389 lines
13 KiB
Python
389 lines
13 KiB
Python
from django.db import models
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from django.db.models.sql.constants import LOOKUP_SEP
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from django.db.models.deletion import Collector
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from django.db.models.related import RelatedObject
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from django.forms.forms import pretty_name
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from django.utils import formats
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from django.utils.html import escape
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from django.utils.safestring import mark_safe
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from django.utils.text import capfirst
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from django.utils.encoding import force_unicode, smart_unicode, smart_str
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from django.utils.translation import ungettext
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from django.core.urlresolvers import reverse, NoReverseMatch
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from django.utils.datastructures import SortedDict
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def quote(s):
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"""
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Ensure that primary key values do not confuse the admin URLs by escaping
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any '/', '_' and ':' characters. Similar to urllib.quote, except that the
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quoting is slightly different so that it doesn't get automatically
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unquoted by the Web browser.
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"""
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if not isinstance(s, basestring):
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return s
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res = list(s)
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for i in range(len(res)):
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c = res[i]
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if c in """:/_#?;@&=+$,"<>%\\""":
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res[i] = '_%02X' % ord(c)
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return ''.join(res)
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def unquote(s):
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"""
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Undo the effects of quote(). Based heavily on urllib.unquote().
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"""
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mychr = chr
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myatoi = int
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list = s.split('_')
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res = [list[0]]
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myappend = res.append
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del list[0]
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for item in list:
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if item[1:2]:
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try:
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myappend(mychr(myatoi(item[:2], 16)) + item[2:])
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except ValueError:
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myappend('_' + item)
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else:
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myappend('_' + item)
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return "".join(res)
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def flatten_fieldsets(fieldsets):
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"""Returns a list of field names from an admin fieldsets structure."""
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field_names = []
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for name, opts in fieldsets:
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for field in opts['fields']:
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# type checking feels dirty, but it seems like the best way here
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if type(field) == tuple:
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field_names.extend(field)
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else:
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field_names.append(field)
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return field_names
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def get_deleted_objects(objs, opts, user, admin_site, using):
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"""
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Find all objects related to ``objs`` that should also be deleted. ``objs``
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must be a homogenous iterable of objects (e.g. a QuerySet).
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Returns a nested list of strings suitable for display in the
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template with the ``unordered_list`` filter.
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"""
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collector = NestedObjects(using=using)
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collector.collect(objs)
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perms_needed = set()
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def format_callback(obj):
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has_admin = obj.__class__ in admin_site._registry
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opts = obj._meta
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if has_admin:
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admin_url = reverse('%s:%s_%s_change'
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% (admin_site.name,
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opts.app_label,
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opts.object_name.lower()),
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None, (quote(obj._get_pk_val()),))
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p = '%s.%s' % (opts.app_label,
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opts.get_delete_permission())
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if not user.has_perm(p):
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perms_needed.add(opts.verbose_name)
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# Display a link to the admin page.
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return mark_safe(u'%s: <a href="%s">%s</a>' %
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(escape(capfirst(opts.verbose_name)),
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admin_url,
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escape(obj)))
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else:
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# Don't display link to edit, because it either has no
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# admin or is edited inline.
