Django formset for models without foreign key

I'm trying to use formset to create connections between my Neo4j nodes. These models have been constructed using the django-neomodel package. They aren't related using foreign keys, but since this isn't an inline formset that shouldn't matter, right?

models.py

class Person(DjangoNode):    uid = UniqueIdProperty()    name = StringProperty(max_length=50)    created_at = DateTimeProperty(default=datetime.now)      friends = RelationshipTo('Friend', 'FRIENDED', model=FriendRel)      # DjangoNode class must have a Meta class and documentation specifies 'django_node'    class Meta:      app_label = 'django_node'      class FriendRel(DjangoRel):    created_at = DateTimeProperty(default=datetime.now)      class Meta:      app_label = 'django_rel'

forms.py

class PersonForm(forms.ModelForm):    class Meta:      model = Person      # don't need fields for automatically assigned keys like `uid` and `created_at`      fields = ['name']      class FriendRelForm(forms.ModelForm):    class Meta:       model = FriendRel      exclude = () #"creating ModelForm without either 'fields' || 'exclude' attribute is prohibited"    FriendRelFormSet = formset_factory(FriendRelForm, extra=1)

form.html

<div>    <form action="" method="post">{% csrf_token %}      {{ form.as_p }}        <table class="table">        {{ friends.management_form }}          {% for form in friends.forms %}          {% if forloop.first %}            <thead>              <tr>                {% for field in form.visible_fields %}                  <th>{{ field.label|capfirst }}</th>                {% endfor %}              </tr>            </thead>          {% endif %}          <tr class="{% cycle "row1" "row2" %} formset_row">            {% for field in form.visible_fields %}              <td>                <!-- Include the hidden fields in the form -->                {% if forloop.first %}                  {% for hidden in form.hidden_fields %}                    {{ hidden }}                  {% endfor %}                {% endif %}                {{ field.errors.as_ul }}                {{ field }}              </td>            {% endfor %}          </tr>        {% endfor %}      </table>      <input type="submit" value="Save"/>    </form>  </div>

I'm expecting a "friend" formset to appear in the rendered form, but am not quite sure how to get it there. If I add the following I get an error:

  class FriendRelForm(forms.ModelForm):      class Meta:         model = FriendRel        exclude = ()        fields = ['friends']    ***ERROR*** django.core.exceptions.FieldError: Unknown field(s) (friends) specified for FriendRel

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