Django 1.5.4 专题11 file uploading and updating database schema

一.修改settings.py 的内容如下

二.修改article/models.py的内容如下

from django.db import modelsfrom time import timedef get_upload_file_name(instance,filename):    return "upload_files/%s_%s" % (str(time()).replace('.','_'),filename)# Create your models here.class Article(models.Model):    title       =models.CharField(max_length=200)    body        =models.TextField()    pub_date    =models.DateTimeField('date published')    likes       =models.IntegerField()    thumbnail   =models.FileField(upload_to=get_upload_file_name)    def __unicode__(self):        return self.titleclass Comment(models.Model):    name    =models.CharField(max_length=200)    body    =models.TextField()    pub_date = models.DateTimeField('date published')    article  = models.ForeignKey(Article)

三.修改article/forms.py的内容如下

from django import formsfrom models import Article,Commentclass ArticleForm(forms.ModelForm):    class Meta:        model=Article        fields=('title','body','pub_date','thumbnail')class CommentForm(forms.ModelForm):    class Meta:        model=Comment        fields=('name','body')

四.修改article/templates/article.html

{% extends "base.html" %}{% block sidebar %}<ul>    <li><a href="/articles/all">Articles</a></li></ul>{% endblock %}{% block content %}<h1> {{ article.title }} </h1><p> {{ article.body }} </p>{% if artilce.thumbnail %}    <p><img src="/static/assets/{{article.thumbnail}}" width="200"></p>{% endif %}<p> <a> {{ article.likes }} people liked this article </a> </p><p><a href="/articles/like/{{article.id}}">Like</a></p><h2>Comment</h2>{% for c in article.comment_set.all %}<p>{{c.name}}:{{c.body}}</p>{% endfor %}<p><a href="/articles/add_comment/{{article.id}}">Add Comment</a></p>{% endblock %}

五.修改article/templates/create_article.html的内容如下

{% extends "base.html" %}{% block sidebar %}<ul>    <li><a href="/articles/all">Cancel</a></li></ul>{% endblock %}{% block content %}<form action="/articles/create/" method="post" enctype="multipart/form-data">{% csrf_token %}    <ul> {{ form.as_ul}} </ul>    <input type="submit" name="submit" value="Create Article"></form>{% endblock %}

六.修改article/views.py的内容如下

def create(request):    if request.POST:        form=ArticleForm(request.POST,request.FILES)        if form.is_valid():            form.save()            return HttpResponseRedirect('/articles/all')    else:        form=ArticleForm()    args={}    args.update(csrf(request))    args['form']=form    return render_to_response('create_article.html',args)

七.转换数据库后端时导入初始数据执行

    syncdb 并 不能将模型的修改或删除同步到数据库；如果你修改或删除了一个模型，并想把它提交到数据库，syncdb并不会做出任何处理,所以要导出数据,再导入数据

    python manage.py dumpdata article --indent=4 >article.json

    python manage.py reset article; 清除数据

    python manage.py loaddata article.json 导入json数据

八.最终效果如下