Django: hiding the primary key (pk) and using DetailView with get_queryset -

-

following on thread: django: how hash url database object's primary key?, hide primary keys users , use detailview in urlconf. able accomplish hiding using bitwise xor part (it worked in view functions), until got part had "unmask" masked primary key sent in url subclass of detailview.

how "unmask" pk_masked named group before sending detailviewfilteredonuser(detailview) instance? there way send mask_toggle(pk_unmasked) call detailviewfilteredonuser right in urlconf? in searching solutions, found pk_url_kward in django documentation, couldn't work , anyways don't think can me perform operations on primary key detailview operates on.

here masking function:

def mask_toggle(number_to_mask_or_unmask):     return int(number_to_mask_or_unmask) ^ settings.masking_key

my models "pkgs" contain "items":

class pkg(models.model):     user = models.foreignkey(user, editable=false)     tracking_number = models.charfield(max_length=60, unique=true)  class item(models.model):     pkg = models.foreignkey(pkg)     description = models.charfield(max_length=300)

here in urls.py:

class listviewfilteredonuser(listview):     def get_queryset(self):         return pkg.objects.order_by('-created_at').filter(user=self.request.user)  class detailviewfilteredonuser(detailview):     def get_queryset(self):     qs = super(detailviewfilteredonuser, self).get_queryset()         return qs.filter(user=self.request.user)  ....  url(r'^(?p<pk_masked>\d+)/$',     login_required(detailviewfilteredonuser.as_view( model=pkg,                         template_name='pkgs/detail.html'                         )),      name='detail'),

so problem if named group in urlconf "pk", masked primary key (because masked key in url) sent detailview. if named group in urlconf "pk_masked", need pk=mask_toggle(pk_masked) somewhere, , can't figure out or how this. thanks.

if understood problem correctly, need override get_object (which makes get_queryset pretty irrelevant, can still use clarity). like:

class detailviewfilteredonuser(detailview):     model = pkg     template_name = 'pkgs/detail.html'     def get_queryset(self):         return super(detailviewfilteredonuser, self).get_queryset().filter(user=self.request.user)     def get_object(self):         return self.get_queryset().get(pk=mask_toggle(self.kwargs.get("pk_masked"))

(of course, don't forget catch exceptions, left out clarity , brevity.)


Popular posts from this blog

How to calculate SNR of signals in MATLAB? -

-
i've encountered simple, yet fundamental problem on calculating snr: there several signals : s1 = original , pure clean signal without noise. n1 = white gaussian noise going added s1. s2 = s1 + n1 (the noisy signal before performing noise-reduction algorithm) s3 = noise-reduced signal (after performing noise reduction algorithm) n2 = s3 - s1 (the amount of noise after performing noise-reduction algorithm) now want compare snr before , after performing noise-reduction algorithm. which signals should consider snr_before!? s1/n1 or s2/n1 ? which signals should consider snr_after!? s3/n1 or s3/n2 ? which commands or functions should use in matlab in order compute snr_before , snr_after? thanks billion putting time on helping me. what know calculating snr before : snrbeforenoise = mean( signal .^ 2 ) / mean( noise .^ 2 ); and snr after : residual_noise = signal - noise_reduced_signal; snr_after = mean( signal .^ 2 ) / mean( residual_noise .^ 2...
Read more

c# - Attempting to upload to FTP: System.Net.WebException: System error -

-
i have api takes in xml , uploads files based on information in xml. uploads on schedule (also xml), , have tested surrounding , know works. i getting error 40% of time on first file attempt upload in each time cycle (time cycle = 45 minutes files, 30 minutes others). here code upload: try { loggerftp.log("uploading file: " + filename, false); // create request. ftpwebrequest request = (ftpwebrequest)webrequest.create(appsettingsftp.ftpurl + @"/" + filename); request.method = webrequestmethods.ftp.uploadfile; request.timeout = 6000000; //set 100 minutes //request.timeout = -1; //set infinite // add login credentials. request.credentials = new networkcredential(appsettingsftp.ftplogin, appsettingsftp.ftppassword); // grab file contents. streamreader sourcestream = new streamreader(appsettingsftp.uploadfiledirectory + filename); byte[] filecontents = encoding.utf8.getbytes(sourcestream.readtoend()); sourcest...
Read more

ios - UISlider customization: how to properly add shadow to custom knob image -

-
Image
i need place custom knob image shadow uislider. far have image of 38x38, of there region defines shadow of knob. now while using image, when slide knob extreme ends actual knob not able cover end points, hence end points visible under transparent region of knob image this code using customize uislider uiimage *slidebtimg = [uiimage imagenamed:sliderknobimg]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatenormal]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatehighlighted]; how can implement custom knob shadow beneath it, covering end points?? look inside uislider.h , there methods let customize slider knob , track needed. (ios 2.0 , above) // lets subclass lay out track , thumb needed - (cgrect)minimumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)maximumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)trackrectforbounds:(cgrect)bounds; - (cgrect)thumbrectforbounds:(cgrect)bounds trackrect:(cgrect)rect value:...
Read more