Version 4 (modified by trac, 22 months ago) (diff)


Trac Ticket Queries

In addition to reports, Trac provides support for custom ticket queries, used to display lists of tickets meeting a specified set of criteria.

To configure and execute a custom query, switch to the View Tickets module from the navigation bar, and select the Custom Query link.


When you first go to the query page the default filter will display tickets relevant to you:

  • If logged in then all open tickets it will display open tickets assigned to you.
  • If not logged in but you have specified a name or email address in the preferences then it will display all open tickets where your email (or name if email not defined) is in the CC list.
  • If not logged and no name/email defined in the preferences then all open issues are displayed.

Current filters can be removed by clicking the button to the left with the minus sign on the label. New filters are added from the pulldown lists at the bottom corners of the filters box ('And' conditions on the left, 'Or' conditions on the right). Filters with either a text box or a pulldown menu of options can be added multiple times to perform an or of the criteria.

You can use the fields just below the filters box to group the results based on a field, or display the full description for each ticket.

Once you've edited your filters click the Update button to refresh your results.

Clicking on one of the query results will take you to that ticket. You can navigate through the results by clicking the Next Ticket or Previous Ticket links just below the main menu bar, or click the Back to Query link to return to the query page.

You can safely edit any of the tickets and continue to navigate through the results using the Next/Previous/Back to Query links after saving your results. When you return to the query any tickets which were edited will be displayed with italicized text. If one of the tickets was edited such that it no longer matches the query criteria the text will also be greyed. Lastly, if a new ticket matching the query criteria has been created, it will be shown in bold.

The query results can be refreshed and cleared of these status indicators by clicking the Update button again.

Saving Queries

Trac allows you to save the query as a named query accessible from the reports module. To save a query ensure that you have Updated the view and then click the Save query button displayed beneath the results. You can also save references to queries in Wiki content, as described below.

Note: one way to easily build queries like the ones below, you can build and test the queries in the Custom report module and when ready - click Save query. This will build the query string for you. All you need to do is remove the extra line breaks.

Note: you must have the REPORT_CREATE permission in order to save queries to the list of default reports. The Save query button will only appear if you are logged in as a user that has been granted this permission. If your account does not have permission to create reports, you can still use the methods below to save a query.

You may want to save some queries so that you can come back to them later. You can do this by making a link to the query from any Wiki page.

[query:status=new|assigned|reopened&version=1.0 Active tickets against 1.0]

Which is displayed as:

Active tickets against 1.0

This uses a very simple query language to specify the criteria (see Query Language).

Alternatively, you can copy the query string of a query and paste that into the Wiki link, including the leading ? character:

[query:?status=new&status=assigned&status=reopened&group=owner Assigned tickets by owner]

Which is displayed as:

Assigned tickets by owner

Using the [[TicketQuery]] Macro

The TicketQuery macro lets you display lists of tickets matching certain criteria anywhere you can use WikiFormatting.



This is displayed as:

No results

Just like the query: wiki links, the parameter of this macro expects a query string formatted according to the rules of the simple ticket query language. This also allows displaying the link and description of a single ticket:


This is displayed as:

Unix manual pages not in release bundles

A more compact representation without the ticket summaries is also available:

[[TicketQuery(version=0.6|0.7&resolution=duplicate, compact)]]

This is displayed as:

No results

Finally, if you wish to receive only the number of defects that match the query, use the count parameter.

[[TicketQuery(version=0.6|0.7&resolution=duplicate, count)]]

This is displayed as:


Customizing the table format

You can also customize the columns displayed in the table format (format=table) by using col=<field> - you can specify multiple fields and what order they are displayed by placing pipes (|) between the columns like below:


This is displayed as:

Full rows

In table format you can also have full rows by using rows=<field> like below:


This is displayed as:

Results (1 - 3 of 7652)

1 2 3 4 5 6 7 8 9 10 11
Ticket Resolution Summary Owner Reporter
#10364 wontfix Feature request: Add support for FMA ekmett lerkok

FMA (fused-multiply-add) has been around for quite some-time, and is natively supported by many of the newer processors. It's an operation that is heavily used in HPC applications. I think it's time for Haskell to have native support for it as well.

