Extension talk:Cargo

Looking for a way around duplicate rows
I have the infamous duplicate rows bug. Fortunately, this isn't actually much of a problem most of the time, since I can just add "|group by=_pageID" to most Cargo DB queries and then it will just return distinct rows from the database, even if they are actually doubled in the database. However, I have not yet found a way around the duplicate row problem when I query an aggregate function like SUM or COUNT. In particular, I am trying to do something like this:

Unfortunately, I can't just tack "|group by=_pageID" onto the cargo_query, since that causes the aggregate function SUM to work on a per-group basis (i.e., instead of returning a single row containing the total sum of the Bronze column, it returns many rows, and each row tells me the sum of Bronzes with that particular _pageID is in the database). This wouldn't be a problem if subqueries were possible or something like that, but I haven't been able to find a Cargo-friendly way of grouping by _pageID and then counting/summing the resulting rows. Any thoughts? Thanks in advance! NathanielJ (talk) 17:22, 12 October 2017 (UTC)


 * I was running into this problem the other day. No solution, but one thing I'm thinking about is putting a unique index on all user-facing columns, to prevent the dupes from ever being saved. I'm not sure if that'd just make Cargo fail to insert in a ugly way though. It mightn't be too hard to add  to the insert queries; seems like something Cargo might already do anyway, I'm not familiar with the code. Sam Wilson 22:44, 12 October 2017 (UTC)


 * I was actually going to write a totally different reply - explaining that these are not good options, the best solution is to just use the command-line option for now, etc., when Sam Wilson's suggested solution made me realize that there's a very reasonable solution for this problem that I had been neglecting until now. The code can simply check, before adding a new row to a table, whether a row already exists with that exact same set of data, and then stop adding that row if there is one. I had thought about that solution various times before, but had always rejected it because there can in fact be valid duplicates - a page can have multiple, identical calls to a template, for various reasons. However, I've never heard of this actually happening, and conversely, unwanted data duplication has been a major problem. So I just added this check to the code - in the current Cargo code, a row that looks like a duplicate will simply not get saved. Hopefully there's a nicer long-term fix, but for now, the issue of data duplication may be over! If duplication is a problem for anyone, please try out the latest code. If it seems to work, I'll probably release a new Cargo version soon. Yaron Koren (talk) 16:00, 13 October 2017 (UTC)


 * If anyone's reading this - there was actually a bug in that fix, which I think I just fixed, so if you try to use this new feature, please make sure to get the very latest version. Yaron Koren (talk) 21:41, 20 October 2017 (UTC)

Links/images sometimes displaying as plaintext
I've read through the archives and didn't see a similar issue, so hopefully haven't missed something obvious. I'm using the following query to generate rows:

The template being used to format it includes icon images. Half the time this will display on the page as intended, but on occasion it just breaks and just shows the HTML instead:

 Ac 10% Up

It usually rights itself if I modify the query in some way and resave the page. I'm not really sure what's causing it. Any help would be appreciated. --Rurikawa (talk) 13:40, 13 October 2017 (UTC)


 * Is it the same images that fail, or is it a different set every time? And if it's the same images, does there seem to be any pattern to which images fail? Yaron Koren (talk) 16:01, 13 October 2017 (UTC)


 * It's all of the images at once. There doesn't seem to be a pattern. It happens with another similar query elsewhere as well. Rurikawa (talk) 06:38, 14 October 2017 (UTC)


 * For what it's worth, this happens on my wiki as well, and it's not limited to images --- it happens with any HTML thatis created by format=template. I believe that it may be some kind of conflict with Extension:ConfirmEdit (do you have it installed?), and purging the page's cache seems to fix the issue. NathanielJ (talk) 02:36, 20 October 2017 (UTC)

Cargo query error
After making new templates and changing truckloads of pages, I'm finally ready to start connecting some of the data with Cargo. However, I ran into a snag, and wonder if this is due to running Cargo 1.3.1, a silly error on my part (I'm learning as I go), or something else. Could somebody please elaborate?

This is the test query I'm trying out. Quest_poe1.location is a List of Page

This yields a rather long error message: https://i.imgur.com/ABlUVBV.png

(These are the Cargo tables) —Pangaearocks (talk) 16:54, 15 October 2017 (UTC)


 * You just need to put a table name before "_pageName" in "fields=" - both tables have a "_pageName" field, so the query doesn't know which one to use. Yaron Koren (talk) 03:28, 16 October 2017 (UTC)


 * Thanks. That got me another error, so I must be doing something wrong somewhere. Have attempted so many different things, but this looks right to me? Yet I'm told . Quest_poe1.location is a list field.


