Web Development with Django Cookbook Second Edition by Unknown

Author:Unknown
Language: eng
Format: mobi
Publisher: Packt Publishing

Then, let's create the {% add_to_query %} template tag:@register.simple_tag(takes_context=True) def add_to_query( context, *params_to_remove, **params_to_add ): """ Renders a link with modified current query parameters """ query_params = [] # go through current query params.. for key, value_list in \ context["request"].GET._iterlists(): if not key in params_to_remove: # don't add key-value pairs which already # exist in the query if key in params_to_add and \ unicode(params_to_add[key]) in value_list: params_to_add.pop(key) for value in value_list: query_params.append((key, value)) # add the rest key-value pairs for key, value in params_to_add.items(): query_params.append((key, value)) # empty values will be removed query_string = context["request"].path if len(query_params): query_string += "?%s" % urllib.urlencode([ (key, force_str(value)) for (key, value) in query_params if value ]).replace("&", "&") return query_string

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