CODEWITHSUNDEEP
pythongoogle-app-engine
Ali Sajid
Ali Sajid

Reputation: 4329

How to delete NDB value by key

I want to delete the selected value from the database in ndb, I have the following html code:

Getting the Data in Rooms as:

Class Method:

all_rooms = Room.query().fetch()

template_values = {
    'logout_url': users.create_logout_url(self.request.uri),
    'rooms': all_rooms
}

template = JINJA_ENVIRONMENT.get_template('rooms.html')
self.response.write(template.render(template_values))

HTML:

{% for i in rooms %}
      <br/>
        <form action="/rooms" method="post">
           <input type="hidden" name="roomKey" value="{{ i.key }}"/>
          <input type="submit" value="Delete" name="button"/>
        </form>
    {{i.key}}
    Room Nummber:{{ i.roomNumber }}
    <br/>
{% endfor %}

Which OutPuts As Following:

Key('Room', 4644337115725824) Room Nummber:10

I am passing the key to the delete method which is coming as: Key('Room', 4644337115725824)

How should I retrieve key from it in order to delete the value Room Value.

Upvotes: 0

Views: 56

Answers (1)

CodeBoy
CodeBoy

Reputation: 3300

Use i.key.urlsafe(). This will convert the key to a "url safe" string which is exactly where you plan to use it: in a url.

When you get the roomKey values back, you can convert them back from strings in urlsafe format to ndb Key objects by doing ndb.Key(urlsafe=roomKey) (see this link).

BONUS TIP: This would be extremely insecure code. Okay if this app is just for you (after sign-in) but dangerous if for untrusted users. Why? Well, someone could mock your HTML with keys for any object of any type and then simulate clicking the delete button. Your GAE-side code would blindly convert the urlsafe strings to keys and delete stuff.

Upvotes: 2

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