diff options
Diffstat (limited to 'docs/design-api')
| -rw-r--r-- | docs/design-api | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/design-api b/docs/design-api index 6e483b9..c0af5d5 100644 --- a/docs/design-api +++ b/docs/design-api @@ -32,8 +32,10 @@ Object API backend has custom attributes, you will need to override this method. If no other arguments besides ATTRIBUTE are given, returns the values - of that attribute, if any, as a list. On error, returns a list - containing one undefined element; (undef), in other words. + of that attribute, if any, as a list. To distinguish between the + empty attribute list and an error, be sure to undefine $self->{error} + at the start of the method and only set the error on failure so that + the caller can call error() to determine if there was a a failure. If other arguments are given, sets the given ATTRIBUTE values to VALUES, which must be a reference to an array (even if only one value |