Ok, now I get the point. I STRONGLY suggest to avoid performing big
computations while rendering templates, so I think it is better for you to
try something like
def results_page(request):
context = {}
context.update(locals())
context['periods'] = {}
for period in ['DECEMBER 2011', 'MAY 2011', 'DECEMBER 2010']:
context['periods'][period] = Results.objects.all().filter(\
reg_number =
'DBA/20020/82/DU').filter(<further_filter_by_period>)
return render_to_response('results.html', context, context_instance =
RequestContext(request))
and in template
{% for period,results in periods.items %}
<table class='table table-striped table-bordered'>
[...]
Here you can use {{period}}, which is in turn 'DECEMBER 2011', 'MAY
2011', and so on, and
{{result}} that encompasses the values extracted from the DB.
[...]
</table>
{% endfor %}
I included a filter(<further_filter_by_period>) since I do not know the
models, so I do not know how you can filter out by examination period.
Please note that I would not pass the whole locals() dict to the view, but
carefully select what I need in the template.
Speaking about your filter
@register.filter
def periodofexamination(periodofexam):
periodofexam = ['DECEMBER 2011', 'MAY 2011', 'DECEMBER 2010']
for period in periodofexam:
return period
I think you misunderstood the filter role, which is, indeed, to filter,
things. Here, the input periodofexam variable is not filtered, but
overwritten. Furthermore, you use return in a for loop, so the result of
your filter is 'DECEMBER 2011' irrespective of the input value.
Please check the above code, I wrote it directly in the mail composer, so
bugs are certainly lurking.
Let me know if you succeed in solving the problem
Leo
Leonardo Giordani
Author of The Digital Cat <http://lgiordani.github.com>
My profile on About.me <http://about.me/leonardo.giordani> - My GitHub
page<https://github.com/lgiordani>- My Coderwall
profile <https://coderwall.com/lgiordani>
2013/10/2 +Emmanuel <eluse...@gmail.com>
> Here's the view:
> def results_page(request):
> queryset = Results.objects.all().filter(reg_number = 'DBA/20020/82/DU')
> return render_to_response('results.html', locals(), context_instance =
> RequestContext(request))
>
> Please note that, so far, there's nothing wrong with the view. Using the
> custom filter at the output level is where the issue is.
> What I want to do is something close to this (note the bold items):
>
> *{% for query in queryset|periodofexamination %}*
> <table class='table table-striped table-bordered'>
> <thead><th>Course Code</th><th>Course Name</th><th>Course
> Work</th><th>Exam</th><th>Grade</th><th>GPA</th><th>Year</th><th>Exam
> Period</th></thead>
>
> <tr><td>{{
> query.coursecode}}</td><td>{{query.coursename}}</td><td>{{query.coursework}}</td><td>{{query.exam}}</td><td>{{query.exam|grade}}</td><td>{{query.exam|gpa}}</td><td>{{query.academicyear}}</td><td>{{query.examperiod}}</td></tr>
>
> </table>
> {% endfor %}
> {% endblock %}
>
> On Wednesday, October 2, 2013 3:00:40 PM UTC+3, Leo wrote:
>
>> Can you perhaps paste the view you are using to render the template? So I
>> can try and help your with some code
>>
>> Leonardo Giordani
>> Author of The Digital Cat <http://lgiordani.github.com>
>> My profile on About.me <http://about.me/leonardo.giordani> - My GitHub
>> page <https://github.com/lgiordani> - My Coderwall
>> profile<https://coderwall.com/lgiordani>
>>
>>
>> 2013/10/2 +Emmanuel <elus...@gmail.com>
>>
>>> That's what I have been trying to do for quite sometime now! I can't
>>> seem to get the code right.
>>>
>>>
>>> On Wednesday, October 2, 2013 2:13:25 PM UTC+3, Leo wrote:
>>>
>>>> I'd cycle in the template through a list of exam periods, printing a
>>>> table for each cycle.
>>>> You have to pass the list of exam periods in the context of your view.
>>>>
>>>> Try and let me know.
>>>>
>>>> Regards,
>>>> Leo
>>>>
>>>>
>>>> Leonardo Giordani
>>>> Author of The Digital Cat <http://lgiordani.github.com>
>>>> My profile on About.me <http://about.me/leonardo.giordani> - My GitHub
>>>> page <https://github.com/lgiordani> - My Coderwall
>>>> profile<https://coderwall.com/lgiordani>
>>>>
>>>>
>>>> 2013/10/2 +Emmanuel <elus...@gmail.com>
>>>>
>>>>> Am working on a Django project that retrieves a student's details
>>>>> from the database, filters them based on the 'period of examination' (this
>>>>> is implemented as a python list in a custom filter) and displays the
>>>>> output.
>>>>>
>>>>> *Here is my custom filter:*
>>>>>
>>>>> @register.filter
>>>>> def periodofexamination(**periodofex**am):
>>>>> periodofexam = ['DECEMBER 2011', 'MAY 2011', 'DECEMBER 2010']
>>>>> for period in periodofexam:
>>>>> return period
>>>>>
>>>>> *The template for displaying the output:*
>>>>>
>>>>> {% extends 'base.html' %}
>>>>> {% load results_extras %}
>>>>> {% block title %}My Results{% endblock %}
>>>>>
>>>>> {% block content %}
>>>>> <h3> My Tentative Examination Results</h3>
>>>>> <div class="alert alert-info">The results displayed below are
>>>>> tentative and for information purposes only.</div>
>>>>>
>>>>> <table class='table table-striped table-bordered'>
>>>>> <thead><th>Course Code</th><th>Course Name</th><th>Course
>>>>> Work</th><th>Exam</th><th>**Grad**e</th><th>GPA</th><th>**Year</**th><th>Exam
>>>>> Period</th></thead>
>>>>> {% for query in queryset %}
>>>>>
>>>>> <tr><td>{{ query.coursecode}}</td><td>{{**q**
>>>>> uery.coursename}}</td><td>{{**qu**ery.coursework}}</td><td>{{**que**
>>>>> ry.exam}}</td><td>{{query.**exam**|grade}}</td><td>{{query.**exam|**
>>>>> gpa}}</td><td>{{query.**academic**year}}</td><td>{{**query.**
>>>>> examperiod}}</td></tr>
>>>>>
>>>>> {% endfor %}
>>>>> </table>
>>>>> {% endblock %}
>>>>>
>>>>> *The output:*
>>>>> See the attached file (screenshot.png)
>>>>>
>>>>> *The challenge:*
>>>>> I would like to be able have the student results for a given exam
>>>>> period to appear each in their own table, for instance, all the results
>>>>> for
>>>>> exam period 'December 2011' should be in one table, all the results for
>>>>> exam period 'December 2010' should be in a different table. Currently, all
>>>>> the results appear in one table.
>>>>> How do I implement this using a custom filter?
>>>>> Thanks.
>>>>>
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