Hello, 
I want to make a modification on hr_holidays module to create a schedule every month to allocate 3 extra days for each employee.

By following this \tutorial I managed to create a single record for each employee which updates itself to add extra 3 days for each employee. Here's my code

class hr_holidays(models.Model):

    _inherit = 'hr.holidays',
    #This function is called when the scheduler goes off
    def process_demo_scheduler_queue(self, cr, uid, context=None):
        scheduler_line_obj = self.pool.get('hr.holidays')
        #Contains all ids for the model hr.holidays
        scheduler_line_ids = self.pool.get('hr.holidays').search(cr, uid, [])   
        #Loops over every record in the model hr.holidays
        for scheduler_line_id in scheduler_line_ids :
        #Contains all details from the record in the variable scheduler_line
            scheduler_line =scheduler_line_obj.browse(cr, uid,scheduler_line_id ,context=context)
        number_of_days_temp = scheduler_line.number_of_days_temp
        state = scheduler_line.state
        #Prints out the name of every record.
        #Update the record
        scheduler_line_obj.write(cr, uid, scheduler_line_id, {'number_of_days_temp': (number_of_days_temp +3), 'state': 'confirm'}, context=context)

cron view:

    <record id="ir_cron_scheduler_hr_holidays" model="ir.cron">
            <field name="name">Leaves scheduler</field>
            <field name="user_id" ref="base.user_root"/>
            <field name="interval_number">1</field>
            <field name="interval_type">months</field>
            <field name="numbercall">-1</field>
            <field eval="False" name="doall"/>
            <field eval="'hr.holidays'" name="model"/>
            <field eval="'process_demo_scheduler_queue'" name="function"/>
        </record>

But what I need is that I want to schedule every month with a new created record ea. each employee will have 12 allocation records in a single year, not only one record which update itself every month.

How to do that?