How can save custom attribute value from product_form.xml Magento 2

Question

Add new attribute in product create page in admin side

How can I save value from this dropdown?

here is my product_form.xml

<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
 <fieldset name="product-details">
 <field name="featured_category_ids" sortOrder="100" formElement="select" component="Magento_Ui/js/form/element/ui-select">
 <argument name="data" xsi:type="array">
 <item name="config" xsi:type="array">
 <item name="filterOptions" xsi:type="boolean">true</item>
 <item name="showCheckbox" xsi:type="boolean">true</item>
 <item name="disableLabel" xsi:type="boolean">true</item>
 <item name="multiple" xsi:type="boolean">true</item>
 <item name="levelsVisibility" xsi:type="number">1</item>
 <item name="listens" xsi:type="array">
 <item name="${ $.namespace }.${ $.namespace }:responseData" xsi:type="string">setParsed</item>
 </item>
 </item>
 </argument>
 <settings>
 <label translate="true">Featured Categories</label>
 <dataType>text</dataType>
 <elementTmpl>ui/grid/filters/elements/ui-select</elementTmpl>
 </settings>
 <formElements>
 <select>
 <settings>
 <options class="Magento\Catalog\Ui\Component\Product\Form\Categories\Options"/>
 </settings>
 </select>
 </formElements>
 </field>
 </fieldset>
</form>

• Dhiren Vasoya: how you create this attribute?
• NoOn: add this product_form.xml file in my module and its are visible in adminside but value not save
• Dhiren Vasoya: You need to just create the product attribute using magento methods only and assign that attributeset, rest things is manage by magneto it self.
• NoOn: can you sow me working example? or something like that?

Answer 1

You will need to create a product attribute and add it to the product's attribute set first.

Then, reference the attribute ID in your field dataScope like so:

 <field name="attribute_id" formElement="select">
 <settings>
 <dataScope>attribute_id</dataScope>
 <imports>
 <link name="linkedValue">${$.provider}:data.product.attribute_id</link>
 </imports>
 </settings>
 </field>

If the two IDs match, Magento will save the value.

Answer 2

should be hidden or visible? can you leave a more complete code for creating product_form.xml fields through and creating and saving an attribute? My code which doesn't save or output attribute

<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
 <fieldset name="product_duo" sortOrder="6">
 <settings>
 <label translate="true">Duo</label>
 <collapsible>true</collapsible>
 <opened>true</opened>
 <dataScope>product_duo</dataScope>
 </settings>
 <field name="duo_product" formElement="input" sortOrder="10">
 <settings>
 <visible>true</visible>
 <elementTmpl>ui/form/element/input</elementTmpl>
 <label translate="true">Duo product</label>
 <dataScope>duo_product</dataScope>
 <imports>
 <link name="linkedValue">${$.provider}:data.product.duo_product</link>
 </imports>
 </settings>
 </field>
 </fieldset>
</form>
$eavSetup->addAttribute(
 Product::ENTITY,
 'duo_product',
 [
 'type' => 'varchar',
 'backend' => '',
 'frontend' => '',
 'label' => __('Duo product'),
 'input' => 'hidden',
 'class' => '',
 'source' => '',
 'global' => ScopedAttributeInterface::SCOPE_STORE,
 'visible' => true,
 'required' => false,
 'user_defined' => false,
 'default' => '',
 'searchable' => false,
 'filterable' => false,
 'comparable' => false,
 'visible_on_front' => false,
 'unique' => false,
 'apply_to' => '',
 'is_configurable' => false,
 ]