Introduction
We are ready to start testing the next version of TurboGears: 2.1. This release is the first of what will be a series of alpha and beta releases before we move into production. 2.1 is not a huge departure from the 2.0 codebase, rather, it’s efforts are to clean up and speed up the existing codebase, both conceptually and technically. So, if you have some time, install it today and give it a whirl!
Major Differences (Things that affect present 2.0 users)
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Rendering
The item that will affect most 2.0 users is the renderer.  Json rendering is now not a special hard-coded case, so you will need to add it to your default config. Most 2.0 apps will have to add the following line to their app_cfg.py if you are using @expose(‘json’) at all::
base_config.renderers.append(‘json’)
If you should forget to do this, you will get an error message reminding you to do so.
TurboJson
Support for TurboJson has been removed. We have not found many people using this, and in fact, if you still need it, you can still put it into your TG application. For the most part SimpleJson does a good job of rendering Json for us, and because it is a part of the python default library in 2.6, it makes sense to utilize it. This allowed us to remove about 8 package dependencies.
Minor Differences (Things that affect folks familiar with how TG already works)
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Dispatch
The dispatch mechanism has been completely refactored. This means that pesky things like requiring *args at the end of a RestController.edit are now not required. The new dispatcher is much faster, up to 200% faster for RestController dispatching. It also has the flexibility to add a _dispatch() method to your Controller class to drive the dispatch. This is not yet documented, but it’s on the high priority list for documentation.
Setup-app
Setup-app has been broken into two pieces, schema creation and bootstrapping. This will not affect existing TurboGears apps, but if you were familiar with a certain way quickstart works, this has changed. There are now schema.py and bootstrap.py modules in the websetup directory of your quickstart. These isolate database schema creation from adding bootstrap data to the database. This helps when you are writing scripts that modify a database, but do not add the bootstrap data (useful for testing). Having them in separate modules makes the separation of concerns more apparent.
Catwalk
While the branding was nice, we decided to drop the Catwalk name in order to make it easier to follow tutorials that utilize tgext.admin. Therefore, in quickstarts, you will no longer see catwalk, just tgext.admin calls. This also allowed us to drop yet another dependency. Catwalk will still remain a viable package, but it will no longer be maintained. The good news is that nearly all the functionality for the admin resides withing tgext.admin. Catwalk was simply a configuration of the former.
New Features
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Documentation
A concerted effort has been made to increase the depth, breadth, and organization of the docs. Areas of focus have been: Organization of the docs themselves, Configuration, Tutorials, and Utilities. Part of the 2.1 push will be to get the docs to a level of completion never seen before, and an organized effort is taking place to ensure this aspect of the project’s success.
Mako!!
TurboGears2 has always supported Mako, but we are now providing template support in our quickstart. When you quickstart a new project, it will ask you if you want to use mako templates instead of Genshi. Mako is usually about 3x as fast as Genshi for complex rendered pages, and up to 10x as fast for simple ones. Careful attention has been given the Admin to make sure it still works with Mako (it does), so you can be certain if you make the choice to use mako, it will work out of the box.
local:
In order to handle template inheritance gracefully, an identifier for the local project has been added to the template lookup in Mako. This allows the admin to inherit your local project’s master.mak file. An inhertance clause in Mako that uses local would looks something like::
<%inherit file=”local:templates.master”/>
Genshi has support for this automatically, but it is not explicit, and we are looking at ways to support this explicitly before 2.1 goes to final.
ToscaWidgets2 Support
ToscaWidgets2 recently made a 2.0a1 release. We have included in TurboGears2.1 the ability to easily configure your application for TW2, along with other added support for this next-generation widget framework.
Thanks
=======
This release comes not without considerable effort on the part of the TurboGears team. I would like to thank Michael Pedersen for his undying effort with the docs. Michael helped to collect about 190 todo items for our docs, and squashed a countless number of them. We now have about 130 items todo on the docs, but that number is ever-decreasing with his and other’s effort. Thanks to those folks who have contributed to the DocSprint, and who still continue to contribute, including Michael Fletcher, Jorge Vargas, and Seth Davis. If you use TurboGears, and find you need to dig into the source code to figure stuff out, please help us make the docs better by contributing to a DocSprint or sending us a pull request.
Thanks to Jorge for straightening out the Json rendering issue. Also, by removing TurboJson from the stack of required packages, we have opened the door for TurboGears to run on AppEngine and Jython. This would not be possible without Jorge’s effort.
Thanks also to Mark Ramm, Christopher Ardnt, Florent Aide, Alberto Valverde, Paul Johnston, Christoph Zwerschke, and Lee McFadden for their continued support of TG.
Finally, I just wanted to send a thank you to the folks who have contributed to the TG codebase by association. Mike Bayer, Jason Kirtland, Ben Bangert, Philip Jenvey, Chris McDonough, and last but not least Ian Bicking. Thanks for all of your effort making possible this great conglomeration of parts.
Damn, this sounds cool. Will there be a 2.0 to 2.1 migration document describing all the changes one must, should and could do to their TG project to migrate to 2.1? With explicit patches and pointers to more info (like how to move from Genshi to Mako templates)?
What I love in TG is the relatively painless upgrades for existing software, but some more explicit docs for that would be very appreciated so that I don’t have to do a diff on the quickstart projects between the releases.
@Aigars:
The above document describes all that is needed to migrate from 2.0 to 2.1. Basically, you add:
base_config.renderers.append(‘json’)
To your app_cfg.py, and you are good to go. I appreciate your notion about explicit docs, but in this case, I believe the announcement is enough of a document to describe the changes needed. I will consider adding more about what changes between versions in future alpha releases, and certainly 2.1 final will have an explicit document about what is different from 2.0.
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