循环Django模板中的对象列表

Question

似乎无法看到我在哪里出错了.原谅我,因为我是新手.我试图在模型中显示10个最新的对象.

这是我用来将所有这些对象放在列表中的循环:

 # put the top 10 newest Recipe objects in a list   
    entries_list = []
    all_recipes = Recipes.objects.annotate(Count('id'))
    newest_recipe_index = len(all_recipes)
    index = 0
    while index < 10:
        try:
            x = Recipes.objects.get(id=newest_recipe_index)
            entries_list.append(x)
            newest_recipe_index = newest_recipe_index - 1
            index = index + 1
        except:
            index = index + 1
            pass

然后我将其渲染到页面,如下所示:

 c = RequestContext(request, {'form' : form, 'entries_list' : entries_list})
    return render_to_response("main.html", c)

这是我的HTML:

{% for entries in entries_list %}
        <i><b>Name:</i></b> {{ entries_list.name }}<br>
        <img src="/images{{ entries_list.picture }}" height="300" width="300"></img><br>
        <i><b>Ingredients:</i></b> {{ entries_list.ingredients }}<br>
        <p><i>{{ entries_list.description }}</i></p>
        <i><b>Created by:</i></b> {{ entries_list.user }}<br><br>
    {% endfor %}

这是models.py:

class Recipes(models.Model):
    name = models.CharField(max_length=50)
    ingredients = models.CharField(max_length=300)
    picture = models.ImageField(upload_to = 'recipes/%Y/%m/%d')
    user = models.CharField(max_length=30)
    date = models.DateTimeField(auto_now=True)
    description = models.TextField()    
    comments = models.ManyToManyField(Comments)

似乎循环正在运行.那里有正确数量的条目.只是模板标签不起作用.他们只是空白.所以看起来这很好地将对象放在列表中,它只是不会检索我的单个字段.

Answer 1

有几件事.您可以通过这种方法订购查询,然后获取前十个条目.它比你拥有的循环更有效.

您的模板不起作用的原因是您指的是列表而不是单个条目.它应该是:

{% for entry in entries_list %}
        <i><b>Name:</i></b> {{ entry.name }}<br>
        <img src="/images{{ entry.picture }}" height="300" width="300"></img><br>
        <i><b>Ingredients:</i></b> {{ entry.ingredients }}<br>
        <p><i>{{ entry.description }}</i></p>
        <i><b>Created by:</i></b> {{ entry.user }}<br><br>
{% endfor %}

一旦模板工作,请尝试以获取您的entries_list:

entries_list = Recipes.objects.order_by('-id')[0:10]

这是关于排序和切片查询的文档:https: //docs.djangoproject.com/en/dev/topics/db/queries