Example Wagtail model with multiple contacts

models.py

from django.db import models

from wagtail.core.fields import RichTextField
from wagtail.admin.edit_handlers import FieldPanel, InlinePanel

from wagtail.core.models import Orderable
from modelcluster.fields import ParentalKey
from modelcluster.models import ClusterableModel

GENDER_CHOICES = (
    ('M', 'Male (him/his)'),
    ('F', 'Female (she/her)'),
    ('I', 'Neutral (it/its)'),
    ('?', 'Prefer not to say'),
)

class ContactItem(ClusterableModel):
    url = models.URLField(max_length=1024, blank=True,
        verbose_name='E-mail address')
    email = models.EmailField(max_length=255, blank=True,
        verbose_name='Social media or personal web link')
    panels = [
        FieldPanel('url'),
        FieldPanel('email'),
    ]
    class Meta:
        abstract = True
    def __str__(self):
        return ' '.join([self.url, self.email])

class ContactPerson(Orderable, ContactItem):
    contact = ParentalKey(
        'connect.ContactItem', on_delete=models.CASCADE,
        related_name='person_contact')

class Person(ClusterableModel):
    last_name = models.CharField(max_length=255,
        verbose_name='Last name')
    given_names = models.CharField(max_length=255, blank=True,
        verbose_name='Given name(s)')
    title = models.CharField(max_length=255, blank=True,
        verbose_name='Title')
    gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
    position = models.CharField(max_length=255, blank=True)
    biography = RichTextField(blank=True)
    source_id = models.IntegerField(blank=True)

    content_panels = [
        FieldPanel('title'),
        FieldPanel('first_name'),
        FieldPanel('last_name'),
        FieldPanel('gender'),
        FieldPanel('position'),
        FieldPanel('biography'),
        InlinePanel('person_contact', label='Contacts'),
    ]

    def fullname(self):
        return " ".join([ self.title, self.given_names, self.last_name ])

    def __repr__(self):
        return self.fullname()

    def dict(self):
        return {
            'id': self.id,
            'fullname': self.fullname(),
            'position': self.position or '',
            'biography': self.biography or '',
            # 'emails': (self.related_contacts or '').split(';'),
        }