Initial commit. Basic models mostly done.

venv/lib/python3.8/site-packages/django/contrib/postgres/lookups.py

@@ -0,0 +1,76 @@
+from django.db.models import Lookup, Transform
+from django.db.models.lookups import Exact, FieldGetDbPrepValueMixin
+
+from .search import SearchVector, SearchVectorExact, SearchVectorField
+
+
+class PostgresSimpleLookup(FieldGetDbPrepValueMixin, Lookup):
+    def as_sql(self, qn, connection):
+        lhs, lhs_params = self.process_lhs(qn, connection)
+        rhs, rhs_params = self.process_rhs(qn, connection)
+        params = tuple(lhs_params) + tuple(rhs_params)
+        return '%s %s %s' % (lhs, self.operator, rhs), params
+
+
+class DataContains(PostgresSimpleLookup):
+    lookup_name = 'contains'
+    operator = '@>'
+
+
+class ContainedBy(PostgresSimpleLookup):
+    lookup_name = 'contained_by'
+    operator = '<@'
+
+
+class Overlap(PostgresSimpleLookup):
+    lookup_name = 'overlap'
+    operator = '&&'
+
+
+class HasKey(PostgresSimpleLookup):
+    lookup_name = 'has_key'
+    operator = '?'
+    prepare_rhs = False
+
+
+class HasKeys(PostgresSimpleLookup):
+    lookup_name = 'has_keys'
+    operator = '?&'
+
+    def get_prep_lookup(self):
+        return [str(item) for item in self.rhs]
+
+
+class HasAnyKeys(HasKeys):
+    lookup_name = 'has_any_keys'
+    operator = '?|'
+
+
+class Unaccent(Transform):
+    bilateral = True
+    lookup_name = 'unaccent'
+    function = 'UNACCENT'
+
+
+class SearchLookup(SearchVectorExact):
+    lookup_name = 'search'
+
+    def process_lhs(self, qn, connection):
+        if not isinstance(self.lhs.output_field, SearchVectorField):
+            self.lhs = SearchVector(self.lhs)
+        lhs, lhs_params = super().process_lhs(qn, connection)
+        return lhs, lhs_params
+
+
+class TrigramSimilar(PostgresSimpleLookup):
+    lookup_name = 'trigram_similar'
+    operator = '%%'
+
+
+class JSONExact(Exact):
+    can_use_none_as_rhs = True
+
+    def process_rhs(self, compiler, connection):
+        result = super().process_rhs(compiler, connection)
+        # Treat None lookup values as null.
+        return ("'null'", []) if result == ('%s', [None]) else result