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Using a Non-Default Manager with GenericForeignKey()


Using a Non-Default Manager with GenericForeignKey()

By : Carmen Acosta
Date : October 17 2020, 11:12 AM
hope this fix your issue I have the exact same issue as you, and after diving into the documentation/source it looks like Django does not provide an out of the box way to do this. The simplest method I found was to subclass GenericForeignKey and then override the __get__ method.
The troublesome line is where it calls:
code :


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Django Manager - Override the default get_query_set to set a default "GROUP BY"

Django Manager - Override the default get_query_set to set a default "GROUP BY"


By : Nikola Špirić
Date : March 29 2020, 07:55 AM
seems to work fine .count() actually creates a new query, with the fields removed and replaced with COUNT(*). It's actually not possible to group by a field and do a count on the grouped table in plain SQL. Basically, your originally query looked like this in SQL:
code :
SELECT myapp_variant.id, myapp_variant.name, myapp_variant.etc, ...
FROM myapp_variant inner join myapp_project on myapp_variant.project_id = myapp_project.id
WHERE myapp_project.name='zam'
GROUP BY myapp_variant.name
SELECT COUNT(*)
FROM myapp_variant inner join myapp_project on myapp_variant.project_id = myapp_project.id
WHERE myapp_project.name='zam'
COUNT
-----
    4 
    1
    1
    1
>>> print Variant.objects.filter(project__name__icontains="zam").group_by_name().query

>>> print Variant.objects.filter(project__name__icontains="zam").group_by_name().count().query
len(Variant.objects.filter(project__name__icontains="zam").group_by_name())
{{ grouped_variants|length }}
Default Manager in Django

Default Manager in Django


By : user2087287
Date : March 29 2020, 07:55 AM
wish of those help The authentication framework expects that the default manager on your User object implements some extra methods. The basic methods are implemented in django.contrib.auth.models.BaseUserManager, the model-specific methods are implemented in django.contrib.auth.models.UserManager. If your user model is similar to the default implementation (that is, it defines the username, email, is_staff, is_active, is_superuser, last_login, and date_joined fields), you can just use the UserManager. Otherwise, you'll have to create a subclass of BaseUserManager, and implement the create_user and create_superuser methods.
As you are using AbstractUser as a base class, you can use the UserManager class, or if you need to define any additional methods, a subclass of UserManager.
Anyone know how to utilize Wordpress Plugin(Event Manager)? I need convert default event manager listview into another v

Anyone know how to utilize Wordpress Plugin(Event Manager)? I need convert default event manager listview into another v


By : Iman Sohrabi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , There would be a file plugins->events manager->templates->templates->events-list.php with code as below,
code :
$args = apply_filters('em_content_events_args', $args);

if( get_option('dbem_css_evlist') ) echo "<div class='css-events-list'>";

echo EM_Events::output( $args );

if( get_option('dbem_css_evlist') ) echo "</div>";
echo EM_Events::output(array('format'=>
'<a href="#_EVENTURL" border=0></a>
<B>#_EVENTLINK</B><br/>#_EVENTDATES #_EVENTTIMES<BR/>
<i>#_LOCATIONNAME, #_LOCATIONADDRESS, #_LOCATIONTOWN</i>
<br/><a href="#_EVENTURL">Details & map</a><HR>',
'limit'=>20, 'pagination'=>1));
What is the difference between creating a model instance using the default Manager and Customer Manager

What is the difference between creating a model instance using the default Manager and Customer Manager


By : Rohan
Date : March 29 2020, 07:55 AM
around this issue Well in this simplest case, there is no difference. The reason of describing this technique in docs is obvious there
code :
class BookManager(models.Manager):
    def create_book(self, title):
        # you can do some extra stuff here for instance creation
        book = self.create(title=title)
        # or here when it is saved to db
        return book
Should my soft-deletion-honouring model manager be my model's default manager?

Should my soft-deletion-honouring model manager be my model's default manager?


By : Y.Takenaka
Date : March 29 2020, 07:55 AM
it should still fix some issue As per this documentation, if you run ./manage.py dumpdata -a or ./manage.py dumpdata --all, then it will dump data using default manager instead of custom manager. If you want to use your default manager instead of custom manager(without changing in models) then you can try like this:
code :
objects = YourModel._base_manager
objects.all()
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