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Convert user.id to user.username in Django template

I am implementing the very cool third party package Django-Simple-History into a project. Per the documentation I'm using the middleware to store which user makes changes to an object. This makes it easy to iterate over in the template like:
{% for x in object.history.all %}
{{ x.history_date }}, {{ x.history_user_id }} <br />
{% endfor %}
I am trying to use the available user.id to get the correlating user.username in the template. Any suggestions? (I'm still pretty new to Django/Python) Thanks!

history_user holds the ForeignKey for the related user.
You can use: {{ x.history_user.username }}

Why django finds errors inside comment blocks in template?

Sometime Django finds an error in a template. I Would like to comment out the row to debug but django keeps to find the error even in the comment.
For example this link give me an error because url 'prova' don't exist.
<!--Prova<br/>-->
another example: here {{ field }} give an error (and I don't know why but this is another problem)
<!--{% for field in form.visible_fields %}
{{ field.errors }}
{{ field.label }}
{{ field }}
{{ field.help_text }}
<br />
{% endfor %}-->
Maybe there's another way to comment?
Thank you

Django still parses the code; it doesn't care about HTML comments. If you want to ensure that it does not get rendered at all, you should use the Django comment tags, {% comment %}...{% endcomment %}.
For a single line, you can wrap things in {# ... #}.
See the docs.

Django: How to associate a comment to its corresponding OP in the HTML template?

I have designed a simplistic posting and comment system where each postcomment object is associated with its corresponding newpost object using foreign key. My problem is that the comments in the template aren’t showing under their corresponding newpost object. For example, if there are a total of 3 newposts and 3 comments under each post for a total of 9 comments, the template displays all 9 comments under each 3 posts (for a total of 27 comments). I need help figuring out how to correctly associate each comment with its corresponding post and not just loop through my ‘allcomments’ field under each post. Thanks for any help and hints.
postset = pagename.newpost_set.all().order_by('-postdate') #i use this to get a queryset of all posts on the selected page and order them so newest posts show up at the top
allposts = newpost.objects.filter(newposttag=‘userpage’) #i use this to get a queryset of all posts on the corresponding user’s page for the next line, this might seem redundant after the above, but it works because the postset is what I end up using in the template.
allcomments = postcomment.objects.filter(commenttag=allposts) #i use this to get a queryset of all the comments from each post in the ‘allposts’ queryset
Here is my template for displaying the above information that I have acquired
{% for postset in postset %}
<br>{{ postset.postcontent }} {{postset.postdate }} - {{ postset.postlikes }} likes Comment</br>
{% for allcomments in allcomments %}
<br> {{ allcomments.comment }} {{allcomments.postcommentdate }} - {{ allcomments.commentlikes}}
{% endfor %}
{% endfor %}

How about updating your template as follows:
{% for post in postset %}
<br>{{ post.postcontent }} {{post.postdate }} - {{ post.postlikes }} likes Comment</br>
{% for comment in post.postcomment_set.all %}
<br> {{ comment.comment }} {{comment.postcommentdate }} - {{ comment.commentlikes}} </br>
{% endfor %}
{% endfor %}
This way, you iterate over your posts and for each post, you retrieve the comments related to that post through the post.postcomment_set.all expression.
Please let me know if that helps you.
ps: I don't think that you need those three queries in your view though.

Python/Django: Simple Django Template

Hi I am using App Engine/Python to do a simple website. I have some trouble with a Django template problem.
In short, I want to use a "ShortName" to access a "LongName".
The soource code:
LongName={"so":"stackoverflow","su":"superuser"}
ShortName=['so','su']
Then I pass these two parameters to the templates.
In the template I write:
{% for aname in ShortName %}
{{ aname }} stands for {{ LongName.aname }},
{% endfor %}
The output is:
so stands for, su stands for
No error is given. The LongName.aname wont work.
I have no idea whats wrong.

This is trying to access LongName['aname'], not LongName[aname].
You might have to write a custom template tag/filter to get this to work. This Django bug (marked WONTFIX) has a simple implementation:
def get(d, key):
return d.get(key, '')
register.filter(get)
which you would use by
{{ LongName|get:aname }}
after adding it to your app (that SO answer shows how to do it on GAE).
You could also pre-make a variable to loop over in the view, by passing in
# in view
name_abbrevs = [(k, LongName[k]) for k in ShortName]
# in template
{% for short_name, long_name in name_abbrevs %}
{{ short_name }} stands for {{ long_name }}
{% endif %}
If you really don't want to add a template tag -- which isn't that bad! you just make one file! :) -- or pass in an extra variable, Vic's approach will let you do this without touching the Python files at all. As he mentions, it involves a lot of pointless iteration, but it'll work fine for small lists.

Django templates have a drawback here. I've been in the same situation before. What you have to do is iterate over all the keys in LongName, and check if the key you're looking for matches the ShortName. Here you go:
{% for aname in ShortName %}
{% for short_version, long_version in LongName %}
{% if aname == short_version %}
{{ aname }} stands for {{ long_version }},
{% endif %}
{% endfor %}
{% endfor%}
It's inefficient, and essentially a pointless O(n^2) mechanism. However, there's no better way in pure Django templates to refer to entries of a dict by a variable name.

Django-cms haystack search - placeholder content

i have problem with results in django-cms and haystack search. I'm using django-cms-search plugin, haystack as backend. Haystack returns correct results. But i want to show "teaser" in search results.
I can access absolute URL and title of page via template this way:
{% for result in page.object_list %}
<div class="searchResults">
<h2>{{ result.object.get_title }}</h2>
{{ result.object.placeholders.all }}
<p>{% blocktrans %} Read more {% endblocktrans %}</p>
Problematic part is {{ result.object.placeholders.all }}. I have on every page content in placeholder with name content.
{{ result.object.placeholders.all }} returns only name of the placeholders.
Search results should look like this:
PAGE TITLE
PAGE TEASER
READ MORE LINK
In teaser there should be first 50 words from search-matched page.
Is this possible to access placeholder content from template?
Thank you for your tips.

Haystack has templatetag higlight which creates "teaser" as i requested.
Template code can look like this:
{{ result.object.get_title }}
{% highlight result.text with request.GET.q max_lenght 40 %}
{{ result.object.get_absolute_url }}
Thanks to guys from #haystack IRC channel.