django - other_dict 必须是一个映射(类字典)对象

Question

我有以下上下文处理器:

def btc_price(request):
    price = get_price()
    return {'btc_price', price}

如果重要，这是我的 get_price 函数:

def get_price():
    now = datetime.datetime.now()
    if PriceCache.objects.all().exists():
        last_fetch = PriceCache.objects.latest('time_fetched')
        time_last_fetched = last_fetch.time_fetched
        day = datetime.timedelta(days=1)

        if now - time_last_fetched > day:
            api_url = urllib2.Request("https://www.bitstamp.net/api/ticker/")
            opener = urllib2.build_opener()
            f = opener.open(api_url)
            fetched_json = json.loads(f.read())
            cost_of_btc = fetched_json['last']

            PriceCache.objects.create(price=cost_of_btc, time_fetched=now)
            last_fetch.delete()
            return cost_of_btc
        else:
            return last_fetch.price
    else:
        api_url = urllib2.Request("https://www.bitstamp.net/api/ticker/")
        opener = urllib2.build_opener()
        f = opener.open(api_url)
        fetched_json = json.loads(f.read())
        cost_of_btc = fetched_json['last']

        PriceCache.objects.create(price=cost_of_btc, time_fetched=now)
    return cost_of_btc

我已经在 TEMPLATE_CONTEXT_PROCESSORS 中声明了上下文处理器，它看起来像:

TEMPLATE_CONTEXT_PROCESSORS = (
"django.contrib.auth.context_processors.auth",
"django.core.context_processors.debug",
"django.core.context_processors.i18n",
"django.core.context_processors.media",
"django.core.context_processors.request",
"Computer_store.processors.btc_price",
)

并且在我的 render_to_response 函数中正确定义了请求上下文。

return render_to_response('home.html', {}, context_instance = RequestContext(request))

但是，当我尝试在主页上运行此代码时，出现一个奇怪的错误。TypeError at / other_dict must be a mapping (dictionary-like) object.
完整的回溯可用 here 。

Answer 1

看起来像

return {'btc_price', price}

应该变成:

return {'btc_price': price}