I’ve discovered a ‘hack’ to correct the issue. I committed and pushed my
changes up to my GitHub repo for those curious enough to try it out
yourself.
My problem now is that I don’t really understand why it works. Here I will
explain what I do know and then my ask would be for you people to fill in
the gaps in my explanation. First I share my working code.
Here is my views.py which includes the relevant function I use:
from django.http import HttpResponse
from django.shortcuts import render
def home(request):
if 'ccEntry' in request.GET:
number = request.GET['ccEntry']
redacted_num = 'xxxx xxxx xxxx {}'.format(number[-4:])
return render(request, 'home.html', {'number':number, 'redacted_num':
redacted_num})
else:
return render(request, 'home.html')
Here is my lucid, cerebral explanation of the above Python code in plain
English: At line 4 I am defining the `home` function. Then there is a
conditional referring to the ‘ccEntry’ string inside the template. If
ccEntry is present in the GET request, then a `number` variable is declared
based on the user input on the web page. Then a `redacted_num` variable is
declared which will appear as a string (‘xxxx xxxx xxxx ’ with the last 4
characters lopped off (the slice). If all of the above is in order, then
the render function will be returned:
-
with the standard request,
-
with reference to the home.html template,
-
along with a dictionary with a ‘number’ string matching up with the
`number` variable. Ditto for the redact_num.
However if the above condition is false, then the render function will
return the standard request and home.html template without a dictionary.
That’s pretty much everything I understand.
I’m not sure why a conditional as it appears above is necessary.
Would someone here care to explain, if you can?
On Thursday, March 7, 2019 at 4:05:28 PM UTC-5, drone4four wrote:
>
> This is a long shot, but I thought I would share a link to my source code
> hosted on GitHub with a requirements.txt included. If any of you would like
> to test this out yourself, I am accepting pull requests. Here it is:
> https://github.com/Angeles4four/CC_Redact
>
>
> On Thursday, March 7, 2019 at 4:03:37 PM UTC-5, drone4four wrote:
>>
>> I am taking a course on Udemy and the instructor doesn’t include a method
>> attribute in the form tag. But as you suggested, Deepak, I went ahead and
>> added method="get" to my form tag in my home.html template. So line 7 now
>> reads: <form action="{% url 'home' %}" method="get">
>>
>> I am still encountering the MultiValueDictKeyError.
>>
>> Here is the traceback again:
>>
>> MultiValueDictKeyError at /
>>
>> 'ccEntry'
>>
>> Request Method: GET
>>
>> Request URL: http://127.0.0.1:8000/
>>
>> Django Version: 2.0.2
>>
>> Exception Type: MultiValueDictKeyError
>>
>> Exception Value:
>>
>> 'ccEntry'
>>
>> Exception Location:
>> /home/<user>/.local/lib/python3.7/site-packages/django/utils/datastructures.py
>>
>> in __getitem__, line 79
>>
>> Python Executable: /usr/sbin/python
>>
>> Python Version: 3.7.2
>>
>> Python Path:
>>
>>
>> ['/home/<user>/dev/projects/python/2018-and-2019/cel2fah-original_with_CC-redact-project-_Django202/first_project_attempt',
>>
>> '/usr/lib/python37.zip',
>>
>> '/usr/lib/python3.7',
>>
>> '/usr/lib/python3.7/lib-dynload',
>>
>> '/home/<user>/.local/lib/python3.7/site-packages',
>>
>> '/usr/lib/python3.7/site-packages',
>>
>> '/usr/lib/python3.7/site-packages/setuptools-40.6.2-py3.7.egg']
>>
>> Server time: Thu, 7 Mar 2019 20:11:44 +0000
>>
>> Environment:
>>
>>
>> Request Method: GET
>>
>> Request URL: http://127.0.0.1:8000/
>>
>> Django Version: 2.0.2
>>
>> Python Version: 3.7.2
>>
>> Installed Applications:
>>
>> ['django.contrib.admin',
>>
>> 'django.contrib.auth',
>>
>> 'django.contrib.contenttypes',
>>
>> 'django.contrib.sessions',
>>
>> 'django.contrib.messages',
>>
>> 'django.contrib.staticfiles']
>>
>> Installed Middleware:
>>
>> ['django.middleware.security.SecurityMiddleware',
>>
>> 'django.contrib.sessions.middleware.SessionMiddleware',
>>