 * In a different attempt I tried join on with HOLDS, which yielded another error message. The info here is correct I assume? HOLDS example —Pangaearocks (talk) 05:35, 16 October 2017 (UTC)


 * Yes - given that "location" is a list, it needs to be "join on=Quest_poe1.location HOLDS Location._pageName". Yaron Koren (talk) 13:24, 16 October 2017 (UTC)


 * Thank you - that helped and got rid of the errors :) We have run into another one, though, which is a strange one. When running a query, we get many more rows than should be there. There are hits on pages that don't contain the data we are searching for in the query. I've been in touch with another admin who knows and works with SQL, and we've run different sorts of queries on different tables. He suggests it might be a caching issue. Are there any settings that might cause this, and which we can change so that queries yield the right results immediately? We've resorted to force refreshing pages, which has got rid of some of the many duplicates an erroneous hits.


 * Running the above code (with your fix), here is an example of the hits we get, on this test page. Many of these have nothing to do with "Caed Nua", and others don't have any location set yet. Another example was getting all 5 rows when searching for 'Iron' on Nation.products, which also is a list field, using HOLDS. —Pangaearocks (talk) 19:43, 16 October 2017 (UTC)


 * What's an example of a page that shouldn't be in the results? Yaron Koren (talk) 01:58, 17 October 2017 (UTC)


 * Quite a few actually. For instance His Better Half, Into the White Void, Safe Haven, Songs of the Wild, The Termal Pearl. —Pangaearocks (talk) 15:49, 17 October 2017 (UTC)


 * This looks like a bug with the handling of HOLDS in the "join on" clause. There was a fix for "HOLDS" handling that was done in August, here - I think this was after the version you have. I would recommend upgrading to Cargo 1.4 - and ideally to the very latest code, which contains a possible fix for the duplicates problem - to see if that solves your problem. Yaron Koren (talk) 01:46, 18 October 2017 (UTC)


 * Thanks for confirming this was due to a bug (we're on the 1.3.1 version). As the wiki is located on a wiki farm (Gamepedia), I can't update extensions myself, but the good news is they'll update to Cargo 1.4.0 in the near future, so that should get rid of the HOLDS query issue. That is great news, because it means I can start connecting data on pages from multiple tables. The most recent commit won't be included, but another version of Cargo is released, I hope they can roll out that update too in the near future. Sounds like a good workaround for the duplicate rows issue, which could help a great deal of people :) At least right now, we have a bigger problem with tables not filling out properly, so if you manage to find a fix for that too, it would be great. —Pangaearocks (talk) 20:02, 19 October 2017 (UTC)

How to fill the table for calendar display?
Hi, I have just started with Mediawiki and one of the basic functionality I'd like to have is calendar displayed on my main page. So I installed Cargo with external mysql database, I created simple template:

To jest szablon „Urlopy”. Powinien zostać wywołany w następującym formacie:

 // Here it was with one / but I wasn't able to paste it here correctly with it. Edytuj stronę, aby zobaczyć tekst szablonu.

I see the table is created, but I can't figure out how to add data into it. Could you please help? Daniel


 * Now you just need to create pages that call the "Urlopy" template - you can do it hand, or set up forms to do it using Page Forms, or do a mass creation from a file using Data Transfer. Yaron Koren (talk) 13:11, 18 October 2017 (UTC)


 * Working perfectly. Thank you! Daniel

fullcalendar.io locale change
Hi, is it possible to change fullcalendar.io locale? I know it can be done (according to the fullcalendar documentation:  ), but I have no idea how to apply it in Cargo.


 * I'm amazed to see that all of the "calendar" format display is hardcoded in English! I thought at least some of it was getting translated, but I guess not. I'll have to look into this. Yaron Koren (talk) 17:34, 20 October 2017 (UTC)

Performance testing
Regarding this test, which was apparently run over two years ago: Performance testing Has other more recent tests been carried out, comparing SMW and Cargo, maybe on a larger scale as well? It would be interesting to know more about the speed and resource differences between the two setups. —Pangaearocks (talk) 19:53, 19 October 2017 (UTC)


 * Yes - that test was run a while ago, and now it can't even be re-run, because that wiki no longer has SMW installed on it. I'm not aware of any other performance tests. Yaron Koren (talk) 17:35, 20 October 2017 (UTC)

When do tables need to be re-created?
Figured it was best to put this in a separate 'thread'. As I'm busy converting templates from using SMW (or often nothing) to Cargo, fields may need changes along the way, as I discover the template isn't quite ideal. For instance changing a field from Page to List of Page. Or more simple changes like auto-categorisation, or formatting different things in the infobox.

How serious must the changes be to require a re-creation of the Cargo table itself? Is Cargo able to spot slight changes to the template and update the fields and data accordingly, or should we recreate the table if there have been any changes to the cargo_declare or cargo_store sections? —Pangaearocks (talk) 20:10, 19 October 2017 (UTC)


 * I think only changes to #cargo_declare require recreating the data - if only #cargo_store is changed, I think just the template re-save will trigger all the pages' data to get refreshed. I could be wrong about that, though. But yes, any change to #cargo_declare that would cause the DB table schema to be modified requires a recreate. Yaron Koren (talk) 17:38, 20 October 2017 (UTC)