Query when parameter is none django

Question

I want to make a query, something like

Model.objects.filter(x=x).filter(y=y).filter(z=z) 

... but there are some cases when for example y

Answer 1

You can create a model manager and then assign it to your model so that you can use this manager to any model. This solution is more pythonic.

class GridManager(models.Manager):

    def applyFilters(self, *args, **kwargs):
         new_kwargs = {}
         for eachKey in kwargs:
             val = kwargs[eachKey]
             if val != '' and val != None:
                 new_kwargs[eachKey] = val
         if new_kwargs:
             return super(GridManager, self).get_query_set().filter(*args, **new_kwargs)
         else:
             return super(GridManager, self).get_query_set()

Assign this manager to your model:

class some_model(models.Model):
     your fields.....
     ......
     objects = models.Manager()
     grid_manager = GridManager()

And in your view you can use the above manager as:

objects = some_model.grid_manager.applyFilters(x=value, y = value, z = None)

Now you don't have to worry about the none values. Hope this helps.