custom attribute displaying but is not saving in magento 2 admin customer creation form - magento2

Question

i have created new customer attribute in my magento 2 environment
field is added the data in that filed is not saving.i am getting error as something went wrong while saving data.there is no good tutorials i could find to add new attribute.please help with this.
i have followed this code
https://magento.stackexchange.com/questions/128178/magento-2-add-custom-attribute-in-customer-registration-form

Answer 1

Customer Registration Custom attribute value create in admin and save
1. Text Field
2. Drop Down Field
3. Date Field
Using UpgradeSchema.php
<?php
namespace {CompanyName}\{ModuleName}\Setup;
use Magento\Customer\Model\Customer;
use Magento\Customer\Setup\CustomerSetup;
/* irrelevant */
#use Magento\Framework\Setup\UpgradeSchemaInterface;
use Magento\Framework\Setup\InstallSchemaInterface;
use Magento\Framework\Setup\ModuleContextInterface;
/* irrelevant */
#use Magento\Framework\Setup\SchemaSetupInterface;
/* add this */
use Magento\Framework\Setup\UpgradeDataInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
class UpgradeData implements UpgradeDataInterface
{
private $customerSetupFactory;
public function __construct(\Magento\Customer\Setup\CustomerSetupFactory $customerSetupFactory)
{
$this->customerSetupFactory = $customerSetupFactory;
}
public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{
if (version_compare($context->getVersion(), '1.0.1', '<'))
{
// For Text field
$customerSetup->addAttribute(
\Magento\Customer\Model\Customer::ENTITY,
'attribute_title',
[
'type' => 'text',
'input' => 'text',
'label' => 'Attribute Title',
'required' => false,
'visible' => true,
'user_defined' => false,
'sort_order' => 1000,
'position' => 1000,
'system' => 0,
]
);
$attribute_title = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'attribute_title')
->addData(
['used_in_forms' => ['adminhtml_customer']
]);
$attribute_title->save();
//Add field Drop Down for Yes/No
$customerSetup->addAttribute(
\Magento\Customer\Model\Customer::ENTITY,
'is_attribute',
[
'type' => 'int',
'input' => 'select',
'label' => 'Is Attribute',
'frontend' => '',
'default' => '1',
'class' => '',
'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Boolean',
'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
'required' => false,
'visible' => true,
'user_defined' => false,
'sort_order' => 1000,
'position' => 1000,
'system' => 0,
]
);
$is_attribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'is_attribute')
->addData(
['used_in_forms' => ['adminhtml_customer']
]);
$is_attribute->save();
// For Date And Time field
$customerSetup->addAttribute(
\Magento\Customer\Model\Customer::ENTITY,
'custom_date',
[
'label' => 'Custom Date',
'type' => 'datetime',
'input' => 'date',
'frontend' => 'Magento\Eav\Model\Entity\Attribute\Frontend\Datetime',
'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\Datetime',
'validate_rules' => '{"input_validation":"date"}',
'user_defined' => false,
'required' => false,
'visible' => true,
'searchable' => false,
'filterable' => false,
'comparable' => false,
'visible_on_front' => false,
'sort_order' => 1000,
'position' => 1000,
'system' => 0,
]
);
$custom_date = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'custom_date')
->addData(
['used_in_forms' => ['adminhtml_customer']
]);
// more used_in_forms ['adminhtml_checkout','adminhtml_customer','adminhtml_customer_address','customer_account_edit','customer_address_edit','customer_register_address']
$commenced_business->save();
}
}
}

Answer 2

Data save will not happen by itself you need to set data into attribute.
If its part of customer Interface
For example
$attribute = $customer->getCustomAttribute('client_dn');
if ($attribute)
{
$customer->setValue("hi");
}
if you are saving using customer object
$customer->setData('client_dn', 'Hi');