116 lines
3.6 KiB
Python
116 lines
3.6 KiB
Python
# zoo - versatile objects management
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# Copyright (C) 2016 Entr'ouvert
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import django
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from django.db.models import Transform, TextField, DateField
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from django.contrib.postgres.fields import jsonb
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try:
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from django.contrib.postgres.fields.jsonb import KeyTransform, KeyTransformTextLookupMixin
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except ImportError:
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# backport from Django 2.x
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class KeyTransform(Transform):
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operator = '->'
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nested_operator = '#>'
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def __init__(self, key_name, *args, **kwargs):
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super(KeyTransform, self).__init__(*args, **kwargs)
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self.key_name = key_name
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def as_sql(self, compiler, connection):
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key_transforms = [self.key_name]
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previous = self.lhs
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while isinstance(previous, KeyTransform):
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key_transforms.insert(0, previous.key_name)
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previous = previous.lhs
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lhs, params = compiler.compile(previous)
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if len(key_transforms) > 1:
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return "(%s %s %%s)" % (lhs, self.nested_operator), [key_transforms] + params
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try:
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int(self.key_name)
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except ValueError:
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lookup = "'%s'" % self.key_name
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else:
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lookup = "%s" % self.key_name
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return "(%s %s %s)" % (lhs, self.operator, lookup), params
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jsonb.KeyTransform = KeyTransform
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class KeyTextTransform(KeyTransform):
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operator = '->>'
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nested_operator = '#>>'
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_output_field = TextField()
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class KeyTransformTextLookupMixin(object):
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"""
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Mixin for combining with a lookup expecting a text lhs from a JSONField
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key lookup. Make use of the ->> operator instead of casting key values to
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text and performing the lookup on the resulting representation.
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"""
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def __init__(self, key_transform, *args, **kwargs):
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assert isinstance(key_transform, KeyTransform)
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key_text_transform = KeyTextTransform(
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key_transform.key_name, *key_transform.source_expressions, **key_transform.extra
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)
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super(KeyTransformTextLookupMixin, self).__init__(key_text_transform, *args, **kwargs)
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class Lower(Transform):
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lookup_name = 'lower'
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function = 'LOWER'
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TextField.register_lookup(Lower)
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class Unaccent(Transform):
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lookup_name = 'unaccent'
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function = 'immutable_unaccent'
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TextField.register_lookup(Unaccent)
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class Normalize(Transform):
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lookup_name = 'normalize'
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function = 'immutable_normalize'
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TextField.register_lookup(Normalize)
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class Date(Transform):
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lookup_name = 'timestamp'
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function = 'immutable_date'
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_output_field = DateField()
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TextField.register_lookup(Date)
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class JSONUnaccent(KeyTransformTextLookupMixin, Unaccent):
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pass
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class JSONTimestamp(KeyTransformTextLookupMixin, Date):
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pass
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class JSONNormalize(KeyTransformTextLookupMixin, Normalize):
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pass
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KeyTransform.register_lookup(JSONUnaccent)
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KeyTransform.register_lookup(JSONTimestamp)
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KeyTransform.register_lookup(JSONNormalize)
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