Problem comparing keys in Appengine/Python

Question

I'm trying to create a relationship between "tables" with Appengine/Python. Imagine I have a "table" for items, and a table for colors. I save the color of an item by saving the color key as an atribute of the item.

That's working well, but this particular piece of code is not working:

<select id="colorKey" name="colorKey">
  {% for color in colors %}
    <option value="{{ color.key }}"{% if color.key = item.colorKey %} selected="selected"{% endif %}>
      {{ color.name }} - {{ item.colorKey }} - {{ color.key }}
    </option>
  {% endfor %}
</select>

Since the {{ item.colorKey }} and {{ color.key }} variables are actually the same chain of characters, I only can think in a problem with the types.

{{ item.colorKey }} is a string for sure. But maybe {{ color.key }} is not?

Answer 1

 {% if color.key = item.colorKey %}

One too few ==?

Answer 2

Django doesn't support arbitrary expressions in 'if' tags (or anything else for that matter). You need to use the 'ifequal' tag - see the docs for details.