テーブルに情報が反映されない。

Django allauthを使った認証機能実装をしようとしています。
formに入力して送信を押してもテーブルに反映されません。

form.py

form.py
1from django.utils.translation import gettext, gettext_lazy as _, pgettext
2from allauth.account.forms import SignupForm
3from django import forms
4from .models import CustomUser, Administrater
5from allauth.account.adapter import DefaultAccountAdapter
6
7class CustomSignupForm(SignupForm):
8    username = forms.CharField(
9        label=_("会社名"),
10        help_text='※必須',
11        widget=forms.TextInput(
12            attrs={"placeholder": _("会社名"), "autocomplete": "username", 'class':'companyinformation'}
13        ),
14    )
15    company_name_kana = forms.CharField(
16            label=("会社名カナ"),
17            help_text='※必須',
18            widget=forms.TextInput(
19              attrs={"placeholder":"会社名カナ", 'class':''} ) )
20    電話番号 = forms.CharField(
21            help_text='任意',
22            widget=forms.TextInput(
23              attrs={'placeholder':'電話番号', 'class':''}))
24    email = forms.EmailField(
25            help_text='※必須',
26            widget=forms.TextInput(
27                attrs={
28                    "type": "email",
29                    "placeholder": _("E-mail address"),
30                    "autocomplete": "email",
31                }
32            )
33    )
34    representative = forms.CharField(
35            label=('代表者名'),
36            help_text='※必須',
37            widget=forms.TextInput(
38              attrs={'placeholder':'代表者名', 'class': ''}))
39
40    # 担当者情報
41    administrater_lastname = forms.CharField(
42            label=('担当者名 性'),
43            help_text='※必須',
44            widget=forms.TextInput(
45              attrs={'placeholder':'担当者名 性', 'class': ''}))
46
47    class Meta:
48        model = CustomUser
49
50    def signup(self, request,user):
51        user.phone_number = self.cleaned_data['電話番号']
52        user.company_name = self.cleaned_data['username']
53        user.company_name_kana = self.cleaned_data['company_name_kana']
54        user.representative = self.cleaned_data['representative']
55　　　　 user.administrater_lastname = self.cleaned_data['administrater_lastname']
56        user.save()
57        return user

models.py

models.py
1from django.db import models
2from django.contrib.auth.models import AbstractUser
3
4class CustomUser(AbstractUser):
5  class Meta:
6    verbose_name_plural = '会社情報'
7
8  phone_number = models.CharField('電話番号', max_length=11,blank=True, default=0)
9  company_name = models.CharField('会社名', max_length=500,blank=True, default=0)
10  company_name_kana = models.CharField('会社名カナ', max_length=500, blank=True, default=0)
11  representative = models.CharField('代表者名', max_length=500, blank=True, default=0)
12
13
14# Create your models here.
15
16class Administrater(models.Model):
17  """docstring for Administrater"""
18  def __init__(self, arg):
19    super(Administrater, self).__init__()
20    self.arg = arg
21
22  def __str__(self):
23    return self.name
24
25  class Meta:
26    verbose_name_plural = "管理者情報"
27
28  CustomUser = models.ForeignKey(CustomUser, on_delete=models.CASCADE ,related_name='costomuser')
29  administrater_lastname = models.CharField('管理者情報', max_length=500,blank=True, default=0)

signup.html

signup.html
1{% load i18n %}
2{% load static %}
3<!DOCTYPE html>
4<html>
5<head>
6  <link rel="stylesheet" href="{% static 'css/accounts.css' %}">
7</head>
8<body>
9{% block content %}
10<div class="container">
11  <div class="row">
12    <div class="my-div-style">
13      <h1>会員登録</h1>
14        <h2>企業情報</h2>
15          <form action="{% url 'account_signup' %}" method="post" >
16            {% csrf_token%}
17            {{form.as_p}}
18
19        {% if redirect_field_value %}
20            <input type="hidden" name="{{ redirect_field_name}}" value="{{ redirect_field_value}}" />
21        {% endif %}
22        <button class="btn btn-primary" type="submit">次へ</button>
23      </form>
24    </div>
25  </div>
26</div>
27{% endblock %}
28</body>
29</html>
30

adapter.py

from allauth.account.adapter import DefaultAccountAdapter

class AccountAdapter(DefaultAccountAdapter):

    def save_user(self, request, user, form, commit=True):
        """
        This is called when saving user via allauth registration.
        We override this to set additional data on user object.
        """
        # Do not persist the user yet so we pass commit=False
        # (last argument)
        user = super(AccountAdapter, self).save_user(request, user, form, commit=False)
        user.phone_number = form.cleaned_data.get('電話番号')
        user.company_name = form.cleaned_data.get('username')
        user.company_name_kana =form.cleaned_data.get('company_name_kana')
        user.representative = form.cleaned_data.get('representative')

        user.administrater_lastname = form.cleaned_data.get('administrater_lastname')

        user.save()

フィールドに入力し、登録ボタンを押すときちんと遷移し、customuserテーブルにはデータが入りますが、administraterテーブルには入りません。

なぜでしょうか？