Hello Odoo community,

I created a wizard which has 2 fields start date and end date, with in the wizard user can choose the date and im trying to use that date value to filter invoice report but for some reason i cant retrieve my start date from the wizard it comes as empty all the time. Any suggestion or any ideas what im doing wrong

Code example

from openerp import fields,api
from openerp.osv import orm


class post_invoice_wizard(orm.TransientModel):
    _name = 'post.invoice.wizard'
    start_date = fields.Date('Start Date')
    end_date = fields.Date('End Date')
    
    @api.model
    def _post_invoice_ids(self):
        for rec in self:
            post_invoice_ids=self.env['posted.invoice.report'].search([('date_invoice', '>=', rec.start_date)]) 
            return post_invoice_ids