Not sure if creating a class for both (ocassions and subject) is the right way to go (you might just want to add strings on Greeting class). Anyways, lets focus on Subject for a couple of things you are missing:

1. You still need to map both classes on the Greeting class:

   class Greeting(ndb.Model):

    author = ndb.StructuredProperty(Author)
    content = ndb.StringProperty(indexed=False)
    date = ndb.DateTimeProperty(auto_now_add=True)
    subject = ndb.StructuredProperty(Subject)
    occassion = ndb.StructuredProperty(Occasion)
   

2. Include the assignation on the
   def post(self) Post method:

    greeting.content = self.request.get('content')
    greeting.subject = Subject(
                      subject=self.request.get('subject'))
    greeting.occassion = Occasion(
                      occasion=self.request.get('event'))
    greeting.put()
   

*Notice the ‘event’ when creating the “occasion” object, it should match the “name” attribute for the “events” select html tag.

3. HTML tags should be inside the <form…> and should look like this:

<form action="/sign?guestbook_name={{ guestbook_name }}" method="post">
        <div class="subject-area">
        <label for="subject">Subject:</label>
        <textarea id="subject" name="subject" rows="1"></textarea>
        </div>
        <div class="occasion-area">
        <label for="occasions">Choose an Occasion:</label>
            <select id="events" name="event">
            <option value="Christmas">Christmas</option>
            <option value="New Year">New Year</option>
            <option value="Easter">Easter</option>
            <option value="Australia Day">Australia day</option>
            </select>
        </div>
        <div><textarea name="content" class="input-block-level" rows="3"></textarea></div>
        <div><input type="submit" class="btn btn-large btn-primary" value="Sign Guestbook"></div>
 </form>

4. Print the value on the html with the jinja2 syntax:

<div class="container">
  <!-- [START greetings] -->
  {% for greeting in greetings %}
  <div class="row">
    {% if greeting.author %}
      <b>{{ greeting.author.email }}
        {% if user and user.user_id() == greeting.author.identity %}
          (You)
        {% endif %}
      </b> wrote:
    {% else %}
      An anonymous person wrote:
    {% endif %}
    <blockquote>{{ greeting.subject.subject }}</blockquote>
    <blockquote>{{ greeting.occasion }}</blockquote>
    <blockquote>{{ greeting.content }}</blockquote>
  </div>
  {% endfor %}

With 1 and 2 you will correctly store the values on Datastore, you can check it out on Console > Datastore > Entities. With 3 and 4 you will be able to interact with the values from the frontend side.

So im currently using the Google Guestbook Sample App and completely new to this.

What I want to do is create a textbox that lets the user put in a subject, and a drop down menu that has a list of occasions as well as a message to sign to the guestbook.

Ive added this in the HTML index file as shown below. This works fine and shows the content on the page.

<div class="subject-area">
    <label for="subject">Subject:</label>
    <textarea id="subject" name="subject" rows="1"></textarea>
    </div>

    <div class="occasion-area">

    <label for="occasions">Choose an Occasion:</label>
        <select id="events">
        <option value="Christmas">Christmas</option>
        <option value="New Year">New Year</option>
        <option value="Easter">Easter</option>
        <option value="Australia Day">Australia day</option>
        </select>
    </div>

In my python application I’ve added new Classes for Subject and Occasion for the datastore.

class Subject(ndb.Model):

subject = ndb.StringProperty(indexed=False)

class Occasion(ndb.Model):

occasion = ndb.StringProperty(indexed=False)

Now I want to store the subject and occasion value into DataStore but when I go to my DataStore it no entity as show in image link 1. Ive tried to get the values but didn’t seem to work.

greeting.subject = self.request.get('subject')
    greeting.put()

    greeting.occasion = self.request.get('occasion')
    greeting.put()

Once Ive submitted all of the values(message, subject, occasion) I want to display it all on the page after submitting but not quite sure on how to do that yet?

Heres what my page looks like so far – 2