/
document.py
1022 lines (880 loc) · 38.9 KB
/
document.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
import copy
import operator
import numbers
from collections import Hashable
from functools import partial
import pymongo
from bson import json_util, ObjectId
from bson.dbref import DBRef
from bson.son import SON
from mongoengine import signals
from mongoengine.common import _import_class
from mongoengine.errors import (ValidationError, InvalidDocumentError,
LookUpError, FieldDoesNotExist)
from mongoengine.python_support import PY3, txt_type
from mongoengine.base.common import get_document, ALLOW_INHERITANCE
from mongoengine.base.datastructures import (
BaseDict,
BaseList,
EmbeddedDocumentList,
StrictDict,
SemiStrictDict
)
from mongoengine.base.fields import ComplexBaseField
__all__ = ('BaseDocument', 'NON_FIELD_ERRORS')
NON_FIELD_ERRORS = '__all__'
class BaseDocument(object):
__slots__ = ('_changed_fields', '_initialised', '_created', '_data',
'_dynamic_fields', '_auto_id_field', '_db_field_map', '__weakref__')
_dynamic = False
_dynamic_lock = True
STRICT = False
def __init__(self, *args, **values):
"""
Initialise a document or embedded document
:param __auto_convert: Try and will cast python objects to Object types
:param values: A dictionary of values for the document
"""
self._initialised = False
self._created = True
if args:
# Combine positional arguments with named arguments.
# We only want named arguments.
field = iter(self._fields_ordered)
# If its an automatic id field then skip to the first defined field
if self._auto_id_field:
next(field)
for value in args:
name = next(field)
if name in values:
raise TypeError(
"Multiple values for keyword argument '" + name + "'")
values[name] = value
__auto_convert = values.pop("__auto_convert", True)
# 399: set default values only to fields loaded from DB
__only_fields = set(values.pop("__only_fields", values))
_created = values.pop("_created", True)
signals.pre_init.send(self.__class__, document=self, values=values)
# Check if there are undefined fields supplied to the constructor,
# if so raise an Exception.
if not self._dynamic and (self._meta.get('strict', True) or _created):
for var in values.keys():
if var not in self._fields.keys() + ['id', 'pk', '_cls', '_text_score']:
msg = (
"The field '{0}' does not exist on the document '{1}'"
).format(var, self._class_name)
raise FieldDoesNotExist(msg)
if self.STRICT and not self._dynamic:
self._data = StrictDict.create(allowed_keys=self._fields_ordered)()
else:
self._data = SemiStrictDict.create(
allowed_keys=self._fields_ordered)()
self._dynamic_fields = SON()
# Assign default values to instance
for key, field in self._fields.iteritems():
if self._db_field_map.get(key, key) in __only_fields:
continue
value = getattr(self, key, None)
setattr(self, key, value)
if "_cls" not in values:
self._cls = self._class_name
# Set passed values after initialisation
if self._dynamic:
dynamic_data = {}
for key, value in values.iteritems():
if key in self._fields or key == '_id':
setattr(self, key, value)
elif self._dynamic:
dynamic_data[key] = value
else:
FileField = _import_class('FileField')
for key, value in values.iteritems():
if key == '__auto_convert':
continue
key = self._reverse_db_field_map.get(key, key)
if key in self._fields or key in ('id', 'pk', '_cls'):
if __auto_convert and value is not None:
field = self._fields.get(key)
if field and not isinstance(field, FileField):
value = field.to_python(value)
setattr(self, key, value)
else:
self._data[key] = value
# Set any get_fieldname_display methods
self.__set_field_display()
if self._dynamic:
self._dynamic_lock = False
for key, value in dynamic_data.iteritems():
setattr(self, key, value)
# Flag initialised
self._initialised = True
self._created = _created
signals.post_init.send(self.__class__, document=self)
def __delattr__(self, *args, **kwargs):
"""Handle deletions of fields"""
field_name = args[0]
if field_name in self._fields:
default = self._fields[field_name].default
if callable(default):
default = default()
