be able to see the error output of the command (if there was any) by running the mail command. Alternatively, you can append &> ~/Desktop/django-command-error.log to the crontab entry and the error output of the cron job will be saved to django-command-error.log on your desktop.

Answer 2

it's issue caused by SQLite db, We must use MySQL or PGSQL!