The flow looks fine.  And when you click refresh on your browser on step 4 does 
the page refresh properly?

Perhaps it's a caching issue.
Are you wrapping the billing_payment_view with admin_view()?
https://docs.djangoproject.com/en/2.1/ref/contrib/admin/#django.contrib.admin.ModelAdmin.get_urls
 --> scroll towards the bottom of that section


-----Original Message-----
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On 
Behalf Of Mike Dewhirst
Sent: Sunday, February 3, 2019 1:42 AM
To: django-users@googlegroups.com
Subject: Re: Admin form_url breakout problem

Matthew

I was wrong. I'm still in trouble. I thought it might be an incomplete 
transaction so I tried making the the subscription.save() atomic but to 
no avail.

Here is what happens ...

1.  Add an ingredient which is payable

2.  Save mixture

3.  SubstanceAdmin.change_view() establishes ...

     subscription = None
     if ingredient.is_payable():
         get or create a subscription record and populate it with fee, 
gst etc.
         if the subscription.token field is blank (ie not paid):
             call billing_payment_view() which interfaces with Stripe 
via a js popup and
                 a) gets a token in a hidden field
                 b) calls Stripe.charge(token) and gets a json charge 
record back
                 c) populates the subscription.token field
                 d) saves the subscription record
                 e) creates a receipt record
                 f) sends an email receipt
                 g) puts thank you text and mixture url into context dict
                 h) calls billing_success_view(request, context) to 
display success
                    message including link back to mixture
     return super(SubstanceAdmin, self).change_view()

4.  On clicking the back-to-the-mixture link in success.html, the Admin 
brings
     up the Change Substance page without error but which is blank below the
     "Change Substance" heading. At that time the displayed URL in the 
address
     bar is exactly correct.

5.  If the dev server reloads the page will paint properly if refreshed.

Theory:

The subscription record has been saved but not in a way which is visible 
yet thereby confusing change_view() into thinking the token field is blank.

In other words the transaction needs to be committed 
pre-billing_success_view()

In testing this it sadly this makes no difference.

