Django note 3

6 Template The source I wrote earlier looks like this:

`views.py`


            ...
def current_datetime(request):
    now = datetime.datetime.now()
    html = "It is now %s." % now
    return HttpResponse(html)
            ...

Creating pages one by one is hard, and the source is also hard to write the front end.

So let's make a template

Template looks like this:

`index.html`


<!DOCTYPE html>
<html>
<head>
  <title>What's the time?</title>
</head>
<body>
  It is now {{ time }}.
</body>
</html>

It's a normal HTML-like source, but the part you want to switch to is in {{}}.

You can also realize simple logic. For example:

{% if user.gender == 'F' %}
   Hello
{% endif %}

{% for question in questions %}
    question.text
{% endfor %}

Rewrite views.py:

`views.py`


             ...
def current_datetime(request):
    now = datetime.datetime.now()
    data = {'now': now}
    #render(request,Template name,Parameters), Put the data in the template.
    return render(request, 'index.html', data)
             ...

7 Models The Django Model is in Models.py.

This shape:

`models.py`


from django.db import models
import django.utils.timezone as timezone

class Question(models.Model):
    text = models.CharField(max_length=100)
    uploadtime = models.DateTimeField('updated time', default = timezone.now)
                            ...

You can easily create a class and Django will automatically create a table for you.

When you want to use Question Model in views.js:

`views.py`


from .models import Question
import django.utils.timezone as timezone
from django.shortcuts import render

def index():
    #Get all the data from the database
    allQuestions = Question.objects.all().order_by('-uploadtime')
    now = timezone.now()
    data = {'questions': allQuestions, 'now': now}
    return render(request, 'index.html', data)

template

`index.html`


<!DOCTYPE html>
<html>
<head>
  <title>Exercise books</title>
</head>
<body>
  It is now {{ time }}.
  {% for question in questions %}
    question.text
    <br />
  {% endfor %}
</body>
</html>

`urls.py`


      ...
urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^hello/$', hello),
    url(r'^time/$', current_datetime),
    url(r'^index/$', index),
      ...
]

visit: http://127.0.0.1:8000/time/