[Koha-bugs] [Bug 20930] Handle YAML type system preferences as parsed references

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20930

--- Comment #3 from Lari Taskula <lari.taskula at jns.fi> ---
Created attachment 76384
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=76384&action=edit
Bug 20930: Display human readable errors in preferences page

Displays human readable error when YAML/JSON preference has invalid syntax.

If multiple preferences are modified at the same time, notifies librarian of
the
preferences that were saved and the ones that had errors.

To test:
1. Apply patches
2. Write invalid YAML syntax to OpacHiddenItems system preference
3. Observe "Error; Preference OpacHiddenItems has invalid syntax" error
4. Write valid YAML syntax to OpacHiddenItems system preference
5. Observe "Saved preference OpacHiddenItems" message
6. Test steps 2-5 for both single preference modification and together
   with other system preferences.

---
invalid:
yaml syntax

---
valid:
  yaml: syntax

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