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return u'%s: %s' % (capfirst(opts.verbose_name),
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force_unicode(obj))
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to_delete = collector.nested(format_callback)
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protected = [format_callback(obj) for obj in collector.protected]
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return to_delete, perms_needed, protected
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class NestedObjects(Collector):
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def __init__(self, *args, **kwargs):
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super(NestedObjects, self).__init__(*args, **kwargs)
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self.edges = {} # {from_instance: [to_instances]}
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self.protected = set()
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def add_edge(self, source, target):
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self.edges.setdefault(source, []).append(target)
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def collect(self, objs, source_attr=None, **kwargs):
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for obj in objs:
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if source_attr:
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self.add_edge(getattr(obj, source_attr), obj)
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else:
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self.add_edge(None, obj)
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try:
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return super(NestedObjects, self).collect(objs, source_attr=source_attr, **kwargs)
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except models.ProtectedError, e:
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self.protected.update(e.protected_objects)
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def related_objects(self, related, objs):
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qs = super(NestedObjects, self).related_objects(related, objs)
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return qs.select_related(related.field.name)
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def _nested(self, obj, seen, format_callback):
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if obj in seen:
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return []
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seen.add(obj)
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children = []
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for child in self.edges.get(obj, ()):
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children.extend(self._nested(child, seen, format_callback))
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if format_callback:
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ret = [format_callback(obj)]
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else:
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ret = [obj]
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if children:
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ret.append(children)
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return ret
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def nested(self, format_callback=None):
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"""
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Return the graph as a nested list.
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"""
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seen = set()
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roots = []
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for root in self.edges.get(None, ()):
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roots.extend(self._nested(root, seen, format_callback))
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return roots
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def model_format_dict(obj):
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"""
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Return a `dict` with keys 'verbose_name' and 'verbose_name_plural',
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typically for use with string formatting.
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`obj` may be a `Model` instance, `Model` subclass, or `QuerySet` instance.
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"""
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if isinstance(obj, (models.Model, models.base.ModelBase)):
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opts = obj._meta
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elif isinstance(obj, models.query.QuerySet):
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opts = obj.model._meta
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else:
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opts = obj
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return {
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'verbose_name': force_unicode(opts.verbose_name),
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'verbose_name_plural': force_unicode(opts.verbose_name_plural)
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}
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def model_ngettext(obj, n=None):
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"""
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Return the appropriate `verbose_name` or `verbose_name_plural` value for
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`obj` depending on the count `n`.
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`obj` may be a `Model` instance, `Model` subclass, or `QuerySet` instance.
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If `obj` is a `QuerySet` instance, `n` is optional and the length of the
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`QuerySet` is used.
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"""
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if isinstance(obj, models.query.QuerySet):
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if n is None:
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n = obj.count()
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obj = obj.model
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d = model_format_dict(obj)
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singular, plural = d["verbose_name"], d["verbose_name_plural"]
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return ungettext(singular, plural, n or 0)
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def lookup_field(name, obj, model_admin=None):
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opts = obj._meta
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try:
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f = opts.get_field(name)
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except models.FieldDoesNotExist:
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# For non-field values, the value is either a method, property or
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# returned via a callable.
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if callable(name):
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attr = name
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value = attr(obj)
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elif (model_admin is not None and hasattr(model_admin, name) and
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not name == '__str__' and not name == '__unicode__'):
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attr = getattr(model_admin, name)
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value = attr(obj)
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else:
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attr = getattr(obj, name)
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if callable(attr):
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value = attr()
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else:
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value = attr
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f = None
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else:
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attr = None
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value = getattr(obj, name)
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return f, attr, value
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def label_for_field(name, model, model_admin=None, return_attr=False):
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attr = None
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try:
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field = model._meta.get_field_by_name(name)[0]
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if isinstance(field, RelatedObject):
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label = field.opts.verbose_name
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else:
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label = field.verbose_name
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except models.FieldDoesNotExist:
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if name == "__unicode__":
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label = force_unicode(model._meta.verbose_name)
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elif name == "__str__":
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label = smart_str(model._meta.verbose_name)
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else:
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if callable(name):
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attr = name
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elif model_admin is not None and hasattr(model_admin, name):
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attr = getattr(model_admin, name)
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elif hasattr(model, name):
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attr = getattr(model, name)
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else:
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message = "Unable to lookup '%s' on %s" % (name, model._meta.object_name)
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if model_admin:
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message += " or %s" % (model_admin.__name__,)
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raise AttributeError(message)
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if hasattr(attr, "short_description"):
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label = attr.short_description
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elif callable(attr):
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if attr.__name__ == "<lambda>":
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label = "--"
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else:
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label = pretty_name(attr.__name__)
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else:
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label = pretty_name(name)
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if return_attr:
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return (label, attr)
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else:
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return label
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def help_text_for_field(name, model):
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try:
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help_text = model._meta.get_field_by_name(name)[0].help_text
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except models.FieldDoesNotExist:
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help_text = ""
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return smart_unicode(help_text)
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def display_for_field(value, field):
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from django.contrib.admin.templatetags.admin_list import _boolean_icon
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from django.contrib.admin.views.main import EMPTY_CHANGELIST_VALUE
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if field.flatchoices:
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return dict(field.flatchoices).get(value, EMPTY_CHANGELIST_VALUE)
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# NullBooleanField needs special-case null-handling, so it comes
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# before the general null test.
