some fixes for different tests

django_iris/__init__.py

@@ -2,7 +2,14 @@
 from django.db.models.functions.datetime import Now
 from django.db.models.expressions import Exists, Func, Value, Col, OrderBy
 from django.db.models.functions.text import Chr, ConcatPair, StrIndex
+from django.db.models.functions import Cast
 from django.db.models.fields import TextField, CharField
+from django.db.models.lookups import BuiltinLookup
+from django.db.models.fields.json import (
+    KeyTransform,
+    KeyTransformExact,
+    compile_json_path,
+)
 
 from django_iris.compiler import SQLCompiler
 
@@ -65,7 +72,8 @@ def convert_streams(expressions):
 
 @as_intersystems(Exists)
 def exists_as_intersystems(self, compiler, connection, template=None, **extra_context):
-    template = "(SELECT COUNT(*) FROM (%(subquery)s))"
+    # template = "(SELECT COUNT(*) FROM (%(subquery)s))"
+    template = "EXISTS %(subquery)s"
     return self.as_sql(compiler, connection, template, **extra_context)
 
 
@@ -151,3 +159,37 @@ def orderby_as_intersystems(self, compiler, connection, **extra_context):
     # IRIS does not support order NULL
     copy.nulls_first = copy.nulls_last = False
     return copy.as_sql(compiler, connection, **extra_context)
+
+
+@as_intersystems(KeyTransformExact)
+def json_KeyTransformExact_as_intersystems(self, compiler, connection):
+    return self.as_sql(compiler, connection)
+
+
+@as_intersystems(KeyTransform)
+def json_KeyTransform_as_intersystems(self, compiler, connection):
+    # breakpoint()
+    # json_path = compile_json_path(key_transforms)
+    return f"{self.field.name}__{self.key_name}", []
+
+
+@as_intersystems(BuiltinLookup)
+def BuiltinLookup_as_intersystems(self, compiler, connection):
+    sql, params = self.as_sql(compiler, connection)
+    if compiler.in_get_order_by:
+        return "CASE WHEN %s THEN 1 ELSE 0 END" % (sql,), params
+    # if not compiler.in_get_select and not compiler.in_get_order_by:
+    return sql, params
+
+
+@as_intersystems(Cast)
+def cast_as_intersystems(self, compiler, connection, **extra_context):
+    if hasattr(self.source_expressions[0], "lookup_name"):
+        if self.source_expressions[0].lookup_name in ["gt", "gte", "lt", "lte"]:
+            return self.as_sql(
+                compiler,
+                connection,
+                template="CASE WHEN %(expressions)s THEN 1 ELSE 0 END",
+                **extra_context,
+            )
+    return self.as_sql(compiler, connection, **extra_context)

django_iris/compiler.py

@@ -1,15 +1,81 @@
+import itertools
+
 from django.core.exceptions import EmptyResultSet, FullResultSet
-from django.db.models.expressions import Col, Value
+from django.db.models.expressions import RawSQL
+from django.db.models.sql.where import AND
 from django.db.models.sql import compiler
+from django.db.models.fields.json import KeyTransform
+from django.db.models.expressions import DatabaseDefault
+
+
+class Flag:
+    value = False
+
+    def __init__(self, value):
+        self.value = value
+
+    def __enter__(self):
+        self.value = True
+        return True
+
+    def __exit__(self, *args):
+        self.value = False
+
+    def __bool__(self):
+        return self.value
+
 
 class SQLCompiler(compiler.SQLCompiler):
+    in_get_select = Flag(False)
+    in_get_order_by = Flag(False)
+#     def get_from_clause(self):
+#         result, params = super().get_from_clause()
+#         jsoncolumns = {}
+#         for column in self.query.select + tuple(
+#             [column for column in (col.lhs for col in self.query.where.children)]
+#         ):
+#             if isinstance(column, KeyTransform):
+#                 if column.field.name not in jsoncolumns:
+#                     jsoncolumns[column.field.name] = {}
+#                 jsoncolumns[column.field.name][
+#                     column.key_name
+#                 ] = f"{column.field.name}__{column.key_name}"
+#         []
+#         for field in jsoncolumns:
+#             self.query.where.add(RawSQL("%s is not null" % (field,), []), AND)
+#             cols = ", ".join(
+#                 [
+#                     f"{jsoncolumns[field][col_name]} VARCHAR PATH '$.{col_name}'"
+#                     for col_name in jsoncolumns[field]
+#                 ]
+#             )
+#             result.append(
+#                 f"""
+# , JSON_TABLE("{column.field.name}", '$' COLUMNS(
+# {cols}
+# ))
+# """
+#             )
+
+#         if "model_fields_nullablejsonmodel" in self.query.alias_map:
+#             breakpoint()
+#         return result, params
+
+    def get_select(self, with_col_aliases=False):
+        with self.in_get_select:
+            return super().get_select(with_col_aliases)
+
+    def get_order_by(self):
+        with self.in_get_order_by:
+            return super().get_order_by()
 
     def as_sql(self, with_limits=True, with_col_aliases=False):
         with_limit_offset = (with_limits or self.query.is_sliced) and (
             self.query.high_mark is not None or self.query.low_mark > 0
         )
         if self.query.select_for_update or not with_limit_offset:
-            return super().as_sql(with_limits, with_col_aliases)
+            query, params = super().as_sql(with_limits, with_col_aliases)
+            return query, params
         try:
             extra_select, order_by, group_by = self.pre_sql_setup()
 
