-
Notifications
You must be signed in to change notification settings - Fork 755
/
filterset.py
538 lines (452 loc) · 17.6 KB
/
filterset.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
from __future__ import absolute_import
from __future__ import unicode_literals
import copy
import re
from collections import OrderedDict
from django import forms
from django.forms.forms import NON_FIELD_ERRORS
from django.core.validators import EMPTY_VALUES
from django.db import models
from django.db.models.constants import LOOKUP_SEP
from django.db.models.fields.related import ForeignObjectRel
from django.utils import six
from django.utils.text import capfirst
from django.utils.translation import ugettext as _
from .compat import remote_field, remote_model, remote_queryset
from .filters import (Filter, CharFilter, BooleanFilter, BaseInFilter, BaseRangeFilter,
ChoiceFilter, DateFilter, DateTimeFilter, TimeFilter, ModelChoiceFilter,
ModelMultipleChoiceFilter, NumberFilter, UUIDFilter,
DurationFilter)
from .utils import try_dbfield, get_model_field, resolve_field
ORDER_BY_FIELD = 'o'
class STRICTNESS(object):
"""
Values of False & True chosen for backward compatability reasons.
Originally, these were the only options.
"""
IGNORE = False
RETURN_NO_RESULTS = True
RAISE_VALIDATION_ERROR = "RAISE"
def get_declared_filters(bases, attrs, with_base_filters=True):
filters = []
for filter_name, obj in list(attrs.items()):
if isinstance(obj, Filter):
obj = attrs.pop(filter_name)
if getattr(obj, 'name', None) is None:
obj.name = filter_name
filters.append((filter_name, obj))
filters.sort(key=lambda x: x[1].creation_counter)
if with_base_filters:
for base in bases[::-1]:
if hasattr(base, 'base_filters'):
filters = list(base.base_filters.items()) + filters
else:
for base in bases[::-1]:
if hasattr(base, 'declared_filters'):
filters = list(base.declared_filters.items()) + filters
return OrderedDict(filters)
def filters_for_model(model, fields=None, exclude=None, filter_for_field=None,
filter_for_reverse_field=None):
field_dict = OrderedDict()
opts = model._meta
if fields is None:
fields = [
f.name for f in sorted(opts.fields + opts.many_to_many)
if not isinstance(f, models.AutoField) and
not (getattr(remote_field(f), 'parent_link', False))
]
# Loop through the list of fields.
for f in fields:
# Skip the field if excluded.
if exclude is not None and f in exclude:
continue
field = get_model_field(model, f)
# Do nothing if the field doesn't exist.
if field is None:
field_dict[f] = None
continue
if isinstance(field, ForeignObjectRel):
filter_ = filter_for_reverse_field(field, f)
if filter_:
field_dict[f] = filter_
# If fields is a dictionary, it must contain lists.
elif isinstance(fields, dict):
# Create a filter for each lookup type.
for lookup_expr in fields[f]:
filter_ = filter_for_field(field, f, lookup_expr)
if filter_:
filter_name = LOOKUP_SEP.join([f, lookup_expr])
# Don't add "exact" to filter names
_exact = LOOKUP_SEP + 'exact'
if filter_name.endswith(_exact):
filter_name = filter_name[:-len(_exact)]
field_dict[filter_name] = filter_
# If fields is a list, it contains strings.
else:
filter_ = filter_for_field(field, f)
if filter_:
field_dict[f] = filter_
return field_dict
def get_full_clean_override(together):
def full_clean(form):
def add_error(message):
try:
form.add_error(None, message)
except AttributeError:
form._errors[NON_FIELD_ERRORS] = message
def all_valid(fieldset):
cleaned_data = form.cleaned_data
count = len([i for i in fieldset if cleaned_data.get(i)])
return 0 < count < len(fieldset)
super(form.__class__, form).full_clean()
message = 'Following fields must be together: %s'
if isinstance(together[0], (list, tuple)):
for each in together:
if all_valid(each):
return add_error(message % ','.join(each))
elif all_valid(together):
return add_error(message % ','.join(together))
return full_clean
class FilterSetOptions(object):
def __init__(self, options=None):
self.model = getattr(options, 'model', None)
self.fields = getattr(options, 'fields', None)
self.exclude = getattr(options, 'exclude', None)
self.order_by = getattr(options, 'order_by', False)
self.form = getattr(options, 'form', forms.Form)
self.together = getattr(options, 'together', None)
class FilterSetMetaclass(type):
def __new__(cls, name, bases, attrs):
try:
parents = [b for b in bases if issubclass(b, FilterSet)]
except NameError:
# We are defining FilterSet itself here
parents = None
declared_filters = get_declared_filters(bases, attrs, False)
