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Explore A Quickstarted Project

Quickstarting A TurboGears 2.1 Project

Status:Work in progress

We assume that you have TurboGears installed and, if you installed it in a virtual environment as recommended, that your virtualenv is activated. See TurboGears 2.1 Standard Installation to get to this point.

TurboGears 2 extends the paster command-line tool to provide a suite of tools for working with TurboGears 2 projects. A few will be touched upon in this tutorial, check the paster --help command for a full listing.

The very first tool you’ll need is paster quickstart, which initializes a TurboGears 2 project. You can go to whatever directory you want and start a new TurboGears 2 project.

$ paster quickstart

The paster quickstart command will create a basic project directory for you to use to get started on your TurboGears 2 application. You’ll be prompted for the name of the project (this is the pretty name that human beings would appreciate), and the name of the package (this is the less-pretty name that Python will like).

Here’s what our choices for this tutorial look like:

Enter project name: Helloworld
Enter package name [helloworld]: helloworld
Do you need authentication and authorization in this project? [yes]
...output...

This will create a new directory which contains a few files in a directory tree, with some code already set up for you.

Let’s go in there and you can take a look around.

$ cd Helloworld

The setup.py file has a section which explicitly declares the dependencies of your application. The quickstart template has a few built in dependencies, and as you add new python libraries to your application’s stack, you’ll want to add them here too.

Then in order to make sure all those dependencies are installed you will want to run.

$ python setup.py develop

If you have just installed TurboGears and are in a relatively new virtualenv, expect to see a bit of output about additional packages being installed.

Create The Database

Most applications will use a database, and since we specified we are using “authentication” in our quickstart, we need a place to store users and permissions. Before you run your application for the first time, you need to make sure the database is created and initialized. The following command typically only needs to be run once.

$ paster setup-app development.ini

With the quickstart command from above, you will see quite a bit of output which shows you the SQL commands that create the authentication tables and setup a default user/password for you:

user: manager
password: managepass

You don’t need to understand all of this now, but here is a little background about how “paster setup-app” knows what to do. By default, the database is created using SQLite, and the data is stored in a file, devdata.db, in the top level of your project. The information about what database driver is used is specified in the development.ini file passed on the command line. The code which adds the initial data rows is in helloword/web_setup.py. The command “paster setup-app” ends up calling the function “setup_app” within this file.

Another key piece of TG2 application setup infrastructure is the paster setup-app command which takes a configuration file and runs your project’s websetup code in that context. This allows you to use setup-app to create database tables, pre-populate require data into your database, and otherwise make things nice for people first setting up your app. If you take a look at your project’s quickstart, you will see a websetup Python script. Inside of this script, you will see a single functon, setup_app, that is called when paster setup-app is run. Inside of this, you may do any setup you need to for your application. The most common operations will be to add in basic data to the database that is required to bootstrap your application.

Note

If it’s the first time you’re going to use the application, and you told quickstart to include authentication+authorizaiton, you will have to run setup-app to set it up (e.g., create a test database).

$ paster setup-app development.ini

This will create the database using the information stored in the development.ini file which by default makes single file SQLite database in the local file system. In addition to creating the database, it runs whatever extra database loaders or other setup are defined in {yourproject}.websetup:setup_app.

In a quickstarted project with Authorization enabled setup-app creates a couple of basic users, groups, and permissions for you to use as an example. This code is found in {yourproject}.websetup:setup_app. This code also shows how you can add new data automatically to the database when the setup-app command is executed..

Run The Server

At this point your project should be operational, and you’re ready to start up the app. To start a TurboGears 2 app, you need to be in the top level of your project directory (Helloworld) and issue the command paster serve to serve your new application.

$ paster serve development.ini

As soon as that’s done point your browser at http://localhost:8080/ and you’ll see a nice welcome page.

Note

If you’re exploring TurboGears 2 after using TurboGears 1 you may notice a few things:

  • The old config file dev.cfg file is now development.ini.
  • By default the paster serve command is not in auto-reload mode as the CherryPy server used to be. If you also want your application to auto-reload whenever you change a source code file just add the --reload option to paster serve:
$ paster serve --reload development.ini

You might also notice that paster serve can be run from any directory as long as you give it the path to the right ini file.

In order to run the server in development mode, where your Python files are reloaded automatically when they are changed, you typically use the following command.

paster serve --reload development.ini

If you take a look at the code that quickstart created you’ll see that there isn’t much involved in getting up and running. In particular, you’ll want to check out the files directly involved in displaying this welcome page:

  • development.ini contains the system configuration for development.
  • helloworld/controllers/root.py contains the controller code to create the data for the welcome page along with usage examples for various tg2 features.
  • helloworld/templates/index.html is the template turbogears uses to render the welcome page from the dictionary returned by the root controller. It’s standard XHTML with some simple namespaced attributes.
  • helloworld/public/ is the place to hold static files such as pictures, JavaScript, or CSS files.

You can easily edit development.ini to change the default server port used by the built-in web server:

[server:main]
...
port = 8080

Just change 8080 to 80, and you’ll be serving your app up on a standard port (assuming your OS allows you to do this using your normal account).

You might also wish to have paster listening on all IP addresses on your machine. To do so, modify the line right above the port line (in development.ini) to have the value 0.0.0.0, like so:

[server:main]
...
host = 0.0.0.0

What’s Next?