Rethink Flask - Eine einfache Todo-Liste mit Flask und RethinkDB

==> Installing rethinkdb
==> Downloading http://download.rethinkdb.com/dist/rethinkdb-     1.11.2.tgz
######################################################################## 100.0%
==> ./configure --prefix=/usr/local/Cellar/rethinkdb/1.11.2 --  fetch v8 --fetch protobuf
==> make
==> make install-osx
==> Caveats
To have launchd start rethinkdb at login:
  ln -sfv /usr/local/opt/rethinkdb/*.plist   ~/Library/LaunchAgents
Then to load rethinkdb now:
  launchctl load   ~/Library/LaunchAgents/homebrew.mxcl.rethinkdb.plist
==> Summary
🍺  /usr/local/Cellar/rethinkdb/1.11.2: 174 files, 29M, built in   19.7 minutes

$ sudo pip install rethinkdb

$ rethinkdb

info: Creating directory /Users/michaelherman/rethinkdb_data
info: Creating a default database for your convenience. (This is because you ran 'rethinkdb' without 'create', 'serve', or '--join', and the directory '/Users/michaelherman/rethinkdb_data' did not already exist.)
info: Running rethinkdb 1.11.2 (CLANG 4.2 (clang-425.0.28))...
info: Running on Darwin 12.4.0 x86_64
info: Loading data from directory    /Users/michaelherman/rethinkdb_data
info: Listening for intracluster connections on port 29015
info: Listening for client driver connections on port 28015
info: Listening for administrative HTTP connections on port 8080
info: Listening on addresses: 127.0.0.1, ::1
info: To fully expose RethinkDB on the network, bind to all addresses
info: by running rethinkdb with the `--bind all` command line option.
info: Server ready

$ python
>>> import rethinkdb
>>> rethinkdb.connect('localhost', 28015).repl()

$ mkdir flask-rethink
$ cd flask-rethink

$ virtualenv --no-site-packages env
$ source env/bin/activate

$ pip install flask
$ pip install flask-wtf

$ pip freeze > requirements.txt

$ python run.py

$ pip install rethinkdb

# rethink imports
import rethinkdb as r
from rethinkdb.errors import RqlRuntimeError

# rethink config
RDB_HOST =  'localhost'
RDB_PORT = 28015
TODO_DB = 'todo'

# db setup; only run once
def dbSetup():
    connection = r.connect(host=RDB_HOST, port=RDB_PORT)
    try:
        r.db_create(TODO_DB).run(connection)
        r.db(TODO_DB).table_create('todos').run(connection)
        print 'Database setup completed'
    except RqlRuntimeError:
        print 'Database already exists.'
    finally:
        connection.close()
dbSetup()

# open connection before each request
@app.before_request
def before_request():
    try:
        g.rdb_conn = r.connect(host=RDB_HOST, port=RDB_PORT, db=TODO_DB)
    except RqlDriverError:
        abort(503, "Database connection could be established.")

# close the connection after each request
@app.teardown_request
def teardown_request(exception):
    try:
        g.rdb_conn.close()
    except AttributeError:
        pass

Database setup completed

@app.route("/")
def index():
    form = TaskForm()
    selection = list(r.table('todos').run(g.rdb_conn))
    return render_template('index.html', form=form, tasks=selection)

$ python
>>> import rethinkdb
>>> conn = rethinkdb.connect(db='todo')
>>> rethinkdb.table('todos').insert({'name':'sail to the moon'}).run(conn)
{u'errors': 0, u'deleted': 0, u'generated_keys': [u'c5562325-c5a1-4a78-8232-c0de4f500aff'], u'unchanged': 0, u'skipped': 0, u'replaced': 0, u'inserted': 1}
>>> rethinkdb.table('todos').insert({'name':'jump in the ocean'}).run(conn)
{u'errors': 0, u'deleted': 0, u'generated_keys': [u'0a3e3658-4513-48cb-bc68-5af247269ee4'], u'unchanged': 0, u'skipped': 0, u'replaced': 0, u'inserted': 1}
>>> rethinkdb.table('todos').insert({'name':'think of another todo'}).run(conn)
{u'errors': 0, u'deleted': 0, u'generated_keys': [u'b154a036-3c3b-47f4-89ec-cb9f4eff5f5a'], u'unchanged': 0, u'skipped': 0, u'replaced': 0, u'inserted': 1}
>>>

@app.route('/', methods = ['GET', 'POST'])
def index():
    form = TaskForm()
      if form.validate_on_submit():
          r.table('todos').insert({"name":form.label.data}).run(g.rdb_conn)
          return redirect(url_for('index'))
      selection = list(r.table('todos').run(g.rdb_conn))
      return render_template('index.html', form = form, tasks = selection)