new_class = super(
FilterSetMetaclass, cls).__new__(cls, name, bases, attrs)
if not parents:
return new_class
opts = new_class._meta = FilterSetOptions(
getattr(new_class, 'Meta', None))
if opts.model:
filters = new_class.filters_for_model(opts.model, opts)
filters.update(declared_filters)
else:
filters = declared_filters
not_defined = next((k for k, v in filters.items() if v is None), False)
if not_defined:
raise TypeError("Meta.fields contains a field that isn't defined "
"on this FilterSet: {}".format(not_defined))
new_class.declared_filters = declared_filters
new_class.base_filters = filters
return new_class
FILTER_FOR_DBFIELD_DEFAULTS = {
models.AutoField: {
'filter_class': NumberFilter
},
models.CharField: {
'filter_class': CharFilter
},
models.TextField: {
'filter_class': CharFilter
},
models.BooleanField: {
'filter_class': BooleanFilter
},
models.DateField: {
'filter_class': DateFilter
},
models.DateTimeField: {
'filter_class': DateTimeFilter
},
models.TimeField: {
'filter_class': TimeFilter
},
models.DurationField: {
'filter_class': DurationFilter
},
models.OneToOneField: {
'filter_class': ModelChoiceFilter,
'extra': lambda f: {
'queryset': remote_queryset(f),
'to_field_name': remote_field(f).field_name,
}
},
models.ForeignKey: {
'filter_class': ModelChoiceFilter,
'extra': lambda f: {
'queryset': remote_queryset(f),
'to_field_name': remote_field(f).field_name,
}
},
models.ManyToManyField: {
'filter_class': ModelMultipleChoiceFilter,
'extra': lambda f: {
'queryset': remote_queryset(f),
}
},
models.DecimalField: {
'filter_class': NumberFilter,
},
models.SmallIntegerField: {
'filter_class': NumberFilter,
},
models.IntegerField: {
'filter_class': NumberFilter,
},
models.PositiveIntegerField: {
'filter_class': NumberFilter,
},
models.PositiveSmallIntegerField: {
'filter_class': NumberFilter,
},
models.FloatField: {
'filter_class': NumberFilter,
},
models.NullBooleanField: {
'filter_class': BooleanFilter,
},
models.SlugField: {
'filter_class': CharFilter,
},
models.EmailField: {
'filter_class': CharFilter,
},
models.FilePathField: {
'filter_class': CharFilter,
},
models.URLField: {
'filter_class': CharFilter,
},
models.GenericIPAddressField: {
'filter_class': CharFilter,
},
models.CommaSeparatedIntegerField: {
'filter_class': CharFilter,
},
models.UUIDField: {
'filter_class': UUIDFilter,
},
}
class BaseFilterSet(object):
filter_overrides = {}
order_by_field = ORDER_BY_FIELD
# What to do on on validation errors
strict = STRICTNESS.RETURN_NO_RESULTS
def __init__(self, data=None, queryset=None, prefix=None, strict=None):
self.is_bound = data is not None
self.data = data or {}
if queryset is None:
queryset = self._meta.model._default_manager.all()
self.queryset = queryset
self.form_prefix = prefix
if strict is not None:
self.strict = strict
self.filters = copy.deepcopy(self.base_filters)
# propagate the model being used through the filters
for filter_ in self.filters.values():
filter_.model = self._meta.model
# Apply the parent to the filters, this will allow the filters to access the filterset
for filter_key, filter_ in six.iteritems(self.filters):
filter_.parent = self
def __iter__(self):
for obj in self.qs:
yield obj
def __len__(self):
return self.qs.count()
def __getitem__(self, key):
return self.qs[key]
@property
def qs(self):
if not hasattr(self, '_qs'):
valid = self.is_bound and self.form.is_valid()
if self.is_bound and not valid:
if self.strict == STRICTNESS.RAISE_VALIDATION_ERROR:
raise forms.ValidationError(self.form.errors)
elif bool(self.strict) == STRICTNESS.RETURN_NO_RESULTS:
self._qs = self.queryset.none()
return self._qs
# else STRICTNESS.IGNORE... ignoring
# start with all the results and filter from there
qs = self.queryset.all()
for name, filter_ in six.iteritems(self.filters):
value = None
if valid:
value = self.form.cleaned_data[name]
else:
raw_value = self.form[name].value()
try:
value = self.form.fields[name].clean(raw_value)
except forms.ValidationError:
if self.strict == STRICTNESS.RAISE_VALIDATION_ERROR:
raise
elif bool(self.strict) == STRICTNESS.RETURN_NO_RESULTS:
self._qs = self.queryset.none()
return self._qs
# else STRICTNESS.IGNORE... ignoring
if value is not None: # valid & clean data
qs = filter_.filter(qs, value)
if self._meta.order_by:
order_field = self.form.fields[self.order_by_field]
data = self.form[self.order_by_field].data
ordered_value = None
try:
ordered_value = order_field.clean(data)
except forms.ValidationError:
