博客基础_django_python从入门到实践_添加主题_添加条目_编辑条目

 要求及文件

　　用户可以添加新主题，添加新条目，以及编辑既有条目

 　　forms.py　　urls.py　　views.py　　html

　　 new_topic.html　　new_entry.html

 　　edit_entry.html

添加新主题

new_topic.html

 

topics.html

 

添加新条目

new_entry.html

 

topic.html

编辑条目

edit_entry.html

topic.html

代码

forms.py

from django import forms
from  .models import Topic, Entry

class TopicForm(forms.modelForm):
    def Meta:
        model = Topic
        text = ['text']
        labels = {'text': ''} # 不为字段生成标签

class EntryForm(forms.modelForm):
    def Meta:
        model = Entry
        text = ['text']
        labels = {'text': ''}
        widget = {'text': forms.Textarea(attrs={'cols': 80})}

urls.py

from django.conf.urls import url
from . import views

urlpatterns=[
    url(r'^$', views.index, name='index'),
    url(r'^topics/$', views.topics, name='topics'),
    url(r'^topics/(?P<topic_id>d+)/$', views.topic, name='topic'),
    url(r'^new_topic/$',views.new_topic, name='new_topic'),
    url(r'^new_entry/(?P<topic_id>d+)/$', views.new_entry, name='new_entry'),
    url(r'^edit_entry/(?P<entry_id>d+)/$', views.edit_entry, name='edit_entry'),
]

views.py

from django.shortcuts import render
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from .models import Topic, Entry
from .forms import TopicForm, EntryForm

# Create your views here.
def index(request):
    return render(request, 'learning_logs/index.html')

def topics(request):
    topics = Topic.objects.order_by('date_added')
    context = {'topics':topics}
    return render(request, 'learning_logs/topics.html', context)

def topic(request, topic_id):
    topic = Topic.objects.get(id=topic_id)
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic':topic, 'entries':entries}
    return render(request, 'learning_logs/topic.html', context)

def new_topic(request):
    if request.method != 'POST':
       form = TopicForm()
    else:
        form = TopicForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topics'))
    context = {'form': form}
    return render(request, 'learning_logs/new_topic.html', context)

def new_entry(request, topic_id):
    topic = Topic.objects.get(id=topic_id)
    if request.method != 'POST':
        form = EntryForm()
    else:
        form = EntryForm(request.POST)
        if form.is_valid():
            new_entry = form.save(commit=False)
            new_entry.topic = topic
            new_entry.save()
            return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic_id]))
    context = {'form': form, 'topic': topic}
return render(request, 'learning_logs/new_entry.html', context)

def edit_entry(request, entry_id):
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic
    if request.method != 'POST':
        form = EntryForm(instance=entry)
    else:
        form = EntryForm(instance=entry, data=request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic.id]))
    context = {'form':form, 'entry':entry, 'topic':topic}
    return render(request, 'learning_logs/edit_entry.html', context)

new_topic.html

{% extends 'learning_logs/base.html' %}
{% block content %}
    <p>add a new topic: </p>
    <form action="{% urls 'learning_logs:new_topic %}" method='post'>
        {% csrf_token %}
        {{ form.as_p }}
        <button name='submit'>add topic</button>
    </form>           
{% endblock content %}

topics.html

{% extends 'learning_logs/base.html' %}
{% block content %}
--snip
     <p><a href="{% url 'learning_logs:new_topic %}">Add a new topic</a></p>
{% endblock content %}

new_entry.html

% extends 'learning_logs/base.html' %}
{% block content %}
    <p><a href="{% url 'learning_logs:topic' topic.id %}">{{ topic }}</p>
    <p>Add a new entry:</p>
    <form action="{% url 'learning_logs:new_entry' topic.id %}" method='post'>
        {% csrf_token %}
        {{ form.as_p }}
        <button name='submit'>add entry</button>
    </form>
{% endblock content %}

edit_entry.html

{% extends 'learning_logs/base.html' %}

{% block content %}
    <p><a href="{% url 'learning_logs:topic' topic.id%}">{{ topic }}</a></p>
    <p>Edit entry: </p>
    <form action="{% url 'learning_logs:edit_entry' entry.id %}" method='post'>
        {% csrf_token %}
        {{ form.as_p }}
    <button name='submit'>save changes</button>
    </form>
{% endblock content %}

topic.html 

{% extends 'learning_logs/base.html' %}

{% block content %}
<p>Topic:{{ topic }}</p>
<p>Entries:</p>
<p>
    <a href="{% url 'learning_logs:new_entry' topic.id%}">add new entry</a>
</p>
<ul>
    {% for entry in entries %}
        <li>
            <p>{{ entry.date_added|date:'M d, Y H:i' }}</p>
            <p>{{ entry.text|linebreaks }}</p>
        </li>
        <p>
            <a href="{% url 'learning_logs:edit_entry' entry.id %}">edit entry</a>
        </p>
    {% empty %}
        There are no entries for this topic yet.
    {% endfor %}
</ul>
{% endblock content %}