>> 'django.middleware.common.CommonMiddleware',
>>
>> 'django.middleware.csrf.CsrfViewMiddleware',
>>
>> 'django.contrib.auth.middleware.AuthenticationMiddleware',
>>
>> 'django.contrib.messages.middleware.MessageMiddleware',
>>
>> 'django.middleware.clickjacking.XFrameOptionsMiddleware']
>>
>>
>>
>> Traceback:
>>
>> File
>> "/home/<user>/.local/lib/python3.7/site-packages/django/utils/datastructures.py"
>>
>> in __getitem__
>>
>> 77. list_ = super().__getitem__(key)
>>
>> During handling of the above exception ('ccEntry'), another exception
>> occurred:
>>
>> File
>> "/home/<user>/.local/lib/python3.7/site-packages/django/core/handlers/exception.py"
>>
>> in inner
>>
>> 35. response = get_response(request)
>>
>> File
>> "/home/<user>/.local/lib/python3.7/site-packages/django/core/handlers/base.py"
>>
>> in _get_response
>>
>> 128. response = self.process_exception_by_middleware(e,
>> request)
>>
>> File
>> "/home/<user>/.local/lib/python3.7/site-packages/django/core/handlers/base.py"
>>
>> in _get_response
>>
>> 126. response = wrapped_callback(request,
>> *callback_args, **callback_kwargs)
>>
>> File
>> "/home/<user>/dev/projects/python/2018-and-2019/cel2fah-original_with_CC-redact-project-_Django202/first_project_attempt/first_project_attempt/views.py"
>>
>> in home
>>
>> 5. number = request.GET['ccEntry']
>>
>> File
>> "/home/<user>/.local/lib/python3.7/site-packages/django/utils/datastructures.py"
>>
>> in __getitem__
>>
>> 79. raise MultiValueDictKeyError(key)
>>
>> Exception Type: MultiValueDictKeyError at /
>>
>> Exception Value: 'ccEntry'
>>
>>
>> Request information
>>
>> USER
>>
>> AnonymousUser
>>
>> GET
>>
>> No GET data
>>
>> POST
>>
>> No POST data
>>
>> FILES
>>
>> No FILES data
>>
>>
>> On Thursday, March 7, 2019 at 2:50:00 PM UTC-5, Deepak Chhitarka wrote:
>>>
>>> In your home.html template, you forgot to write method="get" . Which I
>>> think is causing the problem here.
>>>
>>> On Fri 8 Mar, 2019, 12:03 AM Matthew Pava, <matthe...@iss.com> wrote:
>>>
>>>> Please just paste the error in the email message. The error message
>>>> that you have mentions a ‘method’ object, which is not present in the code
>>>> that you have sent to us. That would be where the problem is.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> *From:* django...@googlegroups.com [mailto:django...@googlegroups.com] *On
>>>> Behalf Of *drone4four
>>>> *Sent:* Thursday, March 7, 2019 11:29 AM
>>>> *To:* Django users
>>>> *Subject:* Re: Django credit card redaction app - -
>>>> MultiValueDictKeyError
>>>>
>>>>
>>>>
>>>> Thanks, Sam for the help.
>>>>
>>>>
>>>>
>>>> You wrote:
>>>>
>>>>
>>>>
>>>> I would be careful how you pass the data on get, somewhere in your
>>>> front end code you are probably not passing the data through as you
>>>> expected. Instead of using .GET, use .GET.get to get your data. This will
>>>> either return the value you want, or none.
>>>>
>>>>
>>>>
>>>> I looked up GET.get Django and found an SO post titled, “Django
>>>> request.GET
>>>> <https://stackoverflow.com/questions/3500859/django-request-get>”
>>>> which has quite a few up votes. Based on that SO answer, In my views.py I
>>>> changed the line (where I declare the number variable) from `number =
>>>> request.GET['ccEntry']` to `number = request.GET.get['ccEntry', None]`
>>>>
>>>>
>>>>
>>>> That gives a different error (a type error this time):
>>>> https://pastebin.com/L81LVtzi
>>>>
>>>>
>>>>
>>>> You also mentioned my front end. I had included the template in my
>>>> original post. I have since refined it so it is more readable. Here is my
>>>> improved home.html template:
>>>>
>>>>
>>>>
>>>> <html>
>>>>
>>>>
>>>>
>>>> <head>
>>>>
>>>> <title> Search </title>
>>>>
>>>> </head>
>>>>
>>>> <body>
>>>>
>>>> <center>
>>>>
>>>> <form action="{% url 'home' %}">
>>>>
>>>> <div>
>>>>
>>>> <h3>Enter your fake Chuckee Cheese Neptune credit card number!</h3>
>>>>
>>>> <input type="number" id="number" name="ccEntry" required placeholder
>>>> ="
>>>>
>>>
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