Re: Am I missing a design pattern? My views code somehow isn't as elegant as it should be...

I'd say you're missing a service layer.

It's known as a good practice to not have "business rules" in your views.

IP lookup should be done in your view anyway, because it's a "web
related thing". The `save_the_lead()` and email sending should be in
the service layer.

Extending a little bit and talking about pythonic code,
`IPInfo.get_result()` should not exist. Simply use the `result`
attribute or convert it to a read only property. Or, if this class
came to life just because the `get_result()` method, convert it to a
simple function.




On 21 October 2016 at 09:11, Andrew Chiw <randomshinichi4869@gmail.com> wrote:
> In my views, I have this:
> def questionnaire(request):
> def save_the_lead(cleaned_data, ipinfo):
> email = cleaned_data.pop('email', None)
> lead, created = Lead.objects.update_or_create(email=email)
> lead.q = cleaned_data
> lead.ipinfo = ipinfo
> lead.save()
> return lead
>
> form = LeadForm(request.POST or request.GET or None)
> """
> Why am I still checking for request.method == "POST"?
> if POST (valid data) to questionnaire, process it.
> if GET (valid data) to questionnaire, display it first. Even if it's all
> valid.
> """
> if request.method == "POST":
> if form.is_valid():
> i = IPInfo(get_ip(request), dummy=True)
> lead = save_the_lead(form.cleaned_data, i.get_result())
> m = Matcher()
> m.match([lead])
> e = Emailer(lead)
> e.send()
> return redirect('results', lead.id)
>
> return render(request, 'wizard/questionnaire.html', {'form': form})
>
> And IPInfo looks like this:
> import requests
> import ipdb
>
>
> class IPInfo:
> def __init__(self, ip, dummy=False):
> self.result = dict()
> if (ip and not dummy):
> response = requests.get('http://ipinfo.io/' + ip)
> self.result = response.json()
> elif (ip and dummy):
> self.result = {"ip": ip}
>
> def get_result(self):
> return self.result
>
>
> The part I'm worried about is the IPInfo lookup class and how it is used in
> the view. I know you can mock classes in tests, but maybe I should use
> dependency injection instead? or is that not needed in Python?
> If I'm missing dependency injection: I don't have control over the code that
> runs before the view, so I cannot tell it to inject another instance of
> IPInfo in there.
>
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