Product Template Has One Variant

This module extends the product template model (product.template) with a new stored, indexed boolean field called has_one_variant. The value is computed automatically: it is true when the product template has exactly one product variant, and false in all other cases (no variants or more than one variant). Because the field is stored, it can be used in searches and filters without recalculating each time.

In the Products search view, a new filter named 'Has One Variant' is added right after the existing 'Consumable' filter. Users can select it to show only products that have a single variant.

• Automatic rule: the flag updates whenever the list of variants of a product changes.
• Where it appears: Products search view, as a filter option.
• Models touched: product.template only.

No menus, buttons, reports, emails or scheduled actions are added by this module. It is a small utility that helps identify simple products (one variant) versus products with multiple variants, for example to review or filter the product catalogue.