pass
# With a None-queryset, ordering must be enforced (#84).
if (ordered_value in EMPTY_VALUES and
self.strict == STRICTNESS.RETURN_NO_RESULTS):
ordered_value = self.form.fields[self.order_by_field].choices[0][0]
if ordered_value:
qs = qs.order_by(*self.get_order_by(ordered_value))
self._qs = qs
return self._qs
def count(self):
return self.qs.count()
@property
def form(self):
if not hasattr(self, '_form'):
fields = OrderedDict([
(name, filter_.field)
for name, filter_ in six.iteritems(self.filters)])
fields[self.order_by_field] = self.ordering_field
Form = type(str('%sForm' % self.__class__.__name__),
(self._meta.form,), fields)
if self._meta.together:
Form.full_clean = get_full_clean_override(self._meta.together)
if self.is_bound:
self._form = Form(self.data, prefix=self.form_prefix)
else:
self._form = Form(prefix=self.form_prefix)
return self._form
def get_ordering_field(self):
if self._meta.order_by:
if isinstance(self._meta.order_by, (list, tuple)):
if isinstance(self._meta.order_by[0], (list, tuple)):
# e.g. (('field', 'Display name'), ...)
choices = [(f[0], f[1]) for f in self._meta.order_by]
else:
choices = []
for f in self._meta.order_by:
if f[0] == '-':
label = _('%s (descending)' % capfirst(f[1:]))
else:
label = capfirst(f)
choices.append((f, label))
else:
# add asc and desc field names
# use the filter's label if provided
choices = []
for f, fltr in self.filters.items():
choices.extend([
(f, fltr.label or capfirst(f)),
("-%s" % (f), _('%s (descending)' % (fltr.label or capfirst(f))))
])
return forms.ChoiceField(label=_("Ordering"), required=False,
choices=choices)
@property
def ordering_field(self):
if not hasattr(self, '_ordering_field'):
self._ordering_field = self.get_ordering_field()
return self._ordering_field
def get_order_by(self, order_choice):
re_ordering_field = re.compile(r'(?P<inverse>\-?)(?P<field>.*)')
m = re.match(re_ordering_field, order_choice)
inverted = m.group('inverse')
filter_api_name = m.group('field')
_filter = self.filters.get(filter_api_name, None)
if _filter and filter_api_name != _filter.name:
return [inverted + _filter.name]
return [order_choice]
@classmethod
def filters_for_model(cls, model, opts):
return filters_for_model(
model, opts.fields, opts.exclude,
cls.filter_for_field,
cls.filter_for_reverse_field
)
@classmethod
def filter_for_field(cls, f, name, lookup_expr='exact'):
f, lookup_type = resolve_field(f, lookup_expr)
default = {
'name': name,
'label': capfirst(f.verbose_name),
'lookup_expr': lookup_expr
}
filter_class, params = cls.filter_for_lookup(f, lookup_type)
default.update(params)
if filter_class is not None:
return filter_class(**default)
@classmethod
def filter_for_reverse_field(cls, f, name):
rel = remote_field(f.field)
queryset = f.field.model._default_manager.all()
default = {
'name': name,
'label': capfirst(rel.related_name),
'queryset': queryset,
}
if rel.multiple:
return ModelMultipleChoiceFilter(**default)
else:
return ModelChoiceFilter(**default)
@classmethod
def filter_for_lookup(cls, f, lookup_type):
DEFAULTS = dict(FILTER_FOR_DBFIELD_DEFAULTS)
DEFAULTS.update(cls.filter_overrides)
data = try_dbfield(DEFAULTS.get, f.__class__) or {}
filter_class = data.get('filter_class')
params = data.get('extra', lambda f: {})(f)
# if there is no filter class, exit early
if not filter_class:
return None, {}
# perform lookup specific checks
if lookup_type == 'exact' and f.choices:
return ChoiceFilter, {'choices': f.choices}
if lookup_type == 'isnull':
data = try_dbfield(DEFAULTS.get, models.BooleanField)
filter_class = data.get('filter_class')
params = data.get('extra', lambda f: {})(f)
return filter_class, params
if lookup_type == 'in':
class ConcreteInFilter(BaseInFilter, filter_class):
pass
ConcreteInFilter.__name__ = cls._csv_filter_class_name(
filter_class, lookup_type
)
return ConcreteInFilter, params
if lookup_type == 'range':
class ConcreteRangeFilter(BaseRangeFilter, filter_class):
pass
ConcreteRangeFilter.__name__ = cls._csv_filter_class_name(
filter_class, lookup_type
)
return ConcreteRangeFilter, params
return filter_class, params
@classmethod
def _csv_filter_class_name(cls, filter_class, lookup_type):
"""
Generate a suitable class name for a concrete filter class. This is not
completely reliable, as not all filter class names are of the format
<Type>Filter.
ex::
FilterSet._csv_filter_class_name(DateTimeFilter, 'in')
returns 'DateTimeInFilter'
"""
# DateTimeFilter => DateTime
type_name = filter_class.__name__
if type_name.endswith('Filter'):
type_name = type_name[:-6]
# in => In
lookup_name = lookup_type.capitalize()
# DateTimeInFilter
return str('%s%sFilter' % (type_name, lookup_name))
class FilterSet(six.with_metaclass(FilterSetMetaclass, BaseFilterSet)):
pass
def filterset_factory(model):
meta = type(str('Meta'), (object,), {'model': model})
filterset = type(str('%sFilterSet' % model._meta.object_name),
(FilterSet,), {'Meta': meta})
return filterset