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