Product Attribute Value Dependent Mixin

Fields

The mixin exposes the following fields:

• product_tmpl_id: the product template to filter on (optional).
• product_id: a specific product variant (optional).
• attribute_value_ids: a set of attribute values to filter on (optional).
• available_product_domain: a computed domain to restrict the selection of product_id in views, based on product_tmpl_id.
• available_attribute_value_domain: a computed domain to restrict the selection of attribute_value_ids in views, based on product_tmpl_id.

Inheriting the Mixin

To use this mixin, inherit from attribute.value.dependent.mixin in your model alongside your base model:

from odoo import fields, models


class MyModel(models.Model):
    _name = "my.model"
    _inherit = ["my.model", "attribute.value.dependent.mixin"]

All fields from the mixin (product_tmpl_id, product_id, attribute_value_ids, available_product_domain, available_attribute_value_domain) are automatically available on your model.

Using the Domain Fields in a Form View

The computed domain fields must be referenced in the domain attribute of the corresponding fields in the view. Odoo 18.0 automatically loads fields referenced in domain attributes, so no additional declaration is needed.

<record id="view_my_model_form" model="ir.ui.view">
    <field name="name">my.model.form</field>
    <field name="model">my.model</field>
    <field name="arch" type="xml">
        <form>
            <group>
                <field name="product_tmpl_id"/>
                <field name="product_id"
                       domain="available_product_domain"
                       context="{'default_product_tmpl_id': product_tmpl_id}"/>
                <field name="attribute_value_ids"
                       domain="available_attribute_value_domain"
                       widget="many2many_tags"/>
            </group>
        </form>
    </field>
</record>

Matching Logic

The is_matching_product(product) method validates whether a given product variant satisfies the configured constraints. All fields are optional and act as independent filters combined with AND logic:

• If product_id is set, it is the most restrictive criterion: the method returns True only if the given product is exactly that variant, regardless of other fields.
• If product_tmpl_id is set, the given product must belong to that template.
• If attribute_value_ids is set, the given product must match the configured attribute values with the following logic:
• Values belonging to the same attribute are combined with OR (e.g. size S or M).
• Values belonging to different attributes are combined with AND (e.g. size S or M and color Red).
• Since an attribute value can exist across multiple templates, product_tmpl_id and attribute_value_ids should be used together to avoid unintended matches across templates.
• If no field is set, the method returns True for any product (no constraint).

Using is_matching_product

The is_matching_product(product) method can be called from Python code to check whether a given product.product record satisfies the constraints defined on a mixin record:

for rule in self.env["my.model"].search([]):
    if rule.is_matching_product(product):
        # apply rule