Edgewall Software

Duplicate check when filing new tickets

A new duplicate ticket is a new ticket that has been posted before. For the background into the issues surrounding new duplicate tickets, see the following discussions:

Good implementations of checking new duplicate tickets are:

  • Ubuntu LaunchPad. See screenshots below.
  • Stackoverflow. After you type in a question, the area immediately below the title (summary, in Trac) is populated with a list of questions that possibly match based on the text. This would fit into the existing Trac UI fairly easily.

Display an overview, and two links "report bug", "ask question"

bug overview

Show frequently reported bugs, and allow enter title

display most frequently reported bugs

Display possible duplicates, and allow enter bug, or notify security team

display similar tickets out of a search, and allow filing a new one


Here is an idea for a plugin that could be used for doing semi-automated duplicate checking. It is a more automated version of what is described in the MostFrequentDuplicates page, by using the information collected there before new tickets get created.

We could use a bit more structure in that page, for associating patterns to tickets. Examples:

HTMLParseError: bad end tag
Duplicate of
related to a SilverCity bug
PyGIT.py.*cannot concatenate 'str' and 'NoneType' objects
Duplicate of
This is a bug in the TH:GitPlugin for Trac on nonexistent paths, see TH:ticket:2671

Before ticket creation, the ticket description is scanned for the available (multi-line) patterns and if a match is found, a validation warning should be returned (see tags/trac-0.11/trac/ticket/api.py@#L127). This will prevent ticket creation and show a warning which can display the duplicate ticket and the associated note. See also the InterWiki module for hints about retrieving data from a Wiki page.

Last modified 2 years ago Last modified on Apr 9, 2015, 12:13:53 PM

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