Author: John Au-Yeung

Sometimes, we want to allow only one radio button to be checked with Python Django.

In this article, we’ll look at how to allow only one radio button to be checked with Python Django.

How to allow only one radio button to be checked with Python Django?

To allow only one radio button to be checked with Python Django, we set the radio buttons in the group to the same name.

For instance, we write

{% for each in AnswerQuery %}
    <form action={{address}}>
        <span>{{each.answer}}</span><input type='radio' name="radAnswer" >
        <span>Votes:{{each.answercount}}</span>
        <br>
    </form>
{% endfor %}

to set the name attribute of all radio buttons to radAnswer.

Then we can only select one button from the group.

Conclusion

To allow only one radio button to be checked with Python Django, we set the radio buttons in the group to the same name.

Sometimes, we want to pass additional parameters to the as_view method in a Python Django class-based view.

In this article, we’ll look at how to pass additional parameters to the as_view method in a Python Django class-based view.

How to pass additional parameters to the as_view method in a Python Django class-based view?

To pass additional parameters to the as_view method in a Python Django class-based view, we can use the slug property.

For instance, we write

from django.views.generic import DetailView

class MyView(DetailView):
    template_name = 'detail.html'
    model = MyModel
    slug = None

    def get_object(self, queryset=None):
        return queryset.get(slug=self.slug)

to create the MyView view class.

In the get_object view method, we get the slug value from self.slug.

Conclusion

To pass additional parameters to the as_view method in a Python Django class-based view, we can use the slug property.

Sometimes, we wan to get all related Python Django model objects.

In this article, we’ll look at how to get all related Python Django model objects.

How to get all related Python Django model objects?

To get all related Python Django model objects, we use the NestedObjects class.

For instance, we write

from django.contrib.admin.utils import NestedObjects

collector = NestedObjects(using="default") 
collector.collect([objective])
print(collector.data)

to create a NestedObjects object with the using argument set to the database name.

Then we call collect with an array of objects to get the related objects.

Finally, we get the data from collector.data.

Conclusion

To get all related Python Django model objects, we use the NestedObjects class.

Sometimes, we want to duplicate virtualenv with Python.

In this article, we’ll look at how to duplicate virtualenv with Python.

How to duplicate virtualenv with Python?

To duplicate virtualenv with Python, we can generate a requirements file.

To do this, we run

pip freeze > requirements.txt

to record the package in the virtualenv into requirements.txt.

Then when we create a new virtualenv, we run

pip install -r requirements.txt

to install the packages from requirements.txt.

Conclusion

To duplicate virtualenv with Python, we can generate a requirements file.

Sometimes, we want to copy InMemoryUploadedFile object to disk with Python Django.

In this article, we’ll look at how to copy InMemoryUploadedFile object to disk with Python Django.

How to copy InMemoryUploadedFile object to disk with Python Django?

To copy InMemoryUploadedFile object to disk with Python Django, we can use the save method.

For instance, we write

import os
from django.core.files.storage import default_storage
from django.core.files.base import ContentFile
from django.conf import settings

data = request.FILES['image']

path = default_storage.save('tmp/somename.mp3', ContentFile(data.read()))
tmp_file = os.path.join(settings.MEDIA_ROOT, path)

in our view function.

We get the file from request.FILES.

And then we call default_storage.save with the file path to save to and the ContentFile object that we create by reading data.

Then we get the path of the saved file with os.path.join(settings.MEDIA_ROOT, path).

Conclusion

To copy InMemoryUploadedFile object to disk with Python Django, we can use the save method.