@@ -79,7 +145,10 @@ def as_sql(self, with_limits=True, with_col_aliases=False):
                 order_by_result = "ORDER BY %s" % first_col
 
             if offset:
-                out_cols.append("ROW_NUMBER() %s AS row_number" % ("OVER (%s)" % order_by_result if order_by_result else ""))
+                out_cols.append(
+                    "ROW_NUMBER() %s AS row_number"
+                    % ("OVER (%s)" % order_by_result if order_by_result else "")
+                )
 
             result += [", ".join(out_cols), "FROM", *from_]
             params.extend(f_params)
@@ -154,19 +223,32 @@ def as_sql(self, with_limits=True, with_col_aliases=False):
                 ), tuple(sub_params + params)
 
             if offset:
-                query = "SELECT * FROM (%s) WHERE row_number between %d AND %d ORDER BY row_number" % (
-                    query,
-                    offset,
-                    limit,
+                query = (
+                    "SELECT * FROM (%s) WHERE row_number between %d AND %d ORDER BY row_number"
+                    % (
+                        query,
+                        offset,
+                        limit,
+                    )
                 )
             return query, tuple(params)
-        except:
-            return super().as_sql(with_limits, with_col_aliases)
+        except Exception:
+            query, params = super().as_sql(with_limits, with_col_aliases)
+            return query, params
 
 
 class SQLInsertCompiler(compiler.SQLInsertCompiler, SQLCompiler):
-    
+
     def as_sql(self):
+
+        if self.query.fields:
+            fields = self.query.fields
+            self.query.fields = [
+                field
+                for field in fields
+                if not isinstance(self.pre_save_val(field, self.query.objs[0]), DatabaseDefault)
+            ]
+
         if self.query.fields:
             return super().as_sql()
 
@@ -195,7 +277,7 @@ def as_sql(self):
         if self.connection._disable_constraint_checking:
             sql = "UPDATE %%NOCHECK" + sql[6:]
         return sql, params
-    
+
 
 class SQLAggregateCompiler(compiler.SQLAggregateCompiler, SQLCompiler):
     pass

django_iris/features.py

@@ -84,7 +84,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     only_supports_unbounded_with_preceding_and_following = False
 
     # Does the backend support JSONField?
-    supports_json_field = False
+    supports_json_field = True
     # Can the backend introspect a JSONField?
     can_introspect_json_field = False
     # Does the backend support primitives in JSONField?
@@ -106,13 +106,15 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_collation_on_charfield = True
     supports_collation_on_textfield = False
 
+    supports_boolean_expr_in_select_clause = False
+
     # Collation names for use by the Django test suite.
     test_collations = {
         # "ci": None,  # Case-insensitive.
         "cs": "EXACT",  # Case-sensitive.
         # "non_default": None,  # Non-default.
         # "swedish_ci": None,  # Swedish case-insensitive.
-        "virtual": None
+        "virtual": None,
     }
 
     @cached_property
@@ -162,12 +164,23 @@ def django_test_skips(self):
                 #     "datetimes.tests.DateTimesTests.test_datetimes_ambiguous_and_invalid_times",
                 # },
                 "IRIS does not have check contsraints": {
+                    "model_fields.test_jsonfield.JSONFieldTests.test_db_check_constraints",
                     "constraints.tests.CheckConstraintTests.test_validate",
                     "constraints.tests.CheckConstraintTests.test_validate_boolean_expressions",
                     "constraints.tests.UniqueConstraintTests.test_validate_expression_condition",
                 },
+                "Does not support expressions in default": {
+                    "field_defaults.tests.DefaultTests.test_full_clean",
+                    "basic.tests.ModelInstanceCreationTests.test_save_primary_with_db_default",
+                },
+                "Regex not supported": {
+                    "lookup.tests.LookupTests.test_regex",
+                    "lookup.tests.LookupTests.test_regex_backreferencing",
+                    "lookup.tests.LookupTests.test_regex_non_ascii",
+                    "lookup.tests.LookupTests.test_regex_non_string",
+                    "lookup.tests.LookupTests.test_regex_null",
+                },
             }
-
         )
         return skips
 
@@ -186,6 +199,19 @@ def django_test_skips(self):
         "schema.tests.SchemaTests.test_alter_text_field_to_time_field",
         "schema.tests.SchemaTests.test_alter_text_field_to_datetime_field",
         "schema.tests.SchemaTests.test_alter_text_field_to_date_field",
+        #
+        "lookup.tests.LookupQueryingTests.test_filter_exists_lhs",
+        "lookup.tests.LookupQueryingTests.test_filter_lookup_lhs",
+        "lookup.tests.LookupQueryingTests.test_filter_subquery_lhs",
+        "lookup.tests.LookupQueryingTests.test_filter_wrapped_lookup_lhs",
+        "lookup.tests.LookupTests.test_lookup_rhs",
+
+        "lookup.tests.LookupTests.test_regex",
+        "lookup.tests.LookupTests.test_regex_backreferencing",
+        "lookup.tests.LookupTests.test_regex_non_ascii",
+        "lookup.tests.LookupTests.test_regex_non_string",
+        "lookup.tests.LookupTests.test_regex_null",
+
     }
 
     # django_test_skips["IRIS Bugs"] = django_test_expected_failures