Templates and Views - what counts as "logic"?

Hi all,

I'm creating a blog as a first Django project, since that
seems like a
good way to get my feet wet.  I've run into a problem
displaying a list
of post excerpts with "read more" links.  Here's
my code for the
excerpts:

<ul>
    {% for object in object_list %}
        <h2><a
href="{{object.id}}/">{{ object.title
}}</a></h2>
		<p>{% filter truncatewords:"75" %}{{
object.body }}{% endfilter
%}</p>
    {% endfor %}
</ul>

I'd like to display the "read more" link only if
the post is longer
than 75 words, but I can't seem to figure out how to get
that
conditional test into the template.

Does that mean that this is really view logic?  It seems a
shame to
have to write a custom view function just to do something
that's as
simple and as display-related as that.  Is there any way to
do this in
the template?

Thanks for your help!


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On 10/29/06, ringemup <ringemupgmail.com> wrote:
>
> Does that mean that this is really view logic?  It
seems a shame to
> have to write a custom view function just to do
something that's as
> simple and as display-related as that.  Is there any
way to do this in
> the template?

You could split this into view logic; however, a better
options is
probably to add a method to your model. Django templates can
call any
method on an object that takes no arguments, so a simple
'is_long'
method on the object could be used to determine if any given
object
has more that 75 words.

For example:

class Article(Model):
    ... (fields) ...
    def is_long(self):
        return ...(logic for a long article)...

Then in your template, if object_list is a list of articles:

{% for object in object_list %}
   {{ object.body }}
   {% if object.is_long %}
        ... link to 'read more'
   {% endif %}
{% endfor %}

Yours,
Russ Magee %-)

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On 10/29/06, ringemup <ringemupgmail.com> wrote:
>
> Does that mean that this is really view logic?  It
seems a shame to
> have to write a custom view function just to do
something that's as
> simple and as display-related as that.  Is there any
way to do this in
> the template?

You could split this into view logic; however, a better
options is
probably to add a method to your model. Django templates can
call any
method on an object that takes no arguments, so a simple
'is_long'
method on the object could be used to determine if any given
object
has more that 75 words.

For example:

class Article(Model):
    ... (fields) ...
    def is_long(self):
        return ...(logic for a long article)...

Then in your template, if object_list is a list of articles:

{% for object in object_list %}
   {{ object.body }}
   {% if object.is_long %}
        ... link to 'read more'
   {% endif %}
{% endfor %}

Yours,
Russ Magee %-)

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That definitely looks feasible - thanks!


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That definitely looks feasible - thanks!


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I had this proble too. Heres how i solved it.

First i had a model method:

 def get_wordcount(self):
        return len(self.content.split())

(content is a TextField)

Then in my template i used it like this:

{{ object.content|truncatewords:60 }}
    {% load base_utils %}
		{% ifgreaterthan object.get_wordcount 60 %}
        	         <a href="/news/{{ object.id
}}">read more</a></p>
        	{% endifgreaterthan %}

You'll also need to get the ifgreaterthan custom template
tag from
here:
https://svn.nrcfosshelpline.i
n/public/helpline/trunk/web/templatetags/base_utils.py
(you'll need to edit it a bit)

Hope it helps

Sam Morrison


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I had this proble too. Heres how i solved it.

First i had a model method:

 def get_wordcount(self):
        return len(self.content.split())

(content is a TextField)

Then in my template i used it like this:

{{ object.content|truncatewords:60 }}
    {% load base_utils %}
		{% ifgreaterthan object.get_wordcount 60 %}
        	         <a href="/news/{{ object.id
}}">read more</a></p>
        	{% endifgreaterthan %}

You'll also need to get the ifgreaterthan custom template
tag from
here:
https://svn.nrcfosshelpline.i
n/public/helpline/trunk/web/templatetags/base_utils.py
(you'll need to edit it a bit)

Hope it helps

Sam Morrison


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