Version 3 (modified by trac, 8 years 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 filters will display all open tickets, or if you're logged in it will display open tickets assigned to you. Current filters can be removed by clicking the button to the right with the minus sign on the label. New filters are added from the pulldown list in the bottom-right corner of the filters box. 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

While Trac does not yet allow saving a named query and somehow making it available in a navigable list, you can save references to queries in Wiki content, as described below.

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.

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 using 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 10582)

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Ticket Resolution Summary Owner Reporter
#14518 duplicate GHC panic when trying to install Stack-1.5.1 with Cabal. adgalad

cabal: Entering directory '/var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/cabal-tmp-2256/stack-1.5.1'

[1 of 1] Compiling Main ( /var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/cabal-tmp-2256/stack-1.5.1/dist/setup/setup.hs, /var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/cabal-tmp-2256/stack-1.5.1/dist/setup/Main.o )

Linking /var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/cabal-tmp-2256/stack-1.5.1/dist/setup/setup ...

Configuring stack-1.5.1...

Building stack-1.5.1...

Preprocessing library stack-1.5.1...

[ 1 of 128] Compiling Text.PrettyPrint.Leijen.Extended ( src/Text/PrettyPrint/Leijen/Extended.hs, dist/build/Text/PrettyPrint/Leijen/Extended.o )

[ 2 of 128] Compiling Hackage.Security.Client.Repository.HttpLib.HttpClient ( src/Hackage/Security/Client/Repository/HttpLib/HttpClient.hs, dist/build/Hackage/Security/Client/Repository/HttpLib/HttpClient.o )

[ 3 of 128] Compiling Stack.Ghci.Script ( src/Stack/Ghci/Script.hs, dist/build/Stack/Ghci/Script.o )

[ 4 of 128] Compiling Stack.FileWatch ( src/Stack/FileWatch.hs, dist/build/Stack/FileWatch.o )

[ 5 of 128] Compiling System.Process.PagerEditor ( src/System/Process/PagerEditor.hs, dist/build/System/Process/PagerEditor.o )

[ 6 of 128] Compiling System.Process.Log ( src/System/Process/Log.hs, dist/build/System/Process/Log.o )

[ 7 of 128] Compiling Stack.Types.StringError ( src/Stack/Types/StringError.hs, dist/build/Stack/Types/StringError.o )

[ 8 of 128] Compiling Paths_stack ( dist/build/autogen/Paths_stack.hs, dist/build/Paths_stack.o )

[ 9 of 128] Compiling Path.Find ( src/Path/Find.hs, dist/build/Path/Find.o )

[ 10 of 128] Compiling Path.Extra ( src/Path/Extra.hs, dist/build/Path/Extra.o )

[ 11 of 128] Compiling System.Process.Read ( src/System/Process/Read.hs, dist/build/System/Process/Read.o )

ghc: panic! (the 'impossible' happened)

(GHC version 7.10.3 for x86_64-apple-darwin):

Loading temp shared object failed: dlopen(/var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/ghc2807_0/libghc_69.dylib, 5): no suitable image found. Did find: /var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/ghc2807_0/libghc_69.dylib: malformed mach-o: load commands size (41168) > 32768 /var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/ghc2807_0/libghc_69.dylib: stat() failed with errno=25

Please report this as a GHC bug:

cabal: Leaving directory '/var/folders/6v/r_hy_wrs5bbfnb4qc4ycxfpw0000gn/T/cabal-tmp-2256/stack-1.5.1'

#14517 duplicate ghc: panic! (the 'impossible' happened) KtorZ

Apparently not so impossible. I am just filling a bug following the advice of GHC.

Here's the error message coming out of GHC

ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.2 for x86_64-unknown-linux):
	initTc: unsolved constraints
  WC {wc_insol =
        [W] liftIO_a2jc :: t_a2jb[tau:1] (CHoleCan: liftIO)
        [W] handleMsg_a2k6 :: t_a2k5[tau:1] (CHoleCan: handleMsg)
        [W] expectTimeout_a2kb :: t_a2ka[tau:1] (CHoleCan: expectTimeout)
        [W] sendMsg_a2v9 :: t_a2v8[tau:1] (CHoleCan: sendMsg)
        [W] tick_a2vc :: t_a2vb[tau:1] (CHoleCan: tick)}

Please report this as a GHC bug:

And here the corresponding code that leads to this compilation error:

module Main where

import           Control.Distributed.Process (NodeId (..), Process)
import           Control.Monad               (forever)
import           Data.IORef                  (IORef, newIORef)

type Clock =

emitRandomNumbers :: [NodeId] -> Process ()
emitRandomNumbers nodes = do
  clock <-
    liftIO $ newIORef (0 :: Clock)

  forever $ do
    msg <-
      handleMsg <$> expectTimeout 0

    sendMsg <$> tick

I am compiling on with GHC 8.0.2 on Ubuntu 16.04, here are a list of the install dependencies:

distributed-process 0.7.3
distributed-static 0.3.8
exceptions 0.8.3
ghc-boot-th 8.0.2
mtl 2.2.1
network-transport-tcp 0.5.1
random 1.1
rts 1.0
syb 0.7

Let me know should you need any additional informations.

#14514 invalid Higher-Rank Kinds work in ADT but not GADT Iceland_jack

Following code from Richard's 2016 Haskell Implementors' Workshop talk (/ Trees That Grow) works just fine

{-# Language RankNTypes, KindSignatures, DataKinds, TypeFamilyDependencies, TypeInType #-}

import Data.Kind

data TagTag = ETagTag | PTagTag
data ETag   = VarTag
data PTag   = VarPTag

type family
  Tag (ttag::TagTag) = (res :: Type) | res -> ttag where
  Tag ETagTag = ETag
  Tag PTagTag = PTag

type WithAnyTag = forall tag. Tag tag -> Type

-- data Exp (ext::WithAnyTag) where
--   Var :: ext VarTag -> Exp ext
data Exp (ext::WithAnyTag) = Var (ext VarTag)

but replace data Exp with its commented-out GADT brethren and it stops working

$ ghci -ignore-dot-ghci Weird.hs 
GHCi, version 8.2.1:  :? for help
[1 of 1] Compiling Main             ( Weird.hs, interpreted )

Weird.hs:17:28: error:
    • Expected kind ‘WithAnyTag’, but ‘ext1’ has kind ‘ETag -> *’
    • In the first argument of ‘Exp’, namely ‘ext’
      In the type ‘Exp ext’
      In the definition of data constructor ‘Var’
17 |   Var :: ext VarTag -> Exp ext
   |                            ^^^
Failed, 0 modules loaded.

The type synonym can be inlined, makes no difference.

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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.

The available operators are:

= the field content exactly matches the 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

See also: TracTickets, TracReports, TracGuide