Category: Python Answers

Sometimes, we want to fix get() returned more than one topic with Python Django.

In this article, we’ll look at how to fix get() returned more than one topic with Python Django.

How to fix get() returned more than one topic with Python Django?

To fix get() returned more than one topic with Python Django, we can use get to get a row results results that only returns a single row.

For instance, we write

Model.objects.get(field_name=some_param)

to call get by querying the field_name to return the row in a result that has a single row.

If the result has more than one row, then we use filter by writing

Model.objects.filter(field_name=some_param)

Conclusion

To fix get() returned more than one topic with Python Django, we can use get to get a row results results that only returns a single row.

Sometimes, we want to fix ImportError: Couldn’t import Django with Python Django.

In this article, we’ll look at how to fix ImportError: Couldn’t import Django with Python Django.

How to fix ImportError: Couldn’t import Django with Python Django?

To fix ImportError: Couldn’t import Django with Python Django, we create a virtualenv and then we install the django` package in the virtualenv.

To create the virtualenv, we run

sudo pip3 install virtualenv

Then we go to the virtualenv by running

$ virtualenv newenv
$ source newenv/bin/activate

and then we run

pip install django

to install the django package.

Conclusion

To fix ImportError: Couldn’t import Django with Python Django, we create a virtualenv and then we install the django` package in the virtualenv.

Sometimes, we want to fix Direct assignment to the forward side of a many-to-many set is prohibited. Use emails_for_help.set() instead with Python Django.

In this article, we’ll look at how to fix Direct assignment to the forward side of a many-to-many set is prohibited. Use emails_for_help.set() instead with Python Django.

How to fix Direct assignment to the forward side of a many-to-many set is prohibited. Use emails_for_help.set() instead with Python Django?

To fix Direct assignment to the forward side of a many-to-many set is prohibited. Use emails_for_help.set() instead with Python Django, we should add our many to many relations objects after the original object is created.

For instance, we write

class SetUser(FormView):
    template_name="templates/set_up_user.html"
    form_class = Set_User_Form
    success_url = '/thanks/'

    def form_valid(self, form):
        org = form.cleaned_data.get('organization')
        emails = form.cleaned_data.get("share_email_with")

        users = User.objects.filter(email__in=emails)
        instance = SetupUser.objects.create(organization=org)

        for user in users:
            instance.emails_for_help.add(user)

        return redirect("/")

to create the user object with

instance = SetupUser.objects.create(organization=org)

And then we add the user into the emails_for_help many to many field by writing

for user in users:
    instance.emails_for_help.add(user)

Conclusion

To fix Direct assignment to the forward side of a many-to-many set is prohibited. Use emails_for_help.set() instead with Python Django, we should add our many to many relations objects after the original object is created.

Sometimes, we want to parse request.body from POST in Python Django.

In this article, we’ll look at how to parse request.body from POST in Python Django.

How to parse request.body from POST in Python Django?

To parse request.body from POST in Python Django, we can decode request.body into a string.

And then we can call json.loads on the decoded string.

For instance, we write

body_unicode = request.body.decode('utf-8')
body = json.loads(body_unicode)
content = body['content']

in a view function.

We call decode to decode request.body into a JSON string.

Then we call json.loads on the string into a dict.

Conclusion

To parse request.body from POST in Python Django, we can decode request.body into a string.

And then we can call json.loads on the decoded string.

Sometimes, we want to take values from a POST request with Python Django.

In this article, we’ll look at how to take values from a POST request with Python Django.

How to take values from a POST request with Python Django?

To take values from a POST request with Python Django, we can use request.POST.

For instance, we write

<input type="hidden" name="title" value="{{ source.title }}">

in our template.

Then in a view, we write

request.POST.get("title", "")

to get the input’s value by calling get with the name attribute value of the input field.

Conclusion

To take values from a POST request with Python Django, we can use request.POST.