CODEWITHSUNDEEP
pythongoogle-app-engineentitygoogle-cloud-datastore
shane716
shane716

Reputation: 155

Google App Engine - updating an entity

I'm using Google App Engine 1.8.3 - Python 2.7 and NDB API as my datastore

Suppose I have a list of group entities displayed on a html table. And I want to click the name of an individual group to edit the group's information. What should the key/id of this group be, which one should I use? Please take a look at below

Here's my Model:

class Group(ndb.Model):
    name = ndb.StringProperty()
    description = ndb.StringProperty()

In my html:

......
{% for group in groups %}
    <tr>
       <td>
        <a href="/editGroup?id={{ ????????????? }}" {{ group.name}} </a>
       </td>
       <td>
        {{ group.description}}
       </td>
    </tr>
{% endfor %}
......

In the ????? inside the <a> tag, what should I put? what should I pass it back to the server? group.key? group.key.id()? or I have to add the Property to Group model as a key property like groupId = ndb.IntegerProperty()?

I'm thinking about using the entity's key, but I couldn't find a way to display the key in the html from 'group', like group.something_to_get_the_key().

I was able to get the numeric id using group.key.id(), but according to https://developers.google.com/appengine/docs/python/ndb/entities#numeric_keys numeric ids might not be unique.

Thanks

Upvotes: 0

Views: 554

Answers (1)

Daniel Roseman
Daniel Roseman

Reputation: 599610

In NDB, keys have a urlsafe() method which produces a string suitable for use in templates and passing to URLs:

{{ group.key.urlsafe }}

This is documented on the same page you already link to.

Upvotes: 2

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