setattr(self, field_name, default)
else:
super(BaseDocument, self).__delattr__(*args, **kwargs)
def __setattr__(self, name, value):
# Handle dynamic data only if an initialised dynamic document
if self._dynamic and not self._dynamic_lock:
if not hasattr(self, name) and not name.startswith('_'):
DynamicField = _import_class("DynamicField")
field = DynamicField(db_field=name)
field.name = name
self._dynamic_fields[name] = field
self._fields_ordered += (name,)
if not name.startswith('_'):
value = self.__expand_dynamic_values(name, value)
# Handle marking data as changed
if name in self._dynamic_fields:
self._data[name] = value
if hasattr(self, '_changed_fields'):
self._mark_as_changed(name)
try:
self__created = self._created
except AttributeError:
self__created = True
if (self._is_document and not self__created and
name in self._meta.get('shard_key', tuple()) and
self._data.get(name) != value):
OperationError = _import_class('OperationError')
msg = "Shard Keys are immutable. Tried to update %s" % name
raise OperationError(msg)
try:
self__initialised = self._initialised
except AttributeError:
self__initialised = False
# Check if the user has created a new instance of a class
if (self._is_document and self__initialised and
self__created and name == self._meta.get('id_field')):
super(BaseDocument, self).__setattr__('_created', False)
super(BaseDocument, self).__setattr__(name, value)
def __getstate__(self):
data = {}
for k in ('_changed_fields', '_initialised', '_created',
'_dynamic_fields', '_fields_ordered'):
if hasattr(self, k):
data[k] = getattr(self, k)
data['_data'] = self.to_mongo()
return data
def __setstate__(self, data):
if isinstance(data["_data"], SON):
data["_data"] = self.__class__._from_son(data["_data"])._data
for k in ('_changed_fields', '_initialised', '_created', '_data',
'_dynamic_fields'):
if k in data:
setattr(self, k, data[k])
if '_fields_ordered' in data:
if self._dynamic:
setattr(self, '_fields_ordered', data['_fields_ordered'])
else:
_super_fields_ordered = type(self)._fields_ordered
setattr(self, '_fields_ordered', _super_fields_ordered)
dynamic_fields = data.get('_dynamic_fields') or SON()
for k in dynamic_fields.keys():
setattr(self, k, data["_data"].get(k))
def __iter__(self):
return iter(self._fields_ordered)
def __getitem__(self, name):
"""Dictionary-style field access, return a field's value if present.
"""
try:
if name in self._fields_ordered:
return getattr(self, name)
except AttributeError:
pass
raise KeyError(name)
def __setitem__(self, name, value):
"""Dictionary-style field access, set a field's value.
"""
# Ensure that the field exists before settings its value
if not self._dynamic and name not in self._fields:
raise KeyError(name)
return setattr(self, name, value)
def __contains__(self, name):
try:
val = getattr(self, name)
return val is not None
except AttributeError:
return False
def __len__(self):
return len(self._data)
def __repr__(self):
try:
u = self.__str__()
except (UnicodeEncodeError, UnicodeDecodeError):
u = '[Bad Unicode data]'
repr_type = str if u is None else type(u)
return repr_type('<%s: %s>' % (self.__class__.__name__, u))
def __str__(self):
if hasattr(self, '__unicode__'):
if PY3:
return self.__unicode__()
else:
return unicode(self).encode('utf-8')
return txt_type('%s object' % self.__class__.__name__)
def __eq__(self, other):
if isinstance(other, self.__class__) and hasattr(other, 'id') and other.id is not None:
return self.id == other.id
if isinstance(other, DBRef):
return self._get_collection_name() == other.collection and self.id == other.id
if self.id is None:
return self is other
return False
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
if getattr(self, 'pk', None) is None:
# For new object
return super(BaseDocument, self).__hash__()
else:
return hash(self.pk)
def clean(self):
"""
Hook for doing document level data cleaning before validation is run.
Any ValidationError raised by this method will not be associated with
a particular field; it will have a special-case association with the
field defined by NON_FIELD_ERRORS.
