Question: i have a problem to generate downloadable export to csv file, does anyone know the problem? this is my transient model  class ReportPatientWizard(models.TransientModel): _name = "report.patient.wizard" _description = "Patient Reports" patient_id = fields.Many2one('hospital.patient', string='Patient', readonly=True) gender_filter = fields.Selection([('male', 'Male'), ('female', 'Female'), ('other', 'Other')], string='Gender Filter') def _prepare_csv_data(self, patients): field_names = ['Name', 'Age', 'Gender'] # Field names for CSV headers data = io.StringIO() writer = csv.DictWriter(data, fieldnames=field_names) writer.writeheader() # Write CSV header for patient in patients: row = { 'Name': patient.name, 'Age': patient.age, 'Gender': patient.gender, # Add other fields as needed } writer.writerow(row) return data.getvalue() @api.multi def download_patient_report(self): # Ambil data pasien berdasarkan ID yang dipilih patient = self.patient_id # Filter data berdasarkan gender jika gender_filter dipilih if self.gender_filter: patients = self.env['hospital.patient'].search([('gender', '=', self.gender_filter)]) else: patients = self.env['hospital.patient'].search([]) if not patients: raise UserError(_('No patients found matching the criteria.')) csv_data = self._prepare_csv_data(patients) print(f"Records: {patients}") # Prepare file name filename = f'patient_report_{fields.Date.today()}.csv' # Return a response to download the CSV file return { 'type': 'ir.actions.act_url', 'url': 'web/content/?model=report.patient.wizard&id={}&filename={}&field=file'.format(self.id, filename), 'target': 'current', } def print_patient_report(self): # Generate and download patient report as CSV return self.download_patient_report()  and this is the view.xml <record id="report_patient_view" model="ir.ui.view"> <field name="name">Report Patient</field> <field name="model">report.patient.wizard</field> <field name="arch" type="xml"> <form string="Report Patient"> <!-- <field name="patient_id"/>--> <group col="1"> <!-- <field name="is_gender"/>--> <field name="gender_filter"/> </group> <!-- <field name="journal_ids" required="0" invisible="1"/>--> <footer> <button name="download_patient_report" string="Download" type="object" class="oe_highlight"/> <button string="Cancel" class="btn btn-default" special="cancel"/> </footer> </form> </field> </record> <record id="action_report_patient_view" model="ir.actions.act_window"> <field name="name">Report Patient</field> <field name="res_model">report.patient.wizard</field> <field name="type">ir.actions.act_window</field> <field name="view_mode">form</field> <field name="view_id" ref="report_patient_view"/> <field name="target">new</field> </record> <menuitem id="menu_report" name="Report Patients" parent="menu_hospital_operations" action="action_report_patient_view" sequence="15"/>  in here i want to make a form filter that the user can select which gender they want to take the data, but after i clicked the download button it shows the problem this is the error what i was expecting is when i clicked the download button it will generate the download

Answer: You specified a field in the route and you don't have a field named file. You need to add a binary field and set its content just after the file name Example: # Prepare file name filename = f'patient_report_{fields.Date.today()}.csv' self.file = base64.b64encode(csv_data.encode('utf-8'))  You can add self.ensure_one() at the beginning of the download_patient_report function to make sure that self holds a single record