How to Query objects.filter ForeignKey

I'm trying to pass a objects.filter dictionary to HttpResponse. The problem is I have 2 models: InfoBox and InfoDetail. InfoDetail is linked to InfoBox by models.ForeignKey(InfoBox). What I want to do is filter by title which lives in the InfoBox model. I performed infobox = InfoDetail.objects.filter(title=info_title), but it returns an error cus 'title' doesn't live in InfoDetail.

How can i grab and filter it by title and pass {'infobox': infobox} in HttpResponse when HttpRequest is called?

Here's models: http://paste.ubuntu.com/1061144/

Here's views: http://paste.ubuntu.com/1061146/

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