508 lines
17 KiB
Python
508 lines
17 KiB
Python
from __future__ import unicode_literals
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import datetime
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import decimal
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from collections import defaultdict
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from django.contrib.auth import get_permission_codename
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from django.core.exceptions import FieldDoesNotExist
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from django.core.urlresolvers import reverse, NoReverseMatch
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from django.db import models
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from django.db.models.constants import LOOKUP_SEP
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from django.db.models.deletion import Collector
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from django.forms.forms import pretty_name
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from django.utils import formats, six, timezone
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from django.utils.encoding import force_str, force_text, smart_text
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from django.utils.html import conditional_escape, format_html
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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.translation import ungettext
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def lookup_needs_distinct(opts, lookup_path):
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"""
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Returns True if 'distinct()' should be used to query the given lookup path.
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"""
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field_name = lookup_path.split('__', 1)[0]
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field = opts.get_field(field_name)
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if hasattr(field, 'get_path_info') and any(path.m2m for path in field.get_path_info()):
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return True
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return False
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def prepare_lookup_value(key, value):
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"""
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Returns a lookup value prepared to be used in queryset filtering.
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"""
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# if key ends with __in, split parameter into separate values
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if key.endswith('__in'):
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value = value.split(',')
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# if key ends with __isnull, special case '' and the string literals 'false' and '0'
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if key.endswith('__isnull'):
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if value.lower() in ('', 'false', '0'):
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value = False
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else:
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value = True
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return value
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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 ':' and similarly problematic characters.
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Similar to urllib.quote, except that the quoting is slightly different so
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that it doesn't get automatically unquoted by the Web browser.
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"""
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if not isinstance(s, six.string_types):
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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(fields):
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"""Returns a list which is a single level of flattening of the
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original list."""
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flat = []
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for field in fields:
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if isinstance(field, (list, tuple)):
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flat.extend(field)
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else:
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flat.append(field)
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return flat
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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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field_names.extend(
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flatten(opts['fields'])
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)
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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 homogeneous 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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no_edit_link = '%s: %s' % (capfirst(opts.verbose_name),
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force_text(obj))
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if has_admin:
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try:
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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.model_name),
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None, (quote(obj._get_pk_val()),))
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except NoReverseMatch:
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# Change url doesn't exist -- don't display link to edit
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return no_edit_link
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p = '%s.%s' % (opts.app_label,
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get_permission_codename('delete', opts))
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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 format_html('{}: <a href="{}">{}</a>',
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capfirst(opts.verbose_name),
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admin_url,
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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 no_edit_link
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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, collector.model_count, 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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self.model_count = defaultdict(int)
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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=None, source_attr=None, **kwargs):
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for obj in objs:
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if source_attr and not source_attr.endswith('+'):
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related_name = source_attr % {
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'class': source._meta.model_name,
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'app_label': source._meta.app_label,
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}
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self.add_edge(getattr(obj, related_name), obj)
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else:
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self.add_edge(None, obj)
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self.model_count[obj._meta.verbose_name_plural] += 1
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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 as 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 can_fast_delete(self, *args, **kwargs):
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"""
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We always want to load the objects into memory so that we can display
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them to the user in confirm page.
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"""
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return False
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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_text(opts.verbose_name),
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'verbose_name_plural': force_text(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 = _get_non_gfk_field(opts, name)
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except 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
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hasattr(model_admin, name) and
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not name == '__str__' and
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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 _get_non_gfk_field(opts, name):
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"""
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For historical reasons, the admin app relies on GenericForeignKeys as being
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"not found" by get_field(). This could likely be cleaned up.
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"""
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field = opts.get_field(name)
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if field.is_relation and field.one_to_many and not field.related_model:
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raise FieldDoesNotExist()
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return field
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def label_for_field(name, model, model_admin=None, return_attr=False):
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"""
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Returns a sensible label for a field name. The name can be a callable,
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property (but not created with @property decorator) or the name of an
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object's attribute, as well as a genuine fields. If return_attr is
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True, the resolved attribute (which could be a callable) is also returned.
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This will be None if (and only if) the name refers to a field.
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"""
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attr = None
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try:
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field = _get_non_gfk_field(model._meta, name)
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try:
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label = field.verbose_name
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except AttributeError:
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# field is likely a ForeignObjectRel
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label = field.opts.verbose_name
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except FieldDoesNotExist:
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if name == "__unicode__":
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label = force_text(model._meta.verbose_name)
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attr = six.text_type
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elif name == "__str__":
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label = force_str(model._meta.verbose_name)
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attr = bytes
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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.__class__.__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 (isinstance(attr, property) and
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hasattr(attr, "fget") and
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hasattr(attr.fget, "short_description")):
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label = attr.fget.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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help_text = ""
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try:
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field = _get_non_gfk_field(model._meta, name)
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except FieldDoesNotExist:
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pass
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else:
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if hasattr(field, 'help_text'):
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help_text = field.help_text
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return smart_text(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.DateTimeField):
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return formats.localize(timezone.template_localtime(value))
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elif isinstance(field, (models.DateField, 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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elif isinstance(field, models.FileField):
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return mark_safe('<a href="%s">%s</a>' % (
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conditional_escape(value.url),
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conditional_escape(value),
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))
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else:
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return smart_text(value)
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def display_for_value(value, boolean=False):
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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 boolean:
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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(value, datetime.datetime):
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return formats.localize(timezone.template_localtime(value))
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elif isinstance(value, (datetime.date, datetime.time)):
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return formats.localize(value)
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elif isinstance(value, six.integer_types + (decimal.Decimal, float)):
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return formats.number_format(value)
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else:
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return smart_text(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 hasattr(field, 'get_path_info'):
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return field.get_path_info()[-1].to_opts.model
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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 = parent._meta.get_field(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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# Field should point to another model
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if field.is_relation and not (field.auto_created and not field.concrete):
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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.related_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(piece))
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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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get_limit_choices_to = (
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fields and hasattr(fields[-1], 'rel') and
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getattr(fields[-1].rel, 'get_limit_choices_to', None))
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if not get_limit_choices_to:
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return models.Q() # empty Q
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limit_choices_to = get_limit_choices_to()
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if 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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