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Thats' where related name or the reverse relationship comes in. Django, by defaults gives you a default related_name which is the ModelName (in lowercase) followed by _set - In this case, It would be profile_set , so group. profile_set . However, you can override it by specifying a related_name in the ForeignKey field.
The Django web framework includes a default object-relational mapping layer (ORM) that can be used to interact with application data from various relational databases such as SQLite, PostgreSQL and MySQL. The Django ORM is an implementation of the object-relational mapping (ORM) concept.
When we read the data from the model, Django returns queryset. Django has order_by method to sort the queryset in ascending and descending order. You can order the queryset on any field.
Put a hyphen before the field name.
.order_by('-date')
create list and
def messages_to_list(messages):
result = []
for message in messages:
result.append(message_to_list(message))
result.reverse()
return result
def message_to_list(message):
return {
'member': str(message.member),
'message': str(message.message),
'pub_date': str(message.pub_date.strftime(" %B %d,%Y, %A %I:%M%p ")),
'admin': message.admin
}
The result above will be ordered by pub_date descending, then by headline ascending.
Entry.objects.filter(pub_date__year=2005).order_by('-pub_date', 'headline')
If we had a Python sequence and looked at seq [-5:], we would see the fifth (last) element first. Django does not support this access mode (slicing from the end), because it cannot be done efficiently in SQL. (((((((((((((((((((((((((((((
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