Versions

Version’s List

Besides checks django-preflight provides a list of versions for various components. That information is only accessible via web interface, because it’s very easy to get that information from the command line.

Naturally you have an ability to extend this information with any other component you like. By default it contains versions of: Python, Django and django-preflight itself.

Extending Versions List

As with other things, main extension point is Preflight class. You can either add versions(self) method, which should return list of dictionaries, each one containing name and version keys or add class attribute called versions containing the same information.

The method version can be useful if you want to check some items dynamically or include them only if they are available and skipping them otherwise.

Method Example

An example where versions is a method:

import preflight

class AppPreflight(preflight.Preflight):
    def versions(self):
        try:
            import simplejson
            return [{'name': "simplejson",
                     'version': simplejson.__version__}]
        except ImportError:
            return []

preflight.register(AppPreflight)

In this case, if simplejson is available its version will be added to the list of packages displayed by django-preflight.

Attribute Example

An example where versions is an iterable:

import preflight
import setuptools

class AppPreflight(preflight.Preflight):

    versions = [
        {'name': "setuptools", 'version': setuptools.__version__}
    ]

preflight.register(AppPreflight)

On the other hand, this example causes the app to require setuptools to be installed and will fail if this is not the case.