Reporting errors to the user

During method execution, it is sometimes necessary to abort the processing because an error condition was met. This recipe shows how to do this so that a helpful error message is displayed to the user when a method which writes a file to disk encounters an error.

Getting ready

To use this recipe, you need a method, which can have an abnormal condition. We will use the following one:

import os
from openerp import models, fields, api

class SomeModel(models.Model):
    data = fields.Text('Data')

    @api.multi
    def save(self, filename):
        path = os.path.join('/opt/exports', filename)
        with open(path, 'w') as fobj:
            for record in self:
                fobj.write(record.data)
                fobj.write('\n')

This method can fail because of permission issues, or a full disk, or an illegal name, which would cause an IOError or an OSError exception to be raised.

How to do it…

To display an error message to the user when an error condition is encountered...