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elif isinstance(field, models.BooleanField) or isinstance(field, models.NullBooleanField):
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return _boolean_icon(value)
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elif value is None:
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return EMPTY_CHANGELIST_VALUE
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elif isinstance(field, models.DateField) or isinstance(field, models.TimeField):
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return formats.localize(value)
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elif isinstance(field, models.DecimalField):
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return formats.number_format(value, field.decimal_places)
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elif isinstance(field, models.FloatField):
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return formats.number_format(value)
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else:
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return smart_unicode(value)
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class NotRelationField(Exception):
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pass
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def get_model_from_relation(field):
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if isinstance(field, models.related.RelatedObject):
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return field.model
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elif getattr(field, 'rel'): # or isinstance?
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return field.rel.to
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else:
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raise NotRelationField
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def reverse_field_path(model, path):
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""" Create a reversed field path.
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E.g. Given (Order, "user__groups"),
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return (Group, "user__order").
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Final field must be a related model, not a data field.
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"""
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reversed_path = []
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parent = model
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pieces = path.split(LOOKUP_SEP)
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for piece in pieces:
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field, model, direct, m2m = parent._meta.get_field_by_name(piece)
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# skip trailing data field if extant:
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if len(reversed_path) == len(pieces)-1: # final iteration
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try:
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get_model_from_relation(field)
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except NotRelationField:
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break
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if direct:
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related_name = field.related_query_name()
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parent = field.rel.to
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else:
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related_name = field.field.name
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parent = field.model
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reversed_path.insert(0, related_name)
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return (parent, LOOKUP_SEP.join(reversed_path))
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def get_fields_from_path(model, path):
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""" Return list of Fields given path relative to model.
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e.g. (ModelX, "user__groups__name") -> [
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<django.db.models.fields.related.ForeignKey object at 0x...>,
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<django.db.models.fields.related.ManyToManyField object at 0x...>,
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<django.db.models.fields.CharField object at 0x...>,
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]
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"""
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pieces = path.split(LOOKUP_SEP)
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fields = []
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for piece in pieces:
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if fields:
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parent = get_model_from_relation(fields[-1])
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else:
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parent = model
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fields.append(parent._meta.get_field_by_name(piece)[0])
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return fields
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def remove_trailing_data_field(fields):
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""" Discard trailing non-relation field if extant. """
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try:
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get_model_from_relation(fields[-1])
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except NotRelationField:
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fields = fields[:-1]
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return fields
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def get_limit_choices_to_from_path(model, path):
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""" Return Q object for limiting choices if applicable.
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If final model in path is linked via a ForeignKey or ManyToManyField which
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has a `limit_choices_to` attribute, return it as a Q object.
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"""
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fields = get_fields_from_path(model, path)
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fields = remove_trailing_data_field(fields)
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limit_choices_to = (
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fields and hasattr(fields[-1], 'rel') and
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getattr(fields[-1].rel, 'limit_choices_to', None))
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if not limit_choices_to:
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return models.Q() # empty Q
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elif isinstance(limit_choices_to, models.Q):
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return limit_choices_to # already a Q
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else:
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return models.Q(**limit_choices_to) # convert dict to Q
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