django custom field validation code example

Example 1: validationerror django params

raise ValidationError(
    _('Invalid value: %(value)s'),
    code='invalid',
    params={'value': '42'},
)

# Multiple validation errors
raise ValidationError([
    ValidationError(_('Error 1'), code='error1'),
    ValidationError(_('Error 2'), code='error2'),
])

Example 2: django form custom validation

# Good
ValidationError(_('Invalid value'), code='invalid')

# Bad
ValidationError(_('Invalid value'))