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2013-05-07T04:06:45.647
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Here's a useful custom template tag for constructing query strings. <pre><code><a href="?{% make_query_string page=obj_list.next_page_number %}">Next page</a> </code></pre> If the URL is <a href="http://example.com/django/page/?search=sometext" rel="nofollow">http://example.com/django/page/?search=sometext</a>, the generated HTML should be something like: <pre><code><a href="?search=sometext&page=2">Next page</a> </code></pre> More examples: <pre><code>   {% make_query_string page=2 item="foo2" size=10 %}   {% make_query_string item+="foo2" item+="bar2" %}   {% make_query_string item-="foo" %}   {% make_query_string item= %}  </code></pre> Finally, the source code (written by me): <pre><code># -*- coding: utf-8 -*- from django import template from django.utils.encoding import force_text # Django 1.5+ only register = template.Library() class QueryStringNode(template.Node): def __init__(self, tag_name, parsed_args, var_name=None, silent=False): self.tag_name = tag_name self.parsed_args = parsed_args self.var_name = var_name self.silent = silent def render(self, context): # django.core.context_processors.request should be enabled in # settings.TEMPLATE_CONTEXT_PROCESSORS. # Or else, directly pass the HttpRequest object as 'request' in context. query_dict = context['request'].GET.copy() for op, key, value in self.parsed_args: if op == '+': query_dict.appendlist(key, value.resolve(context)) elif op == '-': list_ = query_dict.getlist(key) value_ = value.resolve(context) try: list_.remove(value_) except ValueError: # Value not found if not isinstance(value_, basestring): # Try to convert it to unicode, and try again try: list_.remove(force_text(value_)) except ValueError: pass elif op == 'd': try: del query_dict[key] except KeyError: pass else: query_dict[key] = value.resolve(context) query_string = query_dict.urlencode() if self.var_name: context[self.var_name] = query_string if self.silent: return '' return query_string @register.tag def make_query_string(parser, token): # {% make_query_string page=1 size= item+="foo" item-="bar" as foo [silent] %} args = token.split_contents() tag_name = args[0] as_form = False if len(args) > 3 and args[-3] == "as": # {% x_make_query_string ... as foo silent %} case. if args[-1] != "silent": raise template.TemplateSyntaxError( "Only 'silent' flag is allowed after %s's name, not '%s'." % (tag_name, args[-1])) as_form = True silent = True args = args[:-1] elif len(args) > 2 and args[-2] == "as": # {% x_make_query_string ... as foo %} case. as_form = True silent = False if as_form: var_name = args[-1] raw_pairs = args[1:-2] else: raw_pairs = args[1:] parsed_args = [] for pair in raw_pairs: try: arg, raw_value = pair.split('=', 1) except ValueError: raise template.TemplateSyntaxError( "%r tag's argument should be in format foo=bar" % tag_name) operator = arg[-1] if operator == '+': # item+="foo": Append to current query arguments. # e.g. item=1 -> item=1&item=foo parsed_args.append(('+', arg[:-1], parser.compile_filter(raw_value))) elif operator == '-': # item-="bar": Remove from current query arguments. # e.g. item=1&item=bar -> item=1 parsed_args.append(('-', arg[:-1], parser.compile_filter(raw_value))) elif raw_value == '': # item=: Completely remove from current query arguments. # e.g. item=1&item=2 -> '' parsed_args.append(('d', arg, None)) else: # item=1: Replace current query arguments, e.g. item=2 -> item=1 parsed_args.append(('', arg, parser.compile_filter(raw_value))) if as_form: node = QueryStringNode(tag_name, parsed_args, var_name=var_name, silent=silent) else: node = QueryStringNode(tag_name, parsed_args) return node </code></pre>
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.