"""
pass
def get_text_score(self):
"""
Get text score from text query
"""
if '_text_score' not in self._data:
raise InvalidDocumentError('This document is not originally built from a text query')
return self._data['_text_score']
def to_mongo(self, use_db_field=True, fields=None):
"""
Return as SON data ready for use with MongoDB.
"""
if not fields:
fields = []
data = SON()
data["_id"] = None
data['_cls'] = self._class_name
EmbeddedDocumentField = _import_class("EmbeddedDocumentField")
# only root fields ['test1.a', 'test2'] => ['test1', 'test2']
root_fields = set([f.split('.')[0] for f in fields])
for field_name in self:
if root_fields and field_name not in root_fields:
continue
value = self._data.get(field_name, None)
field = self._fields.get(field_name)
if field is None and self._dynamic:
field = self._dynamic_fields.get(field_name)
if value is not None:
if isinstance(field, EmbeddedDocumentField):
if fields:
key = '%s.' % field_name
embedded_fields = [
i.replace(key, '') for i in fields
if i.startswith(key)]
else:
embedded_fields = []
value = field.to_mongo(value, use_db_field=use_db_field,
fields=embedded_fields)
else:
value = field.to_mongo(value)
# Handle self generating fields
if value is None and field._auto_gen:
value = field.generate()
self._data[field_name] = value
if value is not None:
if use_db_field:
data[field.db_field] = value
else:
data[field.name] = value
# If "_id" has not been set, then try and set it
Document = _import_class("Document")
if isinstance(self, Document):
if data["_id"] is None:
data["_id"] = self._data.get("id", None)
if data['_id'] is None:
data.pop('_id')
# Only add _cls if allow_inheritance is True
if (not hasattr(self, '_meta') or
not self._meta.get('allow_inheritance', ALLOW_INHERITANCE)):
data.pop('_cls')
return data
def validate(self, clean=True):
"""Ensure that all fields' values are valid and that required fields
are present.
"""
# Ensure that each field is matched to a valid value
errors = {}
if clean:
try:
self.clean()
except ValidationError, error:
errors[NON_FIELD_ERRORS] = error
# Get a list of tuples of field names and their current values
fields = [(self._fields.get(name, self._dynamic_fields.get(name)),
self._data.get(name)) for name in self._fields_ordered]
EmbeddedDocumentField = _import_class("EmbeddedDocumentField")
GenericEmbeddedDocumentField = _import_class(
"GenericEmbeddedDocumentField")
for field, value in fields:
if value is not None:
try:
if isinstance(field, (EmbeddedDocumentField,
GenericEmbeddedDocumentField)):
field._validate(value, clean=clean)
else:
field._validate(value)
except ValidationError, error:
errors[field.name] = error.errors or error
except (ValueError, AttributeError, AssertionError), error:
errors[field.name] = error
elif field.required and not getattr(field, '_auto_gen', False):
errors[field.name] = ValidationError('Field is required',
field_name=field.name)
if errors:
pk = "None"
if hasattr(self, 'pk'):
pk = self.pk
elif self._instance and hasattr(self._instance, 'pk'):
pk = self._instance.pk
message = "ValidationError (%s:%s) " % (self._class_name, pk)
raise ValidationError(message, errors=errors)
def to_json(self, *args, **kwargs):
"""Converts a document to JSON.
