You can use URL-Action to send your file, but before that, you need to dump the data into IRAttachment, then use this attachment to download the file via Browser(URL)

A sample snippet as follows: (in my case am writing into an Excel File & returning the same as downloaded)

# Attach & Print: Excel File 
out = base64.encodestring(result_ExcelFile)  
 
attachment = self.env['ir.attachment'].create({
       'name': <file_name>,                    
       'datas': out,                    
       'datas_fname': <file_name>,                    
       'res_model': self._name,                    
       'res_id': self.id,                    
       'type': 'binary'})    
 
base_url = self.env['ir.config_parameter'].get_param('web.base.url')    
 
return {'type' : 'ir.actions.act_url',                
        'url': base_url + '/web/content/%s/%s'%(attachment.id, <file_name>),                
        'target': 'self',            
}

Hi,

"saveas" or "saveas_ajax" python functions are in module web/controllers/main.py in class Binary (but I think you should create yours using what you need in saveas method, because this function use attachment)

(v8) : def saveas(self, model, field, id=None, filename_field=None, **kw):

bye

you can use binary field I think, add a binary field to your model and when you make new csv file, save this file to the binary field. you'll be able then to download it (normally with binary field you'll have upload too.. but if you try to set this field to readonly, then maybe upload will be disabled(?))