from odoo import models, fields, api

class ProductTemplate(models.Model):
    _inherit = 'product.template'

    asset_count = fields.Integer(string='Assets', compute='_compute_asset_count')

    def _compute_asset_count(self):
        # account.asset has product_id which links to product.product
        # We need to count assets for all variants of this template
        for product in self:
            # Domain: product_id.product_tmpl_id = product.id
            product.asset_count = self.env['account.asset'].search_count([
                ('product_id.product_tmpl_id', '=', product.id)
            ])

    def action_view_assets(self):
        self.ensure_one()
        return {
            'name': 'Assets',
            'type': 'ir.actions.act_window',
            'res_model': 'account.asset',
            'view_mode': 'tree,form',
            'domain': [('product_id.product_tmpl_id', '=', self.id)],
            'context': {'default_product_id': self.product_variant_id.id},
        }