Mastering Django: Core

QueryDict objects

In an HttpRequest object, the GET and POST attributes are instances of django.http.QueryDict, a dictionary-like class customized to deal with multiple values for the same key. This is necessary because some HTML form elements, notably <select multiple>, pass multiple values for the same key.

The QueryDicts at request.POST and request.GET will be immutable when accessed in a normal request/response cycle. To get a mutable version you need to use .copy().

Methods

QueryDict implements all the standard dictionary methods because it's a subclass of dictionary, with the following exceptions.

QueryDict.__init__()

Instantiates a QueryDict object based on query_string.

>>> QueryDict('a=1&a=2&c=3') <QueryDict: {'a': ['1', '2'], 'c': ['3']}> ...