:param use_db_field: Set to True by default but enables the output of the json structure with the field names
and not the mongodb store db_names in case of set to False
"""
use_db_field = kwargs.pop('use_db_field', True)
return json_util.dumps(self.to_mongo(use_db_field), *args, **kwargs)
@classmethod
def from_json(cls, json_data, created=False):
"""Converts json data to an unsaved document instance"""
return cls._from_son(json_util.loads(json_data), created=created)
def __expand_dynamic_values(self, name, value):
"""expand any dynamic values to their correct types / values"""
if not isinstance(value, (dict, list, tuple)):
return value
EmbeddedDocumentListField = _import_class('EmbeddedDocumentListField')
is_list = False
if not hasattr(value, 'items'):
is_list = True
value = dict([(k, v) for k, v in enumerate(value)])
if not is_list and '_cls' in value:
cls = get_document(value['_cls'])
return cls(**value)
data = {}
for k, v in value.items():
key = name if is_list else k
data[k] = self.__expand_dynamic_values(key, v)
if is_list: # Convert back to a list
data_items = sorted(data.items(), key=operator.itemgetter(0))
value = [v for k, v in data_items]
else:
value = data
# Convert lists / values so we can watch for any changes on them
if (isinstance(value, (list, tuple)) and
not isinstance(value, BaseList)):
if issubclass(type(self), EmbeddedDocumentListField):
value = EmbeddedDocumentList(value, self, name)
else:
value = BaseList(value, self, name)
elif isinstance(value, dict) and not isinstance(value, BaseDict):
value = BaseDict(value, self, name)
return value
def _mark_as_changed(self, key):
"""Marks a key as explicitly changed by the user
"""
if not key:
return
if not hasattr(self, '_changed_fields'):
return
if '.' in key:
key, rest = key.split('.', 1)
key = self._db_field_map.get(key, key)
key = '%s.%s' % (key, rest)
else:
key = self._db_field_map.get(key, key)
if key not in self._changed_fields:
levels, idx = key.split('.'), 1
while idx <= len(levels):
if '.'.join(levels[:idx]) in self._changed_fields:
break
idx += 1
else:
self._changed_fields.append(key)
# remove lower level changed fields
level = '.'.join(levels[:idx]) + '.'
remove = self._changed_fields.remove
for field in self._changed_fields:
if field.startswith(level):
remove(field)
def _clear_changed_fields(self):
"""Using get_changed_fields iterate and remove any fields that are
marked as changed"""
for changed in self._get_changed_fields():
parts = changed.split(".")
data = self
for part in parts:
if isinstance(data, list):
try:
data = data[int(part)]
except IndexError:
data = None
elif isinstance(data, dict):
data = data.get(part, None)
else:
data = getattr(data, part, None)
if hasattr(data, "_changed_fields"):
if hasattr(data, "_is_document") and data._is_document:
continue
data._changed_fields = []
self._changed_fields = []
def _nestable_types_changed_fields(self, changed_fields, key, data, inspected):
# Loop list / dict fields as they contain documents
# Determine the iterator to use
if not hasattr(data, 'items'):
iterator = enumerate(data)
else:
iterator = data.iteritems()
for index, value in iterator:
list_key = "%s%s." % (key, index)
# don't check anything lower if this key is already marked
# as changed.
if list_key[:-1] in changed_fields:
continue
if hasattr(value, '_get_changed_fields'):
changed = value._get_changed_fields(inspected)
changed_fields += ["%s%s" % (list_key, k)
for k in changed if k]
elif isinstance(value, (list, tuple, dict)):
self._nestable_types_changed_fields(
changed_fields, list_key, value, inspected)
def _get_changed_fields(self, inspected=None):
"""Returns a list of all fields that have explicitly been changed.
"""
EmbeddedDocument = _import_class("EmbeddedDocument")
DynamicEmbeddedDocument = _import_class("DynamicEmbeddedDocument")
ReferenceField = _import_class("ReferenceField")
SortedListField = _import_class("SortedListField")
changed_fields = []
changed_fields += getattr(self, '_changed_fields', [])
inspected = inspected or set()
if hasattr(self, 'id') and isinstance(self.id, Hashable):
if self.id in inspected:
return changed_fields
inspected.add(self.id)
for field_name in self._fields_ordered:
db_field_name = self._db_field_map.get(field_name, field_name)
key = '%s.' % db_field_name
data = self._data.get(field_name, None)
field = self._fields.get(field_name)
if hasattr(data, 'id'):
if data.id in inspected:
continue
if isinstance(field, ReferenceField):
continue
elif (isinstance(data, (EmbeddedDocument, DynamicEmbeddedDocument))
and db_field_name not in changed_fields):
# Find all embedded fields that have been changed
changed = data._get_changed_fields(inspected)
changed_fields += ["%s%s" % (key, k) for k in changed if k]
elif (isinstance(data, (list, tuple, dict)) and
db_field_name not in changed_fields):
if (hasattr(field, 'field') and
isinstance(field.field, ReferenceField)):
continue
elif isinstance(field, SortedListField) and field._ordering:
# if ordering is affected whole list is changed
if any(map(lambda d: field._ordering in d._changed_fields, data)):
changed_fields.append(db_field_name)
continue
self._nestable_types_changed_fields(
changed_fields, key, data, inspected)
return changed_fields
def _delta(self):
"""Returns the delta (set, unset) of the changes for a document.
