将 QuerySet 转换为 Django 中的 python 列表

Question

I have this script:

lec_name = request.POST['selected_name']
data = Schedules.objects.filter(name=lec_name)
data_list = data.values_list('schedule', flat=True)
print(data_list)

This gives below OUTPUT:

<QuerySet ["[['1', 'Subject 01', 'Hall 01', 'Tuesday'], ['2', 'Subject 02', 'Hall 03', 'Monday']]"]>

Then I tried below script to convert data_list to a list:

converted_list = list(data_list)

This gives below OUTPUT:

["[['1', 'Subject 01', 'Hall 01', 'Tuesday'], ['2', 'Subject 02', 'Hall 03', 'Monday']]"]

This works fine. But I'm not getting the expected output properly.

EXPECTED OUTPUT :

[['1', 'Subject 01', 'Hall 01', 'Tuesday'], ['2', 'Subject 02', 'Hall 03', 'Monday']]

How can I solve this? I found a lot of answers about this, but none helped. I'm using Python 3.7.4, Django 3.0.1

UPDATE

Here is my Schedules model:

class Schedules(models.Model):
    name = models.CharField(max_length=224)
    semester = models.CharField(max_length=20)
    hall_n_time = models.CharField(max_length=1000)
    schedule = models.CharField(max_length=1000)

hall_n_time and schedule columns in database, They have two python lists as strings. For an example, schedule column stores [['1', 'Subject 01', 'Hall 01', 'Tuesday'], ['2', 'Subject 02', 'Hall 03', 'Monday']] list as a string.

Answer 1

You have assumed that values_list flat parameter would decode json string which is not the case.

It just returns single value instead of tuple

If you only pass in a single field, you can also pass in the flat parameter. If True, this will mean the returned results are single values, rather than one-tuples

It returns exactly as mentioned, an array of schedule strings ( could be more of them )

["[['1', 'Subject 01', 'Hall 01', 'Tuesday'], ['2', 'Subject 02', 'Hall 03', 'Monday']]"]

you still need to json.loads() your JSON string to decode it

converted_list = [json.loads(item) for item in data_list]