Overview

This article walks you through the steps of a beginner developing a coupon distribution service for the iPhone with a RESTful API and swift. It is a very detour implementation because it was implemented while examining the technical elements one by one.

This time [try running python in Django environment made with pipenv] In the environment created by (https://qiita.com/Ajyarimochi/items/0964d314c8bd968fcc80), create a simple web API using Django's functions.

reference

Python Django Super Introductory by Yano Palm Tatsu Shuwa System
Explanation of Web API

environment

Mac OS 10.15 VSCode 1.39.2 pipenv 2018.11.26 Python 3.7.4 Django 2.2.6

web API specifications

When a coupon code is requested, the content of the coupon associated with the coupon code is responded by HTTP.

Request parameter: coupon_code
If you specify 0001 for coupon_code, the character string "1000 yen discount coupon!" Will be returned.
If you specify 0002 for coupon_code, the character string "10% discount coupon!" Will be returned.
If you do not specify a code or enter a code that does not exist, the string "Error: Not found coupon code!" Is returned.

procedure

Create a coupon django app
Implemented response processing in views.py
Create urls.py under coupon app
Edit urls.py under the project
Operation check

Create a coupon django app

Enter the pipenv virtual environment with the pipenv shell command and change to the directory where manage.py is located.

Create a django app named coupon.

If you open the folder with VS Code, you will have a coupon app.

Implemented response processing in views.py

As shown below, I created a function called coupon and hard-coded the contents of the coupon. Depending on the code of the coupon sent by the request variable (coupon_code), the coupon will be sorted by the if statement. The response is returned in Http using Django's HttpResponse method.

`views.py`


from django.shortcuts import render
from django.http import HttpResponse

# Create your views here.
def coupon(request):
    if 'coupon_code' in request.GET:
        coupon_code = request.GET['coupon_code']
        if coupon_code == '0001':
        　　result = '1000 yen discount coupon!'
        elif coupon_code == '0002':
            result = '10%Discount coupon!'
        else:
            result = 'Error:Not found coupon code!'
        return HttpResponse(result)

Create urls.py under coupon app

Next, set the path. First, create a new ʻurls.py` under the coupon app.

`coupon/urls.py`


from django.urls import path
from . import views

urlpatterns = [
    path('', views.coupon, name='coupon'),
]

Edit urls.py under the project

Next, edit urls.py under the project. Added path ('coupon /', include ('coupon.urls')) to ʻurl patterns`.

`ami_coupon_api/urls.py`


from django.contrib import admin
from django.urls import path,include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('hello/', include('hello.urls')),
    path('coupon/', include('coupon.urls'))
]

Operation check

Save your changes and start django's web server.

$ python manage.py runserver

Access the following URL with a browser. http://127.0.0.1:8000/coupon/?coupon_code=0001 Confirm that the correct response changes.

Check the pattern for entering other parameters

Request a coupon with coupon code 0002 http://127.0.0.1:8000/coupon/?coupon_code=0002

If you specify a coupon code that does not exist http://127.0.0.1:8000/coupon/?coupon_code=0003

With the above, we have implemented a super-simple web API. From here, we will modify it as follows to make it a web API that can withstand practical use.

Respond in Json format
Manage coupon information in DB instead of hard coding
Remodel to Rest full API

Next time, I'll try using Django's template feature for learning [https://qiita.com/Ajyarimochi/items/9d64b13321f0779fc986)

[PYTHON] (For beginners) Try creating a simple web API with Django