where is my mistake? Can anyone see it?
view.py
error
context should be a dictionary. Your whole if statement needs to be fixed cause idk what happened there and why you did it like that.
Your current error raises (in else block) because you are trying to assign value to a key in dictionary that does not exist.
Fix:
else:
context = {}
context['form'] = some_form() # this is suppose to be your form.
return render(request, 'deneme.html', context)
Now you can access that form in deneme.html with {{form}}.
P.S. You are suppose to paste code in your Qs instead of screenshot of it.
You must Assign the context
Add
context={}
before the context['form']=value()
Related
Came across the very same issue that is well described here : https://github.com/wagtail/wagtail/issues/7344#issue-946329708 but the fix doesn't seem to work in my case.
Basically I have a custom ChooserBlock supposed to make it possible to tie a model's given instance to a StructBlock. Rendering works differently if the ChooserBlock value is blank or not, so it is quite important that it actually can be blank.
But when left blank i stamble upon this error when trying to save :
Field 'id' expected a number but got ''.
The error's stack is exactly the same as the one depicted in the github issue I linked above.
I tried the given fix but it doesn't seem to make any difference, at least for my issue.
class CommunityChooserBlock(blocks.ChooserBlock):
target_model = Community
widget = forms.Select
# Return the key value for the select field
def value_for_form(self, value):
if value == "":
return None
else:
return super().value_from_form(value)
Did I miss anything ?
Edit:
I've also tried to override the get_prep_value and clean methods but it didn't change anything.
def get_prep_value(self, value):
if value == '':
return None
else:
super().get_prep_value(value)
def clean(self, value):
if value == '':
value = None
super().clean(value)
Update : I couldn't come up with a proper fix, so I changed my plans and went for a ChoiceBlock with dynamic choices list, as described here : https://stackoverflow.com/a/60979072/13934028.
It seems to work just fine for my case
I have a simple(I think) question, about Django context rendering.
I'll step right into it -
Basically what I need is, some temp table, which in my case, I called Locked. And when a user presses a button, which Is a form, that object goes straight to the table Locked(just a simple insert). And inside that table there is a field called is_locked, and if its True, that object needs to go gray, or to have some lock icon inside the html table.
Just some kind of a viewable sign, that an object is inside the table Locked, and that another user can't access it.
But, my problem is, since in my views.py, my lock function is not returning exact html where I want to render that locker icon, instead, it returns another html.
Is there any way, to render same context, on 2 html pages? Thank's.
This is my code :
views.py
def lock(request, pk):
# Linking by pk.
opp = get_object_or_404(OpportunityList, pk=pk)
opp_locked = get_object_or_404(Locked, pk=pk)
# Taking two parametters for 2 fields.
eluid = Elementiur.objects.get(eluid=pk)
user = User.objects.get(username=request.user)
# Dont bother with this one! Just pulling one field value.
field_name = 'optika_korisnik'
obj = OpportunityList.objects.get(pk=pk)
field_object = OpportunityList._meta.get_field(field_name)
field_value = getattr(obj, field_object.attname)
# This is the main part! This is where i'm inserting data into Locked table.
if opp_locked.DoesNotExist:
opp_locked.id = int(eluid.eluid)
opp_locked.locked_eluid = eluid
opp_locked.locked_comment = field_value
opp_locked.locked_user = user
opp_locked.locked_name = 'Zaključao korisnik - ' + request.user.username
opp_locked.is_locked = True
opp_locked.save()
# This is what has to be returned, but i need context on the other page.
return render(request, 'opportunity/detalji/poziv.html',
{'opp': opp, 'locked': opp_locked})
else:
# This return has the context that i need(from the first opp_locked variable)
return render(request, 'opportunity/opp_optika.html', {'locked_test': opp_locked})
I can provide more code, but i think that it's not important for this type of question, because all of the logic is happening inside the lock finction, and last two returns.
I just had a quick overview of your snippet sorry if this not help you but you need to review it a little bit.
You call DoesNotExist on an instance of a Locked model
if opp_locked.DoesNotExist: [...]
that's not how you should use this exception.
You have a method .exists() that is available but only for Querysets.
