Question

I am using appengine webapp2 as wsgihandler, jinja2 as the template engine and wtforms as the form module for its support to app engine models.

Following is my simple model:

class TaskCategory(db.Model):
    title = db.StringProperty()
    description = db.TextProperty()


class TaskList(db.Model):
    title = db.StringProperty()
    description = db.TextProperty()
    category = db.ReferenceProperty(TaskCategory)
    start_date = db.DateProperty()
    target_finish_date = db.DateProperty()

Inside my handlers i write stuff as follows:

from wtforms.ext.appengine.db import model_form

model_dict = {'category': TaskCategory,
          'task': TaskList}

class CreateForm(webapp2.RequestHandler):
    def get(self, slug):
        form = model_form(model_dict[slug]) # slug can either be category or task.
        self.render_template('index.html', {'form': form()})

Following is my template:

<form method="POST" action""> 
  <table>
  {% for field in form %}   

    <tr>{{ field.label }}</tr>
    <tr>{{ field()|safe }}</tr>

  <tr>
    {% if field.errors %}
    <td>
      <ul class=errors>
        {% for error in field.errors %}
        <li>{{ error }}</li>
        {% endfor %}
      </ul>
    </td>
    {% endif %}
    {% endfor %}
    </table>
    <input type="submit" class="btn"  value="Submit Form"/>
</form>

Everything renders perfectly in the template, except the dropdown for the foreign key the values listed over there are something like:

    <tr><label for="category">Category</label></tr>
     <tr><select id="category" name="category"><option selected value="__None"></option><option value="ahhkZXZ-bmV3LXByb2plY3QtdGVtcGxhdGVyEgsSDFRhc2tDYXRlZ29yeRgCDA">&lt;models.TaskCategory object at 0xb22d74c&gt;</option>

<option value="ahhkZXZ-bmV3LXByb2plY3QtdGVtcGxhdGVyEgsSDFRhc2tDYXRlZ29yeRgDDA">&lt;models.TaskCategory object at 0xb22dbec&gt;</option>

<option value="ahhkZXZ-bmV3LXByb2plY3QtdGVtcGxhdGVyFgsSDFRhc2tDYXRlZ29yeSIEdGVzdAw">&lt;models.TaskCategory object at 0xb22d74c&gt;</option></select></tr>

As is visible the names are not being displayed for the category, instead the objects are displayed, how can i rectify it, in a generic manner?

Answer 1

Well this has got nothing to do with, WTForm or jinja or webapp2.
Change your database file to return the title in your case, instead of the object using repr as follows:

class TaskCategory(db.Model):
    title = db.StringProperty()
    description = db.TextProperty()

    def __repr__(self):
        return unicode(self.title)