Mike


On 2/02/2019 6:06 pm, Mike Dewhirst wrote:
> I think I know. Don't waste time on this. I'll report back later.
>
> Mike
>
> On 2/02/2019 3:27 pm, Mike Dewhirst wrote:
>> I thought it was fixed but not so. It works perfectly *only* if the 
>> dev server reloads after all the work and prior to clicking the link 
>> on the success.html template back to the mixture (the substance with 
>> ingredients).
>>
>> I tried a workaround of making the link point to the substances list 
>> page first. No difference. All substance pages come up blank.
>>
>> When I reported earlier that it was working I must have changed some 
>> text in a view to improve the screen wording and on saving the dev 
>> server would have reloaded itself and that hid the problem.
>>
>> The admin url is correct  ...
>>
>> http://localhost:8000/admin/substance/substance/1442/change/
>>
>> ... but that refuses to display. There is no delay, no spinner. The 
>> server console window shows nothing.
>>
>> Not sure where to start looking.
>>
>> Maybe something has corrupted Django's in-memory list of url patterns?
>>
>> Is it caching?
>>
>> Thanks for any non-javascript hints
>>
>> Mike
>>
>> On 30/01/2019 5:13 pm, Mike Dewhirst wrote:
>>> Matthew
>>>
>>> I looked for preventDefault and found it in lots of javascript 
>>> scripts. So I decided instead to look at my python code which is 
>>> slightly easier for me to understand. I sort of refactored it and 
>>> cut large swags out to simplify and inserted lots of print 
>>> statements. Then I thought I'd better read your advice again and try 
>>> harder to understand it.
>>>
>>> The bit which made sense to me was ...
>>>
>>> 'let the admin handle it from there'
>>>
>>> ... I noticed that I was returning the billing payment_view. As soon 
>>> as I removed that 'return' and let the change_view return the super 
>>> call it started working.
>>>
>>> Thank you very much for persisting with me.
>>>
>>> The Admin is fabulous! Nobel prize for something is warranted :)
>>>
>>> Much appreciated
>>>
>>> Mike
>>>
>>> On 29/01/2019 2:31 am, Matthew Pava wrote:
>>>> Hi Mike,
>>>> When Stripe processes the payment, you need to preventDefault on 
>>>> the form submit, then add the token from Stripe to a hidden input 
>>>> in your form without affecting any other data in the form.  Then 
>>>> you can do form.submit() and let the admin handle it from there.  
>>>> Check out the Stripe documentation for some good examples.  I've 
>>>> used it myself.
>>>>
>>>> -----Original Message-----
>>>> From: django-users@googlegroups.com 
>>>> [mailto:django-users@googlegroups.com] On Behalf Of Mike Dewhirst
>>>> Sent: Friday, January 25, 2019 10:26 PM
>>>> To: django-users@googlegroups.com
>>>> Subject: Re: Admin form_url breakout problem
>>>>
>>>> Matthew
>>>>
>>>> I think I'll back everything out and start again. There must be a 
>>>> basic
>>>> blunder somewhere.
>>>>
>>>> Just talking it through, I can definitely launch payment_view from the
>>>> Admin when all the ducks are in a line. That view populates the hidden
>>>> ..._id fields and Stripe API fields in the form then calls the Stripe
>>>> API which initiates the  Stripe javascript in the Payment template 
>>>> which
>>>> resubmits the request with POST direct to Stripe so it can gather the
>>>> card detail and send back the json containing the token which 
>>>> proves the
>>>> card worked. At that point payment is made and my payment_view has 
>>>> lost
>>>> all the context because Stripe made the request not Django. 
>>>> payment_view
>>>> detects the Stripe response and must reconstruct the model instances
>>>> from the data pre-placed in the hidden form fields. Once the instances
>>>> are retrieved that payment_view code updates the subscription record,
>>>> creates a receipt record , assembles a message for the success_view 
>>>> and
>>>> sends an email to the user.
>>>>
>>>> I am having trouble understanding the correct way to launch 
>>>> payment_view
>>>> so that Admin doesn't get confused wanting to add payment/ to the url
>>>> and thus keeping it all within the Admin.
>>>>
>>>> Regarding your comment on using reverse to derive the link, I agree. I
>>>> was just being somewhat paranoid and skipping the reverse code which I
>>>> haven't taken the time to study. I will.
>>>>
>>>> Thanks again
>>>>
>>>> Mike
>>>>
>>>>
>>>> On 26/01/2019 1:59 am, Matthew Pava wrote:
>>>>> Based on the error message, it looks like you’re trying to call
>>>>> reverse(‘admin’) somewhere, but that’s not in the code you shared.
>>>>> Actually, you probably want to use a reverse call when populating
>>>>> content[‘link’].
>>>>>
>>>>> *From:*django-users@googlegroups.com
>>>>> [mailto:django-users@googlegroups.com] *On Behalf Of *Mike Dewhirst
>>>>> *Sent:* Friday, January 25, 2019 3:35 AM
>>>>> *To:* django-users@googlegroups.com
>>>>> *Subject:* Re: Admin form_url breakout problem
>>>>>
>>>>> On 25/01/2019 2:40 am, Matthew Pava wrote:
>>>>>
>>>>>      Hi Mike,
>>>>>
>>>>>      I'm not really seeing why this is throwing errors at you.  It 
>>>>> seems like you've done everything right.  Could you provide the 
>>>>> code (or the relevant parts) for the Substance Admin form?
>>>>>
>>>>>      Thanks!
>>>>>
>>>>>
>>>>> Matthew
>>>>>
>>>>> I'm still in trouble and including some code. I'm not being precious
