How can I judge the object if is exists in the templates? - django

Question

In the template:
<h4>
{% if data.wine_one %}
{{ data.wine_one.title }}
{% elif data.news_one %}
{{ data.news_one.title }}
{% endif %}
</h4>
I promise the data.wine_one is exists, because in the views.py I have print out it.
But in the templates it do not shows up the data.wine_one.title, and I use the data.wine_one != None can not judge it too.
EDIT
In the views.py:
def getData():
banner = models.Banner.objects.filter(fk_info=1)
info = models.Info.objects.all().first()
aboutus = models.AboutUs.objects.all().first()
winery = models.Winery.objects.all()[:3]
winery_consult = models.WineryConsult.objects.all()[:4]
data = {
'banner': banner,
'info': info,
'aboutus': aboutus,
'winery': winery,
'winery_consult': winery_consult,
}
return data
def productdetails(request, nid):
data = getData()
wine_one = models.Winery.objects.filter(id=nid).first()
data['wine_one'] = wine_one
print (data['wine_one'].title) # there ouput the "gaoliangjiu"
return render(request, 'article_list_content.html', data)

Answer 1

You've misunderstood how the template context works.
There's no element called data in the template; that's just the local variable you're using in the view to build up the context. In the template, you just reference the keys of that object directly. So it should be:
{% if wine_one %}
{{ wine_one.title }}
{% elif news_one %}
{{ news_one.title }}
{% endif %}