### Minimal TurboGears Web Application

Source: https://github.com/turbogears/tg2/blob/development/README.rst

A basic TurboGears application demonstrating a simple 'Hello World' response. This example uses the MinimalApplicationConfigurator for a microframework setup.

```python
from wsgiref.simple_server import make_server
from tg import MinimalApplicationConfigurator
from tg import expose, TGController

# RootController of our web app, in charge of serving content for /
class RootController(TGController):
    @expose(content_type="text/plain")
    def index(self):
        return 'Hello World'

# Configure a new minimal application with our root controller.
config = MinimalApplicationConfigurator()
config.update_blueprint({
    'root_controller': RootController()
})

# Serve the newly configured web application.
print("Serving on port 8080...")
httpd = make_server('', 8080, config.make_wsgi_app())
httpd.serve_forever()
```

--------------------------------

### Install TurboGears

Source: https://github.com/turbogears/tg2/blob/development/README.rst

Install TurboGears using pip. Ensure you have pip installed first.

```bash
curl -O 'https://bootstrap.pypa.io/get-pip.py'
python get-pip.py
pip install TurboGears2
```

--------------------------------

### Controller-wide Authorization Example

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Demonstrates how to set controller-wide authorization using the 'allow_only' attribute and the '@authorize.require' decorator. This is an alternative to using the !SecureController class.

```python
class SomeSecureController(BaseController):
    allow_only = predicates.has_permission('onePermission')

    @expose('my_package.template.index')
    def index(self):
        # do something here

    @expose('my_package.template.add')
    @authorize.require(predicates.has_permission('specialPerm'))
    def do_things(self, **kw):
        # do other things here
```

--------------------------------

### Remove deprecated middleware setup function

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Remove the import of `setup_tg_wsgi_app` from `tg.middleware` as it has been replaced by a method on `base_config`.

```python
-from pylons.wsgiapp import PylonsApp
-from tg.middleware import setup_tg_wsgi_app

```

--------------------------------

### DBTest Example without explicit database definition

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Shows how a DBTest subclass can be defined when 'sqlalchemy.url' is specified in the 'test.ini' file, making the explicit test database definition optional.

```python
class TestModel(DBTest):
    """The base class for testing models in you TG project."""
    model = model
```

--------------------------------

### Evaluate repoze.what predicates without environ

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Demonstrates how to evaluate repoze.what predicates directly. This is useful for checking conditions like user anonymity without needing the full request environment.

```python
>>> from repoze.what.predicates import not_anonymous
>>> p = non_anonymous()
>>> bool(p) # Will return False if the user is anonymous; True otherwise
False
```

--------------------------------

### Replacing Old Expose with New Expose

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Illustrates the change from the older 'expose' decorator to the new 'expose' decorator with an HTML template specified.

```python
return dict(page='index')
}}}
```

```python
@expose('index.html')
def index(self):
    return dict(page='index')
}}}
```

--------------------------------

### Update expose decorator for new renderers

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

When using new-style renderers, provide the full filename including the extension in the `expose` decorator. The template directory is now registered in the search path.

```python
    @expose('testproject.templates.index')
    def index(self):

```

--------------------------------

### Updating base_config in middleware.py

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Demonstrates the necessary change in config/middleware.py to align with the updated base_config object in TurboGears 2.

```python
-make_base_app = setup_tg_wsgi_app(load_environment, base_config)
+make_base_app = base_config.setup_tg_wsgi_app(load_environment)
```

--------------------------------

### Re-bind SQLAlchemy session in model initialization

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Add a line to `yourapp.model.init_model` to bind the SQLAlchemy session to the provided engine, which is necessary for multi-database support.

```python
def init_model(engine):
   DBSession.configure(bind=enigne) # <-- this, add this
```

--------------------------------

### Updating base_config in environment.py

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Shows the modification required in config/environment.py to adapt to changes in the base_config object for TurboGears 2.

```python
-load_environment = make_load_environment(base_config)
+load_environment = base_config.make_load_environment()
```

--------------------------------

### Displaying Local Objects in TurboGears

Source: https://github.com/turbogears/tg2/blob/development/tests/test.html

This snippet shows how to display all objects from the local scope in TurboGears 2.0. It iterates through local variables and prints their representation.

```Python
All objects from locals():
==========================

${item}: ${repr(locals()['data'][item])}


================================================
```

--------------------------------

### Update module import for configuration

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Change the import statement for configuration modules from `tg.config` to `tg.configuration`.

```python
from tg.config import AppConfig, Bunch
+from tg.configuration import AppConfig, Bunch
```

--------------------------------

### Update authorization plugin configuration

Source: https://github.com/turbogears/tg2/blob/development/CHANGES.txt

Modify the configuration for the authorization plugin to use `user_class`, `group_class`, and `permission_class` instead of `user`.

```python
-base_config.sa_auth.user = model.User
+base_config.sa_auth.user_class = model.User
 base_config.sa_auth.user_criterion = model.User.user_name
 base_config.sa_auth.user_id_column = 'user_id'
+base_config.sa_auth.group_class = model.Group
+base_config.sa_auth.permission_class = model.Permission
```

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