django-localized-fields/localized_fields/lookups.py

from django.conf import settings
from django.contrib.postgres.fields.hstore import KeyTransform
from django.contrib.postgres.lookups import (SearchLookup, TrigramSimilar,
                                             Unaccent)
from django.db.models.expressions import Col
from django.db.models.lookups import (Contains, EndsWith, Exact, IContains,
                                      IEndsWith, IExact, In, IRegex, IsNull,
                                      IStartsWith, Regex, StartsWith)
from django.utils import translation


class LocalizedLookupMixin():
    def process_lhs(self, qn, connection):
        if isinstance(self.lhs, Col):
            language = translation.get_language() or settings.LANGUAGE_CODE
            self.lhs = KeyTransform(language, self.lhs)
        return super().process_lhs(qn, connection)

    def get_prep_lookup(self):
        return str(self.rhs)


class LocalizedSearchLookup(LocalizedLookupMixin, SearchLookup):
    pass


class LocalizedUnaccent(LocalizedLookupMixin, Unaccent):
    pass


class LocalizedTrigramSimilair(LocalizedLookupMixin, TrigramSimilar):
    pass


class LocalizedExact(LocalizedLookupMixin, Exact):
    pass


class LocalizedIExact(LocalizedLookupMixin, IExact):
    pass


class LocalizedIn(LocalizedLookupMixin, In):
    pass


class LocalizedContains(LocalizedLookupMixin, Contains):
    pass


class LocalizedIContains(LocalizedLookupMixin, IContains):
    pass


class LocalizedStartsWith(LocalizedLookupMixin, StartsWith):
    pass


class LocalizedIStartsWith(LocalizedLookupMixin, IStartsWith):
    pass


class LocalizedEndsWith(LocalizedLookupMixin, EndsWith):
    pass


class LocalizedIEndsWith(LocalizedLookupMixin, IEndsWith):
    pass


class LocalizedIsNullWith(LocalizedLookupMixin, IsNull):
    pass


class LocalizedRegexWith(LocalizedLookupMixin, Regex):
    pass


class LocalizedIRegexWith(LocalizedLookupMixin, IRegex):
    pass