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copied!<p>You'll need to pass the complete list of categories and also an index of user-selected categories to your template. You don't need to convert the <code>NewsCategory</code> queryset into a list in your view, by the way:</p> <p><strong>View</strong></p> <pre><code>categories = NewsCategory.objects.all() user_preferences = [item.id for item in Profile.preference.all()] </code></pre> <p>The <code>user_preferences</code> variable will act as a lookup index for our template.</p> <p>Then you loop through all the categories in the template, and check to see if it exists in the list of user preferences:</p> <p><strong>Template</strong></p> <pre><code><div id="c_b"> {% for c in categories %} <input type="checkbox" name="category[]" id="id_{{ c.category }}" value="{{ c.id }}" {% if c.id in user_preferences %}checked="checked"{% endif %} /> <label for="id_{{ c.id }}">{{ c.category }}</label> {% endfor %} </div> </code></pre> <p><strong>Update - saving user preferences</strong></p> <p>There is no hard and fast rule here. The main consideration, as far as I am concerned, would be minimising database hits. You can just clear the user preferences, like you say, and add the new ones - in fact, this is how Django's admin handles it. Just make use of Django's transaction management:</p> <pre><code>from django.db import transaction @transaction.commit_manually def add_preferences(user, preferences): user.preference.clear() for pref in preferences: user.preference.add(pref) transaction.commit() </code></pre>

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