vertical-cooperative/easy_my_coop/wizard/validate_subscription_request.py

from odoo import api, models


class ValidateSubscriptionRequest(models.TransientModel):
    _name = "validate.subscription.request"
    _description = "Validate subscription request"

    @api.multi
    def validate(self):
        selected_requests = self.env['subscription.request'].browse(
            self._context.get('active_ids'))
        subscription_requests = selected_requests.filtered(
            lambda record: record.state in ['draft', 'waiting'])

        for subscription_request in subscription_requests:
            subscription_request.validate_subscription_request()
        return True