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1. If the setting isn't in the database, then the specified default is returned. 2. If the setting IS in the database, then the 'value' field, from the database, is returned; Unless, the value is null in the database, then the defined default is returned. * Take case 1. If the default=None then an AttributeError is raised * Thus, by setting default='', in case 1. We don't get an AttributeError because '' will be returned. * Also note that we don't allow_null=True because then the database entry could be None. Accessing the setting would raise an AttributeError in this case. Further, since we set default='' it doesn't matter if null is in the database. TL;DR set default=<something_other_than_None>
Ansible Tower
Tower provides a web-based user interface, REST API and task engine built on top of Ansible.
Resources
Refer to CONTRIBUTING.md to get started developing, testing and building Tower.
Refer to setup/README.md to get started deploying Tower.
Refer to docs/build_system.md for more about Jenkins and installing nightly builds (as opposed to running from source).
Refer to docs/release_process.md for information on the steps involved in creating a release.
Refer to http://docs.ansible.com/ansible-tower/index.html for information on installing/upgrading, setup, troubleshooting, and much more.