524 lines
18 KiB
Python
524 lines
18 KiB
Python
import datetime
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import decimal
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import re
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from collections import defaultdict
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from django.core.exceptions import FieldDoesNotExist
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from django.db import models, router
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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.utils import pretty_name
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from django.urls import NoReverseMatch, reverse
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from django.utils import formats, timezone
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from django.utils.html import format_html
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from django.utils.text import capfirst
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from django.utils.translation import ngettext, override as translation_override
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QUOTE_MAP = {i: '_%02X' % i for i in b'":/_#?;@&=+$,"[]<>%\n\\'}
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UNQUOTE_MAP = {v: chr(k) for k, v in QUOTE_MAP.items()}
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UNQUOTE_RE = re.compile('_(?:%s)' % '|'.join([x[1:] for x in UNQUOTE_MAP]))
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class FieldIsAForeignKeyColumnName(Exception):
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"""A field is a foreign key attname, i.e. <FK>_id."""
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pass
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def lookup_needs_distinct(opts, lookup_path):
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"""
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Return True if 'distinct()' should be used to query the given lookup path.
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"""
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lookup_fields = lookup_path.split(LOOKUP_SEP)
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# Go through the fields (following all relations) and look for an m2m.
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for field_name in lookup_fields:
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if field_name == 'pk':
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field_name = opts.pk.name
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try:
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field = opts.get_field(field_name)
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except FieldDoesNotExist:
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# Ignore query lookups.
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continue
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else:
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if hasattr(field, 'get_path_info'):
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# This field is a relation; update opts to follow the relation.
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path_info = field.get_path_info()
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opts = path_info[-1].to_opts
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if any(path.m2m for path in path_info):
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# This field is a m2m relation so distinct must be called.
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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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Return 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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elif key.endswith('__isnull'):
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value = value.lower() not in ('', 'false', '0')
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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.parse.quote(), except that the quoting is slightly
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different so that it doesn't get automatically unquoted by the Web browser.
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"""
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return s.translate(QUOTE_MAP) if isinstance(s, str) else s
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def unquote(s):
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"""Undo the effects of quote()."""
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return UNQUOTE_RE.sub(lambda m: UNQUOTE_MAP[m.group(0)], s)
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def flatten(fields):
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"""
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Return a list which is a single level of flattening of the original list.
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"""
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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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"""Return 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, request, admin_site):
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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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Return 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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try:
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obj = objs[0]
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except IndexError:
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return [], {}, set(), []
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else:
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using = router.db_for_write(obj._meta.model)
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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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model = obj.__class__
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has_admin = model in admin_site._registry
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opts = obj._meta
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no_edit_link = '%s: %s' % (capfirst(opts.verbose_name), obj)
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if has_admin:
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if not admin_site._registry[model].has_delete_permission(request, obj):
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perms_needed.add(opts.verbose_name)
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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.pk),))
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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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# 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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model_count = {model._meta.verbose_name_plural: len(objs) for model, objs in collector.model_objs.items()}
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return to_delete, 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().__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_objs = defaultdict(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=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_objs[obj._meta.model].add(obj)
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try:
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return super().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().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': opts.verbose_name,
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'verbose_name_plural': 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 ngettext(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, FieldIsAForeignKeyColumnName):
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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 hasattr(model_admin, name) and name != '__str__':
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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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Reverse relations should also be excluded as these aren't attributes of the
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model (rather something like `foo_set`).
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"""
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field = opts.get_field(name)
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if (field.is_relation and
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# Generic foreign keys OR reverse relations
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((field.many_to_one and not field.related_model) or field.one_to_many)):
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raise FieldDoesNotExist()
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# Avoid coercing <FK>_id fields to FK
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if field.is_relation and not field.many_to_many and hasattr(field, 'attname') and field.attname == name:
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raise FieldIsAForeignKeyColumnName()
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return field
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def label_for_field(name, model, model_admin=None, return_attr=False, form=None):
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"""
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Return 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 model field. If return_attr is True, also
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return the resolved attribute (which could be a callable). This will be
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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.related_model._meta.verbose_name
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except FieldDoesNotExist:
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if name == "__str__":
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label = str(model._meta.verbose_name)
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attr = str
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else:
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if callable(name):
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attr = name
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elif 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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elif form and name in form.fields:
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attr = form.fields[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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if form:
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message += " or %s" % form.__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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except FieldIsAForeignKeyColumnName:
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label = pretty_name(name)
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attr = 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, FieldIsAForeignKeyColumnName):
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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 help_text
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def display_for_field(value, field, empty_value_display):
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from django.contrib.admin.templatetags.admin_list import _boolean_icon
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if getattr(field, 'flatchoices', None):
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return dict(field.flatchoices).get(value, empty_value_display)
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# BooleanField needs special-case null-handling, so it comes before the
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# general null test.
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elif isinstance(field, models.BooleanField):
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return _boolean_icon(value)
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elif value is None:
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return empty_value_display
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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.IntegerField, models.FloatField)):
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return formats.number_format(value)
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elif isinstance(field, models.FileField) and value:
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return format_html('<a href="{}">{}</a>', value.url, value)
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else:
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return display_for_value(value, empty_value_display)
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def display_for_value(value, empty_value_display, boolean=False):
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from django.contrib.admin.templatetags.admin_list import _boolean_icon
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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_value_display
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elif isinstance(value, bool):
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return str(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, (int, decimal.Decimal, float)):
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return formats.number_format(value)
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elif isinstance(value, (list, tuple)):
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return ', '.join(str(v) for v in value)
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else:
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return str(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.remote_field.model
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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 construct_change_message(form, formsets, add):
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"""
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Construct a JSON structure describing changes from a changed object.
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Translations are deactivated so that strings are stored untranslated.
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Translation happens later on LogEntry access.
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"""
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change_message = []
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if add:
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change_message.append({'added': {}})
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elif form.changed_data:
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change_message.append({'changed': {'fields': form.changed_data}})
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if formsets:
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with translation_override(None):
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for formset in formsets:
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for added_object in formset.new_objects:
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change_message.append({
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'added': {
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'name': str(added_object._meta.verbose_name),
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'object': str(added_object),
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}
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})
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for changed_object, changed_fields in formset.changed_objects:
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change_message.append({
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'changed': {
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'name': str(changed_object._meta.verbose_name),
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'object': str(changed_object),
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'fields': changed_fields,
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}
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})
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for deleted_object in formset.deleted_objects:
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change_message.append({
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'deleted': {
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'name': str(deleted_object._meta.verbose_name),
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'object': str(deleted_object),
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}
|
|
})
|
|
return change_message
|