diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/howto/custom-template-tags.txt | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/docs/howto/custom-template-tags.txt b/docs/howto/custom-template-tags.txt index f07ae6112f..f26fa34af9 100644 --- a/docs/howto/custom-template-tags.txt +++ b/docs/howto/custom-template-tags.txt @@ -88,9 +88,11 @@ Custom filters are just Python functions that take one or two arguments: For example, in the filter ``{{ var|foo:"bar" }}``, the filter ``foo`` would be passed the variable ``var`` and the argument ``"bar"``. -Filter functions should always return something. They shouldn't raise -exceptions. They should fail silently. In case of error, they should return -either the original input or an empty string -- whichever makes more sense. +Usually any exception raised from a template filter will be exposed as a server +error. Thus, filter functions should avoid raising exceptions if there is a +reasonable fallback value to return. In case of input that represents a clear +bug in a template, raising an exception may still be better than silent failure +which hides the bug. Here's an example filter definition: |