Add pseudo child-tickets and a visual reference to these within a parent ticket


This plugin modifies the ticket description box and adds a child ticket listing table and a 'create' button for adding new child tickets.

Having child-tickets is useful when multiple releases need to be managed. For example for a single 'bug-report' ticket and a single 'bug-fix' ticket for each milestone/branch of development, for managing sub-tasks of an issue and for managing 'bug-fixes' required when developing a new (larger) enhancement.

It is possible to control in trac.ini the following aspects of child-ticket creation/viewing:

  • allow/disallow child-tickets for a certain type of ticket
  • define the table headers displayed in the parent ticket
  • define a default for the child type to be created / restrict the type of child-tickets
  • define which fields are inherited by child-tickets

This and other examples of this plugin can be found here.


Some time ago I came across the problem of how to manage child tickets in a meaningful fashion, we were using coderanger's original MasterTicketsPlugin and it was great until we started to allow tickets to be viewed and created by people outside of our immediate development group. We found that people who were not familiar with our processes would simply create child tickets of the wrong 'type' and needed some help in getting it right. In addition, users found that the lack of visual information (ie. what are this tickets child tickets?) was also a hindrance.

Under Trac 0.10 I had to modify the ticket.html templates to get this working in any 'pretty' sense so I have not provided support for 0.10. As of 0.11, the ITemplateStreamFilter allows this to be incorporated nicely into a neat plugin.

To keep the plugin compact and simple and to allow future compatibility with different CSS schemes, I have simply 'pinched' the existing CSS classes for generating the table and its components.

Note: The configurability of this plugin has been ported to the SubticketsPlugin. See the patches in issues 9-12 at github. -- Chris Nelson

Bugs/Feature Requests

Existing bugs and feature requests for ChildTicketsPlugin are here.

If you have any issues, create a new ticket.


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Download the zipped source from here.


You can check out ChildTicketsPlugin from here using Subversion, or browse the source with Trac.


General instructions on installing Trac plugins can be found on the TracPlugins page.


The plugin makes use of the 'ticket-custom' field and so requires no extra database tables to be created. The following fields are required in the trac.ini file:

childtickets.* = enabled

parent = text
parent.format = wiki
parent.label = Parent ID

# 'enhancements': child tickets will typically be bug-fix tickets with the same milestone, component and keywords.
parent.enhancement.allow_child_tickets = true
parent.enhancement.new_child_ticket_label = New Enhancement
parent.enhancement.restrict_child_type = bug-fix, task
parent.enhancement.table_headers = type, status, owner, summary
parent.enhancement.inherit = milestone, component, keywords

# 'bug-report': child tickets will typically be bug-fix
parent.bug-report.allow_child_tickets = true
parent.bug-report.default_child_type = bug-fix
parent.bug-report.table_headers = type, priority, owner, summary, milestone
parent.bug-report.inherit = component, keywords

# 'issue': child tickets will typically be task tickets with no default milestone.
parent.issue.allow_child_tickets = true
parent.issue.restrict_child_type = task
parent.issue.table_headers = type, status, owner, summary, milestone

# 'bug-fix': child tickets are not allowed.
parent.bug-fix.allow_child_tickets = false

# 'task': child tickets are not allowed.
parent.task.allow_child_tickets = false

See table below for a generic description of the options.


FieldDescriptionDefault value
parent.parent-type.allow_child_tickets Define whether child tickets are allowed or not False
parent.parent-type.table_headers List of column headers for display in parent ticket summary, owner
parent.parent-type.default_child_type Default child type See [ticket] section of trac.ini (default_type)
parent.parent-type.restrict_child_type A list of possible child types, trying to create a child of a different 'type' will create an error. As of version 1.1.0, if this option is used, a list of submit buttons will be rendered allowing the user to decide which type of child ticket he/she wants to create. None
parent.parent-type.inherit Define a list of inherited fields. Default: None
default.max_depth Limit the creation of too deep a hierarchy. 5

Known Issues / Caveats

  • If you change the behaviour of the parent type (using for example allow_child_tickets/restrict_child_type) and tickets already have child tickets assigned to them, you will not receive a warning about any possible conflicts until you try and modify any of the child tickets.
  • If a parent ticket is restricted in some way that no further child tickets can be generated for that ticket 'type', you'll continue to see a list of child tickets but the 'Create' button will be missing.
  • The 'parent.<type>.inherit' option ensures fields are inherited by child tickets. However, all child tickets regardless of type as defined by 'restrict_child_type' will inherit these values.

Recent Changes

17866 by rjollos on 2020-10-17 16:30:39
Tracchildtickets 2.5.6dev: Require Genshi

This is needed until the templates are ported
to Jinja2.

Refs #13895.

17497 by rjollos on 2019-09-12 17:33:41
Tracchildtickets 2.5.6dev: Format ticket owner in table

Fixes #13607.

17496 by rjollos on 2019-09-12 17:18:13
Tracchildtickets 2.5.6dev: Format code


Author: walnut
Maintainer: Mark Ryan

Last modified 2 years ago Last modified on Jan 4, 2019, 8:00:13 PM

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