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I'm creating Product create / Edit API for admin.

In product edit API some attributes are in custom_attribute section(most of newly create) some are in extension_attribute and remain are directly within attribute code i 'm passing in the payload.

My question when creating Product how can I separate which attributes are within which section.directly,custom_attribute section or within extension_attribute section.because an at a time of product creation I can not separate attributes in section by using attribute set.

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Let's take them step by step:

  • top level attributes (name, sku, price, ...): this are the attributes that have a setter / getter in Magento\Catalog\Api\Data\ProductInterface. But they have to be attributes. For example there is a getter getOptions that gives you the custom options of the product. That one is not an attribute getter.
  • extension attributes: these are entities (or fields) related to the product that you don't store in the main product tables (catalog_product_entity_*). You will find them defined in the extension_attributes.xml files for the entity Magento\Catalog\Api\Data\ProductInterface. If you want to know all of them look in the for the string extension_attributes for="Magento\Catalog\Api\Data\ProductInterface" in all extension_attributes.xml files. You can add one or more yourself following the same procedure.
  • custom attributes. All other product attributes that do not appear in the top level.
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Here is my short answer (I will update later)

For product custom attributes:

  • Those attributes will be added to custom_attributes "automatically". And, they are eav attributes.
  • You can find them in eav_attribute table.
  • is_user_defined is true (1) in eav_attribute.

For product extension attributes, you need:

Product extension attribute is more complicated than custom attribute.

Marius's answer is more clear.

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