DM-40002: Try to support pydantic v1 and v2

.github/workflows/build.yaml

@@ -27,16 +27,18 @@ jobs:
           channels: conda-forge,defaults
           channel-priority: strict
           show-channel-urls: true
+          miniforge-variant: Mambaforge
+          use-mamba: true
 
       - name: Update pip/wheel infrastructure
         shell: bash -l {0}
         run: |
-          conda install -y -q pip wheel
+          mamba install -y -q pip wheel
 
       - name: Install sqlite
         shell: bash -l {0}
         run: |
-          conda install -y -q sqlite
+          mamba install -y -q sqlite
 
       # Postgres-14 is already installed from official postgres repo, but we
       # also need pgsphere which is not installed. The repo is not in the list,
@@ -52,13 +54,13 @@ jobs:
       - name: Install postgresql Python packages
         shell: bash -l {0}
         run: |
-          conda install -y -q psycopg2
+          mamba install -y -q psycopg2
           pip install testing.postgresql
 
       - name: Install cryptography package for moto
         shell: bash -l {0}
         run: |
-          conda install -y -q cryptography
+          mamba install -y -q cryptography
 
       - name: Install dependencies
         shell: bash -l {0}
@@ -69,13 +71,13 @@ jobs:
       - name: Install pytest packages
         shell: bash -l {0}
         run: |
-          conda install -y -q \
+          mamba install -y -q \
             pytest pytest-xdist pytest-openfiles pytest-cov
 
       - name: List installed packages
         shell: bash -l {0}
         run: |
-          conda list
+          mamba list
           pip list -v
 
       - name: Build and install

.github/workflows/build_docs.yaml

@@ -18,7 +18,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.11'
           cache: "pip"
           cache-dependency-path: "setup.cfg"
 

.github/workflows/rebase_checker.yaml

@@ -1,4 +1,3 @@
----
 name: Check that 'main' is not merged into the development branch
 
 on: pull_request

doc/changes/DM-40002.feature.rst

@@ -0,0 +1 @@
+Modified to work natively with Pydantic v1 and v2.

mypy.ini

@@ -71,7 +71,7 @@ disallow_untyped_defs = True
 disallow_incomplete_defs = True
 strict_equality = True
 warn_unreachable = True
-warn_unused_ignores = True
+warn_unused_ignores = False
 
