Magento 2 EAV & Attributes

Before writing code

Fetch live docs:

1. Web-search site:developer.adobe.com commerce php development components attributes for attribute development guide
2. Web-search site:developer.adobe.com commerce php tutorials backend custom-attributes for attribute creation tutorial
3. Web-search magento 2 EAV attribute data patch for current patterns using data patches

Conceptual Architecture

What EAV Is

Entity-Attribute-Value is Magento's flexible storage pattern. Instead of one column per attribute, values are stored in separate typed tables. This allows merchants to add unlimited attributes without schema changes.

EAV Entities

Four entity types use EAV:

• Products (catalog_product_entity)
• Categories (catalog_category_entity)
• Customers (customer_entity)
• Customer Addresses (customer_address_entity)

EAV Table Structure

Each entity has typed value tables:

• *_entity — base entity table (entity_id, sku, type_id, etc.)
• *_entity_varchar — short text values
• *_entity_int — integer values (including boolean, select)
• *_entity_decimal — decimal/price values
• *_entity_datetime — date/time values
• *_entity_text — long text values

Attribute Properties

Key properties when creating attributes:

• type — backend storage type (varchar, int, decimal, datetime, text, static)
• input — frontend input type (text, textarea, select, multiselect, boolean, date, price, media_image, etc.)
• label — human-readable name
• required — is this attribute mandatory?
• source — source model for select/multiselect options
• backend — backend model for validation/processing
• frontend — frontend model for display formatting
• global — scope: store view, website, or global
• visible — shown in admin forms
• searchable — indexed for catalog search
• filterable — available as layered navigation filter
• comparable — shown in product comparison
• used_in_product_listing — available in category listing pages

Attribute Sets and Groups

• Attribute Set — a named collection of attributes (e.g., "Default", "Clothing", "Electronics")
• Attribute Group — organizes attributes within a set into tabs (e.g., "General", "Prices", "Images")
• Every product is assigned one attribute set
• The Default attribute set contains core attributes

Creating Attributes via Data Patch

The modern approach uses Data Patches with EavSetupFactory:

1. Create a data patch class in Setup/Patch/Data/
2. Inject EavSetupFactory (or CategorySetupFactory for categories)
3. Call $eavSetup->addAttribute() with entity type, code, and properties
4. Assign to attribute set/group

Source Models

For select/multiselect attributes, source models provide options:

• Built-in: Magento\Eav\Model\Entity\Attribute\Source\Boolean, Table
• Custom: extend AbstractSource, implement getAllOptions()

Static Attributes

Attributes with type static are stored as columns directly on the entity table rather than in EAV value tables. Used for frequently queried fields (e.g., sku, type_id, created_at).

Best Practices

• Use data patches (not install/upgrade scripts) for attribute creation
• Choose the correct backend type — int for select/boolean, decimal for prices
• Set searchable, filterable, comparable thoughtfully — each adds indexing overhead
• Use static type sparingly — it modifies the entity table schema
• Test attribute creation on a clean install and with setup:upgrade

Fetch the attribute development docs for exact addAttribute() parameters, source model patterns, and current entity type constants before implementing.