Ideally, it should be added to the Num class as a method. Assuming that is a possibility, we would have the following signature and default definition:

class Num a where
   fma :: a -> a -> a -> a
   fma x y z = x * y + z

Except of course the Float and Double instances would ensure that the rounding is done only once.

If adding it to the Num class is not an option, then RealFloat class would be the next best place; and perhaps that's arguably also a better place because those types are the ones one usually has in mind when using FMA.

I think either Num or RealFloat would be fine choices.


  • If the underlying architecture supports it (which is very common), directly emit FMA instruction
  • Otherwise, FFI out to C and use fma and fmaf from the math library

A direct software implementation might also be possible for platforms where neither choice above is an option, but that bridge can be crossed when we get there.

As a final note; while supporting these functions might seem going-out-of-our-way; it is indeed a big selling point in HPC applications. Furthermore, hardware manufacturers are putting big resources to make these supported natively in the instruction sets. Supporting FMA right out of the box would be a very good step in wider adaptation of Haskell in the HPC community.

#10356 duplicate Couldn't match type ‘a’ with ‘Int’ / ‘a’ is untouchable / inside the constraints () radix

Sadly I'm a Haskell newbie, so this won't be a very good bug report, but I am working on a codebase and I triggered a GHC bug (at least according to GHC itself).

Building json-log-viewer-0.0.1...
Preprocessing executable 'json-log-viewer' for json-log-viewer-0.0.1...
[3 of 3] Compiling Main             ( src/Main.hs, dist/build/json-log-viewer/json-log-viewer-tmp/Main.o )

    Couldn't match type ‘a’ with ‘Int’
      ‘a’ is untouchable
        inside the constraints ()
        bound by the inferred type of refreshMessages :: IO ()
        at src/Main.hs:(300,7)-(324,48)ghc: panic! (the 'impossible' happened)
  (GHC version 7.10.1 for x86_64-apple-darwin):
	No skolem info: a_al2w[sk]

Please report this as a GHC bug:

I saved the state of the code in a git branch and put it here:

I'll also attach my list of cabal dependencies installed. The only tricky one is that I'm working off of an unreleased version of vty-ui, at this revision:

I also don't know if the program is "valid" -- I'm in the middle of a refactor, and it's a big cluttered program that I know is very poorly written. Sorry about that. I would not usually report a bug in such a situation but the compiler implored me to, so I am.

#10351 fixed Inferred type is rejected simonpj


class C a where
 op :: a -> ()

f x = op [x]

we get

Foo.hs:14:1: error:
    Non type-variable argument in the constraint: C [t]
    (Use FlexibleContexts to permit this)
    When checking that ‘f’ has the inferred type
      f :: forall t. C [t] => t -> ()

Arguably, if FlexibleContexts is not on, we should not infer a type that will immediately be rejected.

1 2 3 4 5 6 7 8 9 10 11

Query Language

query: TracLinks and the [[TicketQuery]] macro both use a mini “query language” for specifying query filters. Basically, the filters are separated by ampersands (&). Each filter then consists of the ticket field name, an operator, and one or more values. More than one value are separated by a pipe (|), meaning that the filter matches any of the values. To include a literal & or | in a value, escape the character with a backslash (\).

The available operators are:

= the field content exactly matches one of the values
~= the field content contains one or more of the values
^= the field content starts with one of the values
$= the field content ends with one of the values

All of these operators can also be negated:

!= the field content matches none of the values
!~= the field content does not contain any of the values
!^= the field content does not start with any of the values
!$= the field content does not end with any of the values

The date fields created and modified can be constrained by using the = operator and specifying a value containing two dates separated by two dots (..). Either end of the date range can be left empty, meaning that the corresponding end of the range is open. The date parser understands a few natural date specifications like "3 weeks ago", "last month" and "now", as well as Bugzilla-style date specifications like "1d", "2w", "3m" or "4y" for 1 day, 2 weeks, 3 months and 4 years, respectively. Spaces in date specifications can be left out to avoid having to quote the query string.

created=2007-01-01..2008-01-01 query tickets created in 2007
created=lastmonth..thismonth query tickets created during the previous month
modified=1weekago.. query tickets that have been modified in the last week
modified=..30daysago query tickets that have been inactive for the last 30 days

See also: TracTickets, TracReports, TracGuide