 # ...except the modules and subpackages below (can't find a way to do line
 # breaks in the lists of modules).

python/lsst/daf/butler/_compat.py

@@ -0,0 +1,198 @@
+# This file is part of pipe_base.
+#
+# Developed for the LSST Data Management System.
+# This product includes software developed by the LSST Project
+# (https://www.lsst.org).
+# See the COPYRIGHT file at the top-level directory of this distribution
+# for details of code ownership.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+"""Code to support backwards compatibility."""
+
+__all__ = ["PYDANTIC_V2", "_BaseModelCompat"]
+
+import sys
+from collections.abc import Callable
+from typing import TYPE_CHECKING, Any
+
+from pydantic import BaseModel
+from pydantic.fields import FieldInfo
+from pydantic.version import VERSION as PYDANTIC_VERSION
+
+if sys.version_info >= (3, 11, 0):
+    from typing import Self
+else:
+    from typing import TypeVar
+
+    Self = TypeVar("Self", bound="_BaseModelCompat")  # type: ignore
+
+
+PYDANTIC_V2 = PYDANTIC_VERSION.startswith("2.")
+
+
+if PYDANTIC_V2:
+
+    class _BaseModelCompat(BaseModel):
+        """Methods from pydantic v1 that we want to emulate in v2.
+
+        Some of these methods are provided by v2 but issue deprecation
+        warnings.  We need to decide whether we are also okay with deprecating
+        them or want to support them without the deprecation message.
+        """
+
+        def json(
+            self,
+            *,
+            include: set[int] | set[str] | dict[int, Any] | dict[str, Any] | None = None,  # type: ignore
+            exclude: set[int] | set[str] | dict[int, Any] | dict[str, Any] | None = None,  # type: ignore
+            by_alias: bool = False,
+            skip_defaults: bool | None = None,
+            exclude_unset: bool = False,
+            exclude_defaults: bool = False,
+            exclude_none: bool = False,
+            encoder: Callable[[Any], Any] | None = None,
+            models_as_dict: bool = True,
+            **dumps_kwargs: Any,
+        ) -> str:
+            if dumps_kwargs:
+                raise TypeError("dumps_kwargs no longer supported.")
+            if encoder is not None:
+                raise TypeError("json encoder is no longer supported.")
+            # Can catch warnings and call BaseModel.json() directly.
+            return self.model_dump_json(
+                include=include,
+                exclude=exclude,
+                by_alias=by_alias,
+                exclude_defaults=exclude_defaults,
+                exclude_none=exclude_none,
+                exclude_unset=exclude_unset,
+            )
+
+        @classmethod
+        def parse_obj(cls, obj: Any) -> Self:
+            # Catch warnings and call BaseModel.parse_obj directly?
+            return cls.model_validate(obj)
+
+        if TYPE_CHECKING and not PYDANTIC_V2:
+            # mypy sees the first definition of a class and ignores any
+            # redefinition. This means that if mypy is run with pydantic v1
+            # it will not see the classes defined in the else block below.
+
+            @classmethod
+            def model_construct(cls, _fields_set: set[str] | None = None, **values: Any) -> Self:
+                return cls()
+
+            @classmethod
+            def model_validate(
+                cls,
+                obj: Any,
+                *,
+                strict: bool | None = None,
+                from_attributes: bool | None = None,
+                context: dict[str, Any] | None = None,
+            ) -> Self:
+                return cls()
+
+            def model_dump_json(
+                self,
+                *,
+                indent: int | None = None,
+                include: set[int] | set[str] | dict[int, Any] | dict[str, Any] | None = None,
+                exclude: set[int] | set[str] | dict[int, Any] | dict[str, Any] | None = None,
+                by_alias: bool = False,
+                exclude_unset: bool = False,
+                exclude_defaults: bool = False,
+                exclude_none: bool = False,
+                round_trip: bool = False,
+                warnings: bool = True,
+            ) -> str:
+                return ""
+
+            @property
+            def model_fields(self) -> dict[str, FieldInfo]:  # type: ignore
+                return {}
+
+            @classmethod
+            def model_rebuild(
+                cls,
+                *,
+                force: bool = False,
+                raise_errors: bool = True,
+                _parent_namespace_depth: int = 2,
+                _types_namespace: dict[str, Any] | None = None,
+            ) -> bool | None:
+                return None
+
+else:
+    from astropy.utils.decorators import classproperty
+
+    class _BaseModelCompat(BaseModel):  # type:ignore[no-redef]
+        """Methods from pydantic v2 that can be used in pydantic v1."""
+
+        @classmethod
+        def model_validate(
+            cls,
+            obj: Any,
+            *,
+            strict: bool | None = None,
+            from_attributes: bool | None = None,
+            context: dict[str, Any] | None = None,
+        ) -> Self:
+            return cls.parse_obj(obj)
+
+        def model_dump_json(
+            self,
+            *,
+            indent: int | None = None,
+            include: set[int] | set[str] | dict[int, Any] | dict[str, Any] | None = None,
+            exclude: set[int] | set[str] | dict[int, Any] | dict[str, Any] | None = None,
+            by_alias: bool = False,
+            exclude_unset: bool = False,
+            exclude_defaults: bool = False,
+            exclude_none: bool = False,
+            round_trip: bool = False,
+            warnings: bool = True,
+        ) -> str:
+            return self.json(
+                include=include,  # type: ignore
+                exclude=exclude,  # type: ignore
+                by_alias=by_alias,
+                exclude_unset=exclude_unset,
+                exclude_defaults=exclude_defaults,
+                exclude_none=exclude_none,
+            )
+
+        @classmethod  # type: ignore
+        def model_construct(cls, _fields_set: set[str] | None = None, **values: Any) -> Self:
+            # BaseModel.construct() is very close to what we previously
+            # implemented manually in each direct() method but does have one
+            # extra loop in it to fill in defaults and handle aliases.
+            return cls.construct(_fields_set=_fields_set, **values)
+
+        @classmethod
+        @classproperty
+        def model_fields(cls) -> dict[str, FieldInfo]:  # type: ignore
+            return cls.__fields__  # type: ignore
+
+        @classmethod
+        def model_rebuild(
+            cls,
+            *,
+            force: bool = False,
+            raise_errors: bool = True,
+            _parent_namespace_depth: int = 2,
+            _types_namespace: dict[str, Any] | None = None,
+        ) -> bool | None:
+            return cls.update_forward_refs()

