I have create a template to send payslip email to employee , it woeks when sending one by one but I want to send it to all employee in one shot here is my function:

class sendemail(models.Model):
    _inherit = 'hr.payslip'
    _description = 'to send email to employee'

    def sendemail(self):
        template_id=self.env.ref('salary_reports.payslip_email').id
        self.env['mail.template'].browse(template_id).send_mail(self.id, force_send=True)

    noupdate="1">
        id="payslip_email" model="mail.template">
            name="name">employee: Send by email
            name="model_id" ref="hr_payroll_community.model_hr_payslip"/>
            name="email_from">mgstar091@gmail.com
            name="email_to">${object.employee_id.work_email}
              name="subject">قسيمة مرتب
            name="body_html" type="html">
                
style="margin: 0px; padding: 0px;">
                    
style="margin: 0px; padding: 0px; font-size: 13px;">
                         ${object.employee_id.name}/ السيد
                        


                        نحسل إليكم مرتب شهر
                        ${object.date_to}
                        



                                         تقبل تحياتي
                    

                

            
            name="report_template" ref="your_report_id"/>
            name="report_name">nothing
        

    

it gives me this error 

ValueError: : "Expected singleton: hr.payslip(11, 13)" while evaluating
'records.sendemail()