class SupplierAccountInline(admin.TabularInline):
        model = SupplierAccount


    @admin.register(EUser)
    class EUserAdmin(admin.ModelAdmin):
        list_display = ('user', 'temp_user', 'service_type', 'address', 'online_account', )
        inlines = [SupplierAccountInline, ]

class EUser(models.Model):
        alpha_supplier = models.OneToOneField(SupplierAccount, related_name='gas_account', null=True)
        beta_supplier = models.OneToOneField(SupplierAccount, related_name='power_account', null=True)
        combined_supplier = models.OneToOneField(SupplierAccount, null=True)
        address = models.ForeignKey(Address, null=True)
        temp_user = models.CharField(max_length=255, null=True)
        user = models.OneToOneField(settings.AUTH_USER_MODEL, null=True, default=None)

class SupplierAccount(models.Model):
    supplier = models.ForeignKey(Supplier)
    username = models.CharField(max_length=255, null=True)
    password = models.CharField(max_length=255, null=True)