python - Django get model by querystring -


i want user able pass querystring in url https://example.com/models?id=232. query string optional. https://example/models should work too. im trying this:

def myview(request, model):         context = {         'model': model,         }         if request.get.get('id', none) != none , model.objects.get(pk=request.get.get('id', none)).exists():             id = request.get.get('id', none)             context['id'] = id             return render(request, 'tests.html', context)         else:             return render(request, 'tests.html', context)

s going on in code above: want check if there query string (which models id) , if there exists model. bu tmy code not work. if both of these requirement not satisfied should load tests.html without id , without errors. how can that? id should number looking forward answers :d

you getting error attributeerror: 'modelname' object has no attribute 'exists', because .exists() function available .filter(...) method.

def myview(request, model):     id = request.get.get('id', none)     context = {'model': model, 'id': id}      if id not none , id.isdigit():         if modelname.objects.filter(pk=id).exists():             context['id'] = id     return render(request, 'tests.html', context)

another way, can use exception of modelname.doesnotexist;

# ... django.http import http404  def myview(request, model):     id = request.get.get('id', none)     context = {'model': model, 'id': id}      if id not none , id.isdigit():         try:             obj = modelname.objects.get(pk=id)             context.update({'id': obj.id})         except modelname.doesnotexist:             raise http404      return render(request, 'tests.html', context)

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more