Question

I’ve used this example to to implement some sort of guestbook, only I’m using django framework.
I can’t use db.key() function in the html file so I thought maybe I should pass the html with the string representation of the key and by this solve this issue. I checked the docs and it says

A key can be converted to a string by passing the Key object to str().

so I’ve used :

all_messages = db.GqlQuery( "SELECT * FROM Messages WHERE ANCESTOR IS :1 ORDER BY date DESC LIMIT 20" ,  image_key('name'))
    for msg in all_messages:
        msg.img_key_func = str(msg.key())

is this the correct way to convert key to string?

my html looks like this:

<ol name="list">
    {% for message in all_messages %}
    <li><div><img src="img?img_id={{ message.img_key_func }}"></img>{{ message.content }}</div></li>
    {% endfor %}
</ol>

What i need to do is simply something like this example:

            self.response.out.write("<div><img src='img?img_id=%s'></img>" %
                                      greeting.key())

the outcome of the logs is: /img?img_id=None and thus, I cant display the images.

is there an easier way to do this?
Thanx!

EDIT 1: more info

the submit button triggers

class Sender(webapp.RequestHandler):

with the following:

def post(self):
    accountName = self.request.get( "accountName" )
    text = self.request.get( "text" )
    message = Messages(parent=image_key('name'))
    message.content = self.request.get( "text" )
    avatar = self.request.get('img')
    if avatar:
        avatar = images.resize(self.request.get("img"), 32, 32)
        image_full = self.request.get("img")
        message.avatar = db.Blob(avatar)
        message.imageblob = db.Blob(image_full)
    message.put()

the Messages(db.Model) looks like:

class Messages(db.Model):
    imageblob = db.BlobProperty()
    avatar = db.BlobProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateTimeProperty(auto_now_add=True)


    def image_key(some_id='name'):
        return db.Key.from_path('StartPage', 'name')

the question is,Should I store the avatar right after download Or I should resize very time a get_main_page is requested? this way I can avoid storing 2 images -one full size and another avatar.
should i still use image_key?

Answer 1

This:

I can’t use db.key() function in the html file

is not true. You can use any functions or methods that don’t take arguments in a template. So, as thebjorn pointed out in the comment, this would work fine:

img_id="{{ message.key }}"

because the template language would call the key() method and then convert it to string for output.