Formatting django form.non_field_errors in a template

Iterating through form.non_field_errors is not always the best approach, for instance in my case I wanted to display a tooltip like in this screenshot next to the field in question using Django Widget Tweaks.

project/app/templates/template.html

{% render_field field class="form-control is-invalid" data-toggle="tooltip" title=field.errors.as_text %}

Instead of messing around with template code to pass the HTML title attribute in one piece I followed the tip from @oblalex and wrote my own modified ErrorList class with a as_text method without asterisks.

project/app/utils.py

from django.forms.utils import ErrorList

class MyErrorList(ErrorList):
"""
Modified version of the original Django ErrorList class.

ErrorList.as_text() does not print asterisks anymore.
"""
    def as_text(self):
        return '\n'.join(self)

Now that the as_text() function is overwritten, you can pass your class MyErrorList as the error_class argument of your Form or ModelForm or like in my case some ModelForm formset:

project/app/views.py

from django.forms import formset_factory
from .forms import InputForm
from .utils import MyErrorList

def yourView(request):
    InputFormSet = formset_factory(InputForm)
    formset = InputFormSet(error_class=MyErrorList)

    context = {'formset': formset}
    return  render(request, 'template.html', context)

And now the tooltip looks like this without the asterisk.

Instead of passing the error_class every time you instantiate a form in your views, you can just add this one-liner to your form class (see this answer from @Daniel):

project/app/forms.py

from django import forms
from .utils import MyErrorList

class InputForm(forms.ModelForm):

    def __init__(self, *args, row, **kwargs):
        super(InputForm, self).__init__(*args, **kwargs)
        self.error_class = MyErrorList

Well, by default Django forms use ErrorList as error_class (proof link). As you can see, its as_text method formats list by prepending asterisks to values.

So, you can create some custom error_class with own as_text method and pass it to your form in a suitable manner.