CODEWITHSUNDEEP
pythongoogle-app-engine
Vincent van Bergen
Vincent van Bergen

Reputation: 65

How to refer to an entity using NDB by google app engine

I am using gae-boilerplate (webapp2 and jinja2). My model looks like this:

class Location(ndb.Model):
    x = ndb.FloatProperty()
    y = ndb.FloatProperty()

class Criterium(polymodel.PolyModel):
    name = ndb.StringProperty(required=True)
    user = ndb.KeyProperty(kind='User')
    priority = ndb.IntegerProperty(required=True)

class Work(Criterium):
    location = ndb.StructuredProperty(Location)

class Friend(Criterium):
    location = ndb.StructuredProperty(Location)

I have a table with all records from the Criterium model. I would like to add a delete link there, but I don't know what argument to pass with it in order to refer to the specific entity. My handler looks like this:

def get(self):
    criteria = Work.query().order(-Criterium.priority, Criterium.name)
    self.view.list_columns = [('name', 'Name'),
                         ('priority', 'Priority'),
                         ('className', 'Type')]
    self.view.criteria = criteria
    self.view.count = criteria.count()
    params={}
    self.render_template('list.html', **params)

Seems like a simple problem, but have been struggling all day... Thanks in advance!

Upvotes: 1

Views: 389

Answers (2)

llew
llew

Reputation: 1

see example below

from google.appengine.ext import ndb

class User(ndb.Model):

created = ndb.DateTimeProperty(auto_now_add = True)
firstName = ndb.StringProperty(required = True)
lastName = ndb.StringProperty(required = True)
email = ndb.StringProperty(required = True)
pwHash = ndb.StringProperty(required = True)

@classmethod
def byEmail(cls, email):
    u = cls.query(cls.email == email).get()
    return u

@classmethod
def register(cls, firstname, lastname, email, password):
    pwhash = utils.makePwHash(email, password)
    return User(firstName=firstname,
        lastName=lastname,
        email=email,
        pwHash=pwhash)

@classmethod
def login(cls, email, password):
    u = User.byEmail(email)
    if u and utils.validPW(email, password, u.pwHash):
        return u

Upvotes: 0

aschmid00
aschmid00

Reputation: 7158

what about the id of the object?
thats the unique identifier for that object within the Criterium model.

when looping over the criteria entities:

for criterum in criteria:
    criterum.key.id()

Upvotes: 1

Related Questions