Also if your instance does not exists you are alredy returning an Http404 response when you use get_object_or_404() method.
And perhaps you should avoid sharing primary keys between instances and replace them with models.OneToOneField (OneToOnefield)
Since i got no answers, i added a new field, is_locked, into my Locked model and that solved it.
I ran into this problem while trying to capture POST data.
In Django 1.X, I structured my views like this:
def view_name(request, template_name='template.html'):
variable1 = data
variable2 = moreData
return render_to_response(template_name, locals(), context_instance=RequestContext(request))
Now, I see that render_to_response() has been deprecated, but I'm unsure how to port the code with all of the locals() calls.
Do I have to convert all of my views by building a dict with all desired variables?
Is there another way to port this to keep the locals() incorporation?
Thanks!
You can call this with:
def view_name(request, template_name='template.html'):
variable1 = data
variable2 = moreData
# …
return render(request, template_name, locals())
That being said, please do not use locals(). It makes it very unclear what exactly you pass to the template. Furthermore you often will pass more to the template than you want to. Finally most IDEs will say a variable is not used, and thus you might remove it, but it is in fact used in the template.
Having two views
views.py
def followup(request):
''''''
marklist = report_template(request)
return render(request, 'incident/followup.html',{'somevar':somevar})
def report_template(request):
'''''
report=Report.objects.filter(report=report_id)
''''''
return render(request, 'incident/print.html',
{'report':report})
I am calling one method inside another method.Calling report_template method into followup method.followup method also have variable to render in template.
How to pass the variable of report_template method to followup method and make it display in template.
Thanks
One way to achieve this would be to create a helper method that returns the report or the context needed by both the methods. The issue here is you are returning a HTTPResponse object, and it is cleanest to use helper method here:
def get_report(request):
report=Report.objects.filter(report=report_id)
#do more processing here.
#returning a dict is probably safest here, because, in the calling method, `.get()` would not throw an error if key is not present.
return {'report': report, 'somevar': somevar}
def followup(request):
marklist = get_report(request).get('somevar')
return render(request, 'incident/followup.html',{'somevar':marklist})
def report_template(request):
report = get_report(request).get('report')
return render(request, 'incident/print.html',
{'report':report})
You can not do that with views, you have to look up for templatetags, which is a better way to do so in Django (a view accepts a Request argument and returns an HttpResponse variable).
See https://docs.djangoproject.com/en/dev/howto/custom-template-tags/.
Using templatetags makes your code reusable, by factoring what you do in views.
I'm hoping to use a context processor or middleware to modify the values of the dictionary passed to render_to_response prior to the actual rendering. I have a messaging schema I'm trying to implement that would populate a message list based on the existence of a type of user that I'd like to search the context for prior to the rendering of the template.
Example:
def myview(...):
...
return render_to_response('template.html',
{'variable': variable},
)
and I'd like to be able to add additional information to the context on the existence of 'variable'.
How can I access 'variable' after my view defines it but before it gets to the template so that I can further modify the context?
use TemplateResponse:
from django.template.response import TemplateResponse
def myview(...):
...
return TemplateResponse(request, 'template.html',
{'variable': variable},
)
def my_view_wrapper(...):
response = my_view(...)
variable = response.context_data['variable']
if variable == 'foo':
response.context_data['variable_is_foo'] = True
return response
This is easy. If you have supplied just a little bit more code in your example the answer might have bit you.
# first build your context, including all of the context_processors in your settings.py
context = RequestContext(request, <some dict values>)
# do something with your Context here
return render_to_response('template.html', context)
Update to comment:
The result of a render_to_response() is an HTTPResponse object containing a template rendered against a Context. That object does not (to my knowledge) have a context associated with it. I suppose you could save the result of render_to_response() in a variable and then access the Context you passed it, but I'm not sure what problem you are trying to solve.
Did you modify the Context during rendering? If so you may find that the information is not there any longer because the Context has a scope stack which is pushed/popped during template processing.
You can create a dictonary for the context:
def myview(...):
c = dict()
c["variable"] = value
...
do some stuff
...
return render_to_response('template.html',c)
Maybe the RequestContext is the thing you are looking for.