I'm trying to run a scheduled task on Odoo v8. The task is started correctly without any problem, but the cron method is called using the legacy API.

That means I need to always pass the cr, uid, context vars when calling a method. It also means I don't have access to certains var such as self.env, self,._ds, ...

How does someone create a scheduled task and call it with the new API (v8)?

Here is the cron record

<record id="ir_cron_generate_periodic_invoices" model="ir.cron">
    <field name="name">Generate Periodic Invoices from Contract</field>
    <field eval="True" name="active"/>
    <field name="user_id" ref="base.user_root"/>
    <field name="interval_number">1</field>
    <field name="interval_type">days</field>
    <field name="numbercall">-1</field>
    <field name="doall" eval="False"/>
    <field name="model">account.analytic.account</field>
    <field name="function">_cron_periodic_create_invoice</field>
    <field name="args">()</field>
</record>

And here is the object

class account_analytic_account(models.Model):
    _inherit = "account.analytic.account"
    
    def _cron_periodic_create_invoice(self,cr, uid, context=None):
        self._periodic_create_invoice() 

    def _periodic_create_invoice(self):
        # Do something here ...