Gets any values that have been explicitly changed.
"""
# Handles cases where not loaded from_son but has _id
doc = self.to_mongo()
set_fields = self._get_changed_fields()
unset_data = {}
parts = []
if hasattr(self, '_changed_fields'):
set_data = {}
# Fetch each set item from its path
for path in set_fields:
parts = path.split('.')
d = doc
new_path = []
for p in parts:
if isinstance(d, (ObjectId, DBRef)):
break
elif isinstance(d, list) and p.isdigit():
try:
d = d[int(p)]
except IndexError:
d = None
elif hasattr(d, 'get'):
d = d.get(p)
new_path.append(p)
path = '.'.join(new_path)
set_data[path] = d
else:
set_data = doc
if '_id' in set_data:
del set_data['_id']
# Determine if any changed items were actually unset.
for path, value in set_data.items():
if value or isinstance(value, (numbers.Number, bool)):
continue
# If we've set a value that ain't the default value don't unset it.
default = None
if (self._dynamic and len(parts) and parts[0] in
self._dynamic_fields):
del set_data[path]
unset_data[path] = 1
continue
elif path in self._fields:
default = self._fields[path].default
else: # Perform a full lookup for lists / embedded lookups
d = self
parts = path.split('.')
db_field_name = parts.pop()
for p in parts:
if isinstance(d, list) and p.isdigit():
d = d[int(p)]
elif (hasattr(d, '__getattribute__') and
not isinstance(d, dict)):
real_path = d._reverse_db_field_map.get(p, p)
d = getattr(d, real_path)
else:
d = d.get(p)
if hasattr(d, '_fields'):
field_name = d._reverse_db_field_map.get(db_field_name,
db_field_name)
if field_name in d._fields:
default = d._fields.get(field_name).default
else:
default = None
if default is not None:
if callable(default):
default = default()
if default != value:
continue
del set_data[path]
unset_data[path] = 1
return set_data, unset_data
@classmethod
def _get_collection_name(cls):
"""Returns the collection name for this class. None for abstract class
"""
return cls._meta.get('collection', None)
@classmethod
def _from_son(cls, son, _auto_dereference=True, only_fields=None, created=False):
"""Create an instance of a Document (subclass) from a PyMongo SON.
"""
if not only_fields:
only_fields = []
# get the class name from the document, falling back to the given
# class if unavailable
class_name = son.get('_cls', cls._class_name)
data = dict(("%s" % key, value) for key, value in son.iteritems())
# Return correct subclass for document type
if class_name != cls._class_name:
cls = get_document(class_name)
changed_fields = []
errors_dict = {}
fields = cls._fields
if not _auto_dereference:
fields = copy.copy(fields)
for field_name, field in fields.iteritems():
field._auto_dereference = _auto_dereference
if field.db_field in data:
value = data[field.db_field]
try:
data[field_name] = (value if value is None
else field.to_python(value))
if field_name != field.db_field:
del data[field.db_field]
except (AttributeError, ValueError), e:
errors_dict[field_name] = e
elif field.default:
default = field.default
if callable(default):
default = default()
if isinstance(default, BaseDocument):
changed_fields.append(field_name)
elif not only_fields or field_name in only_fields:
changed_fields.append(field_name)
if errors_dict:
errors = "\n".join(["%s - %s" % (k, v)
for k, v in errors_dict.items()])
msg = ("Invalid data to create a `%s` instance.\n%s"
% (cls._class_name, errors))
raise InvalidDocumentError(msg)
if cls.STRICT:
data = dict((k, v)
for k, v in data.iteritems() if k in cls._fields)
obj = cls(__auto_convert=False, _created=created, __only_fields=only_fields, **data)
obj._changed_fields = changed_fields
if not _auto_dereference:
obj._fields = fields
return obj
@classmethod
def _build_index_specs(cls, meta_indexes):
"""Generate and merge the full index specs
"""
geo_indices = cls._geo_indices()
unique_indices = cls._unique_with_indexes()
index_specs = [cls._build_index_spec(spec)
for spec in meta_indexes]
def merge_index_specs(index_specs, indices):
if not indices:
return index_specs
spec_fields = [v['fields']
for k, v in enumerate(index_specs)]
# Merge unique_indexes with existing specs
for k, v in enumerate(indices):
if v['fields'] in spec_fields:
index_specs[spec_fields.index(v['fields'])].update(v)
else:
index_specs.append(v)
return index_specs
index_specs = merge_index_specs(index_specs, geo_indices)
index_specs = merge_index_specs(index_specs, unique_indices)
return index_specs
@classmethod
def _build_index_spec(cls, spec):
"""Build a PyMongo index spec from a MongoEngine index spec.
