Passing multiple arguments from django template href link to view

Question

I am trying to pass some arguments with a link url href in a template to a view.

In my template :

<a href="/print-permission-document/ studentname={{studentinfo.0}} studentsurname={{studentinfo.1}} studentclass={{studentinfo.2}} doctype=doctype-studentlatepermission">Print</a>

So i am trying to pass 4 arguments to my view.

My view is :

def print_permission_document(request, studentname, studentsurname, studentclass, doctype):
file_write(studentname.encode('utf-8')+" "+studentsurname.encode('utf-8')+" "+studentclass+" "+doctype)
return response

My urls.py is :

url(r'^print-permission-document/.+$', print_permission_document, name='print-permission-document')

But i get below error :

Exception Type: TypeError Exception Value:
print_permission_document() takes exactly 5 arguments (1 given)

What about reading the doc first ? docs.djangoproject.com/en/2.1/intro/tutorial03 — bruno desthuilliers
– bruno desthuilliers, Commented Oct 24, 2018 at 11:38

willeM_ Van Onsem · Accepted Answer · 2018-10-24 11:45:15Z

2

This is not how you specify multiple parameters in a URL, typically you write these in the URL, like:

url(
    r'^print-permission-document/(?P<studentname>\w+)/(?P<studentsurname>\w+)/(?P<studentclass>\w+)/(?P<doctype>[\w-]+)/$',
    print_permission_document, name='print-permission-document'
)

Then you generate the corresponding URL with:

<a href="{% url 'print-permission-document' studentname=studentinfo.0 studentsurname=studentinfo.1 studentclass=studentinfo.2 doctype='doctype-studentlatepermission' %}">Print</a>

This will then generate a URL that looks like:

/print-permission-document/somename/someclass/doctype-studentlatepermission

Typically a path does not contain key-value pairs, and if it does, you will need to "decode" these yourself.

You can also generate a querystring (after the question mark), these you can then access in request.GET [Django-doc].

edited Oct 24, 2018 at 11:45

answered Oct 24, 2018 at 11:37

willeM_ Van Onsem

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5 Comments

ivbtar Over a year ago

Thanks Williem, now i get below error Exception Type: NoReverseMatch Exception Value: Reverse for 'print-permission-document' with arguments '()' and keyword arguments '{u'studentsurname': 'SURMAN', u'studentname': 'Aleksa', u'studentclass': '4N', u'doctype': u'doctype-studentlatepermission'}' not found. 1 pattern(s) tried: ['print-permission-document/(?P<studentname>\\w+)/(?P<studentsurname>\\w+)/(?P<studentclass>\\w+)/(?P<doctype>\\w+)/$'] Exception Location: /home/minimus/Env/minimus/lib/python2.7/site-packages/django/core/urlresolvers.py in _reverse_with_prefix, line 508

willeM_ Van Onsem Over a year ago

@ivbtar: I forgot the hyphen in the pattern for the doctype, so [\w-]+ instead of \w+.

ivbtar Over a year ago

Hi Villiem. Problem continues for one scenario. If there is an empty space in studentname it breaks. It works for "Jack" but if he has double name "Jack John" it fails with Reverse for 'print-permission-document' with arguments '()' and keyword arguments '{u'studentno': 20170224L, u'studentsurname': 'K\xc3\x87LAN', u'studentname': 'Jack John', u'studentclass': '12Y', u'doctype': u'doctype-studentlatepermission'}' not found. 1 pattern(s) tried: ['print-permission-document/(?P<studentname>\\w+)/(?P<studentsurname>\\w+)/(?P<studentclass>\\w+)/(?P<studentno>\\w+)/(?P<doctype>[\\w-]+)/$']

willeM_ Van Onsem Over a year ago

@ivbtar: then you can change the \w+s to [\w ]+s, etc. but spaces in URLs are typically not a good idea in general. Usually slugs are used.

ivbtar Over a year ago

Thanks you so much Villiem. It worked again. Let me also check slugs.

Daniel Kilanko · Accepted Answer · 2018-10-24 11:40:02Z

1

You are passing your URL wrongly. and URL in template is also declared wrongly.

Try this

<a href="{% url 'print-permission-document' studentinfo1, studentinfo2, ... %}">Print</a>

url(
    r'^print-permission-document/(?P<studentname>\w+)/(?P<studentsurname>\w+)/(?P<studentclass>\w+)/(?P<doctype>\w+)/$',
    print_permission_document, name='print-permission-document'
)

answered Oct 24, 2018 at 11:40

Daniel Kilanko

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Comments

Tono Kuriakose · Accepted Answer · 2019-11-27 07:46:04Z

0

I had the same error , i corrected it by :

url(r'^auth_app/remove_user/(?P<username2>[-\w]+)/$', views.remove_user, name="remove_user"),

Use this pattern for passing string

(?P<username2>[-\w]+)

This for interger value

(?P<user_id>[0-9]+)

answered Nov 27, 2019 at 7:46

Tono Kuriakose

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