>>>>> about it just hoping not to overwhelm you. Please ask for the next
>>>>> instalment ...
>>>>>
>>>>> class SubstanceAdmin(admin.ModelAdmin):
>>>>>
>>>>>      def subscribe(self, sm2mi, fee_type, fullyear=False):
>>>>>          """
>>>>>          sm2mi is the substance<-ingredient m2m through record
>>>>>          fee_type determines the subscription fee amount
>>>>>          fullyear=False means calculate the fee pro-rata to 30 
>>>>> September
>>>>>
>>>>>          We don't need a request here so this can be imported from
>>>>> elsewhere.
>>>>>          Only called if a fee is payable. Only returns a subscription
>>>>> if no token or
>>>>>          fullyear == True meaning a subscription renewal is due
>>>>>          """
>>>>>          subscription, new = Subscription.objects.get_or_create(
>>>>>              licensee=sm2mi.substance.division.company,
>>>>>              ingredient=sm2mi.ingredient,
>>>>>              fee_type=fee_type,
>>>>>          )
>>>>>          if not subscription.token or fullyear:
>>>>>              return subscription
>>>>>
>>>>>      def change_view(self, request, object_id, form_url='',
>>>>> extra_context=None):
>>>>>          """
>>>>>          For the billing system we want to include all the context 
>>>>> data
>>>>> so the
>>>>>          change_form populates itself properly. See collect_content
>>>>>          self = SubstanceAdmin
>>>>>          request = wsgi request object
>>>>>          object_id = substance
>>>>>          form_url = no idea!
>>>>>          extra_context = no_idea
>>>>>          """
>>>>>          sm2mis =
>>>>> Substance_Ingredients.objects.filter(substance_id=object_id)
>>>>>          for sm2mi in sm2mis:
>>>>>              payable, fee_type = sm2mi.fee_payable()  # eg., True,
>>>>> PAID_DATA
>>>>>              if payable:
>>>>>                  subscription = self.subscribe(sm2mi, fee_type)
>>>>>                  if subscription:    # we need to collect money 
>>>>> for the
>>>>> owner
>>>>>                      self.change_form_template = 'payment.html'
>>>>>                      content = collect_content(
>>>>>                          sm2mi,
>>>>>                          subscription,
>>>>>                      )
>>>>>                      return payment_view(
>>>>>                          request,
>>>>>                          sm2mi,
>>>>>                          subscription,
>>>>>                          content=content
>>>>>                      )
>>>>>
>>>>>          return super(SubstanceAdmin, self).change_view(
>>>>>              request, object_id, form_url, 
>>>>> extra_context=extra_context,
>>>>>          )
>>>>>
>>>>> Here is the payment form ... which is further down in admin.py
>>>>>
>>>>>      class IngredientsInline(admin.StackedInline):
>>>>>
>>>>>          class PaymentForm(admin.StackedInline.form):
>>>>>              sm2mi_id = forms.CharField(widget=forms.HiddenInput,
>>>>> required=False)
>>>>>              ingredient_id = 
>>>>> forms.CharField(widget=forms.HiddenInput,
>>>>> required=False)
>>>>>              subscription_id =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>              licensee_id = forms.CharField(widget=forms.HiddenInput,
>>>>> required=False)
>>>>>
>>>>>              stripeToken = forms.CharField(widget=forms.HiddenInput,
>>>>> required=False)
>>>>>              stripeEmail = forms.CharField(widget=forms.HiddenInput,
>>>>> required=False)
>>>>>              stripeBillingName =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>              stripeBillingAddressLine1 =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>              stripeBillingAddressZip =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>              stripeBillingAddressState =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>              stripeBillingAddressCity =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>              stripeBillingAddressCountry =
>>>>> forms.CharField(widget=forms.HiddenInput, required=False)
>>>>>
>>>>>          form = PaymentForm
>>>>>
>>>>> All of the above is working so far as launching the Stripe javascript
>>>>> popup and generating the receipt record correctly and so on but does
>>>>> not return to the admin nor render the success page.
>>>>>
>>>>> The try/except block in payment_view() barfs as follows ...
>>>>>
>>>>> content['sm2mi'] = sm2mi
>>>>>              content['receipt'] = receipt
>>>>>              content['subscription'] = subscription
>>>>>              content['message'] = mark_safe(display_message)
>>>>>              content['link'] =
>>>>> '/admin/substance/substance/{0}/change/'.format(
>>>>>                  sm2mi.substance.id
>>>>>              )
>>>>>              # report success to the card payer
>>>>>              try:
>>>>>                  return render(
>>>>>                      template_name='success.html',
>>>>>                      context=content,
>>>>>                      request=request,
>>>>>                  )
>>>>>              except Exception as err:
>>>>>                  print('\n327 billing.views %s' % err)
>>>>>
>>>>>
>>>>> 327 billing.views Reverse for 'admin' not found. 'admin' is not a
>>>>> valid view function or pattern name.
>>>>>
>>>>>
>>>>> Thanks for looking at it
>>>>>
>>>>> Mike
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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