"""
if isinstance(spec, basestring):
spec = {'fields': [spec]}
elif isinstance(spec, (list, tuple)):
spec = {'fields': list(spec)}
elif isinstance(spec, dict):
spec = dict(spec)
index_list = []
direction = None
# Check to see if we need to include _cls
allow_inheritance = cls._meta.get('allow_inheritance',
ALLOW_INHERITANCE)
include_cls = (allow_inheritance and not spec.get('sparse', False) and
spec.get('cls', True) and '_cls' not in spec['fields'])
# 733: don't include cls if index_cls is False unless there is an explicit cls with the index
include_cls = include_cls and (spec.get('cls', False) or cls._meta.get('index_cls', True))
if "cls" in spec:
spec.pop('cls')
for key in spec['fields']:
# If inherited spec continue
if isinstance(key, (list, tuple)):
continue
# ASCENDING from +
# DESCENDING from -
# TEXT from $
# HASHED from #
# GEOSPHERE from (
# GEOHAYSTACK from )
# GEO2D from *
direction = pymongo.ASCENDING
if key.startswith("-"):
direction = pymongo.DESCENDING
elif key.startswith("$"):
direction = pymongo.TEXT
elif key.startswith("#"):
direction = pymongo.HASHED
elif key.startswith("("):
direction = pymongo.GEOSPHERE
elif key.startswith(")"):
direction = pymongo.GEOHAYSTACK
elif key.startswith("*"):
direction = pymongo.GEO2D
if key.startswith(("+", "-", "*", "$", "#", "(", ")")):
key = key[1:]
# Use real field name, do it manually because we need field
# objects for the next part (list field checking)
parts = key.split('.')
if parts in (['pk'], ['id'], ['_id']):
key = '_id'
else:
fields = cls._lookup_field(parts)
parts = []
for field in fields:
try:
if field != "_id":
field = field.db_field
except AttributeError:
pass
parts.append(field)
key = '.'.join(parts)
index_list.append((key, direction))
# Don't add cls to a geo index
if include_cls and direction not in (
pymongo.GEO2D, pymongo.GEOHAYSTACK, pymongo.GEOSPHERE):
index_list.insert(0, ('_cls', 1))
if index_list:
spec['fields'] = index_list
return spec
@classmethod
def _unique_with_indexes(cls, namespace=""):
"""
Find and set unique indexes
"""
unique_indexes = []
for field_name, field in cls._fields.items():
sparse = field.sparse
# Generate a list of indexes needed by uniqueness constraints
if field.unique:
unique_fields = [field.db_field]
# Add any unique_with fields to the back of the index spec
if field.unique_with:
if isinstance(field.unique_with, basestring):
field.unique_with = [field.unique_with]
# Convert unique_with field names to real field names
unique_with = []
for other_name in field.unique_with:
parts = other_name.split('.')
