Question

I am having trouble in understanding how to iterate over QuerySet , Tuple and Dictionarty in django.

I am confused which djnago functions returns what like objects.all or objects.get

Suppose i have

a = model.objects.all()
b = model.object.get(pk=1)
c = Blog.objects.values('name', 'entry__headline')
d = Entry.objects.values_list('id', 'headline')
e = Person.objects.raw('SELECT * FROM myapp_person')

What is the retured in each scenario and the biggest problem is how can i iterate over.
All these confuse me very much . I studies the docs but they tell one thing and don’t tell how to use in template. I know its related to python but then python don’t have template to deal with

Answer 1

Are you referring to these docs? https://docs.djangoproject.com/en/dev/ref/templates/builtins/#for

I think that’s what you were looking for.

Basically you iterate over them like:

{% for item in a %}
{{item.field}}
{{item.field2}}
{% endfor %}

{{b.field}}

{% for item in c %}
{{item.name}}
{{item.entry__headline}}
{% endfor %}

{% for item in d %}
{{item}}
{% endfor %}

# Also you can do this if you want to access just a particular index:
{{d.0}}
{{d.1}}

{% for item in e %}
{{item.field}}
{{item.field2}}
{% endfor %}

As for your data types:
a would be a QuerySet or list of model objects
b would be a model object
c would be a ValuesQuerySet or a list of dictionaries
d would also be a ValuesQuerySet but it’s actually a list of tuples
e would be a RawQuerySet, which acts like a normal QuerySet

Sources:
https://docs.djangoproject.com/en/dev/topics/db/sql/#django.db.models.Manager.raw
https://docs.djangoproject.com/en/dev/ref/models/querysets/#values
https://docs.djangoproject.com/en/dev/ref/models/querysets/#values-list