Sometimes when developing a new App Engine app, you want to start fresh with the datastore, wiping everything. Unfortunately, this can be a cumbersome process with the existing interface.

Nuke is a "add-in" to the admin panel that lets you delete all entities of a specific kind, or all entities of all kinds with a button click.

1. Copy bulkupdate into your application's root directory:

git clone git://github.com/Arachnid/bulkupdate.git

2. Copy nuke into your application's root directory:

svn export http://jobfeed.googlecode.com/svn/trunk/appengine/nuke

3. Modify your app.yaml to include the following (this will install both nuke and bulkupdate):

admin_console:
  pages:
  - name: Bulk Update Jobs
    url: /_ah/bulkupdate/admin/

  - name: Nuke
    url: /_ah/nuke/

handlers:
- url: /_ah/queue/deferred
  script: $PYTHON_LIB/google/appengine/ext/deferred/handler.py
  login: admin
  
- url: /_ah/bulkupdate/admin/.*
  script: bulkupdate/handler.py
  login: admin

- url: /_ah/nuke/.*
  script: nuke/nuke.py
  login: admin

4. Redeploy your application

appcfg.py update .

5. Nuke your datastore
• Nuke expects all of your models to be defined in a file named models.py (example) in your root application directory. If this is not the case, you may edit the nuke.py script as desired.