# Lookup real name
parts = cls._lookup_field(parts)
name_parts = [part.db_field for part in parts]
unique_with.append('.'.join(name_parts))
# Unique field should be required
parts[-1].required = True
sparse = (not sparse and
parts[-1].name not in cls.__dict__)
unique_fields += unique_with
# Add the new index to the list
fields = [("%s%s" % (namespace, f), pymongo.ASCENDING)
for f in unique_fields]
index = {'fields': fields, 'unique': True, 'sparse': sparse}
unique_indexes.append(index)
if field.__class__.__name__ == "ListField":
field = field.field
# Grab any embedded document field unique indexes
if (field.__class__.__name__ == "EmbeddedDocumentField" and
field.document_type != cls):
field_namespace = "%s." % field_name
doc_cls = field.document_type
unique_indexes += doc_cls._unique_with_indexes(field_namespace)
return unique_indexes
@classmethod
def _geo_indices(cls, inspected=None, parent_field=None):
inspected = inspected or []
geo_indices = []
inspected.append(cls)
geo_field_type_names = ["EmbeddedDocumentField", "GeoPointField",
"PointField", "LineStringField", "PolygonField"]
geo_field_types = tuple([_import_class(field)
for field in geo_field_type_names])
for field in cls._fields.values():
if not isinstance(field, geo_field_types):
continue
if hasattr(field, 'document_type'):
field_cls = field.document_type
if field_cls in inspected:
continue
if hasattr(field_cls, '_geo_indices'):
geo_indices += field_cls._geo_indices(
inspected, parent_field=field.db_field)
elif field._geo_index:
field_name = field.db_field
if parent_field:
field_name = "%s.%s" % (parent_field, field_name)
geo_indices.append({'fields':
[(field_name, field._geo_index)]})
return geo_indices
@classmethod
def _lookup_field(cls, parts):
"""Lookup a field based on its attribute and return a list containing
the field's parents and the field.
"""
ListField = _import_class("ListField")
DynamicField = _import_class('DynamicField')
if not isinstance(parts, (list, tuple)):
parts = [parts]
fields = []
field = None
for field_name in parts:
# Handle ListField indexing:
if field_name.isdigit() and isinstance(field, ListField):
fields.append(field_name)
continue
if field is None:
# Look up first field from the document
if field_name == 'pk':
# Deal with "primary key" alias
field_name = cls._meta['id_field']
if field_name in cls._fields:
field = cls._fields[field_name]
elif cls._dynamic:
field = DynamicField(db_field=field_name)
elif cls._meta.get("allow_inheritance", False) or cls._meta.get("abstract", False):
# 744: in case the field is defined in a subclass
for subcls in cls.__subclasses__():
try:
field = subcls._lookup_field([field_name])[0]
except LookUpError:
continue
if field is not None:
break
else:
raise LookUpError('Cannot resolve field "%s"' % field_name)
else:
raise LookUpError('Cannot resolve field "%s"'
% field_name)
else:
ReferenceField = _import_class('ReferenceField')
GenericReferenceField = _import_class('GenericReferenceField')
if isinstance(field, (ReferenceField, GenericReferenceField)):
raise LookUpError('Cannot perform join in mongoDB: %s' %
'__'.join(parts))
if hasattr(getattr(field, 'field', None), 'lookup_member'):
new_field = field.field.lookup_member(field_name)
elif cls._dynamic and (isinstance(field, DynamicField) or
getattr(getattr(field, 'document_type'), '_dynamic')):
new_field = DynamicField(db_field=field_name)
else:
# Look up subfield on the previous field or raise
try:
new_field = field.lookup_member(field_name)
except AttributeError:
raise LookUpError('Cannot resolve subfield or operator {} '
'on the field {}'.format(
field_name, field.name))
if not new_field and isinstance(field, ComplexBaseField):
fields.append(field_name)
continue
elif not new_field:
raise LookUpError('Cannot resolve field "%s"'
% field_name)
field = new_field # update field to the new field type
fields.append(field)
return fields
@classmethod
def _translate_field_name(cls, field, sep='.'):
"""Translate a field attribute name to a database field name.
"""