python/lsst/daf/butler/_quantum_backed.py

@@ -31,13 +31,9 @@
 from typing import TYPE_CHECKING, Any
 
 from deprecated.sphinx import deprecated
+from lsst.daf.butler._compat import _BaseModelCompat
 from lsst.resources import ResourcePathExpression
 
-try:
-    from pydantic.v1 import BaseModel
-except ModuleNotFoundError:
-    from pydantic import BaseModel  # type: ignore
-
 from ._butlerConfig import ButlerConfig
 from ._deferredDatasetHandle import DeferredDatasetHandle
 from ._limited_butler import LimitedButler
@@ -597,7 +593,7 @@ def extract_provenance_data(self) -> QuantumProvenanceData:
         )
 
 
-class QuantumProvenanceData(BaseModel):
+class QuantumProvenanceData(_BaseModelCompat):
     """A serializable struct for per-quantum provenance information and
     datastore records.
 
@@ -749,19 +745,16 @@ def _to_uuid_set(uuids: Iterable[str | uuid.UUID]) -> set[uuid.UUID]:
             """
             return {uuid.UUID(id) if isinstance(id, str) else id for id in uuids}
 
-        data = QuantumProvenanceData.__new__(cls)
-        setter = object.__setattr__
-        setter(data, "predicted_inputs", _to_uuid_set(predicted_inputs))
-        setter(data, "available_inputs", _to_uuid_set(available_inputs))
-        setter(data, "actual_inputs", _to_uuid_set(actual_inputs))
-        setter(data, "predicted_outputs", _to_uuid_set(predicted_outputs))
-        setter(data, "actual_outputs", _to_uuid_set(actual_outputs))
-        setter(
-            data,
-            "datastore_records",
-            {
+        data = cls.model_construct(
+            predicted_inputs=_to_uuid_set(predicted_inputs),
+            available_inputs=_to_uuid_set(available_inputs),
+            actual_inputs=_to_uuid_set(actual_inputs),
+            predicted_outputs=_to_uuid_set(predicted_outputs),
+            actual_outputs=_to_uuid_set(actual_outputs),
+            datastore_records={
                 key: SerializedDatastoreRecordData.direct(**records)
                 for key, records in datastore_records.items()
             },
         )
+
         return data

python/lsst/daf/butler/core/datasets/ref.py

@@ -33,14 +33,11 @@
 import sys
 import uuid
 from collections.abc import Iterable
-from typing import TYPE_CHECKING, Any, ClassVar, Protocol, runtime_checkable
+from typing import TYPE_CHECKING, Any, ClassVar, Protocol, TypeAlias, runtime_checkable
 
+from lsst.daf.butler._compat import _BaseModelCompat
 from lsst.utils.classes import immutable
-
-try:
-    from pydantic.v1 import BaseModel, StrictStr, validator
-except ModuleNotFoundError:
-    from pydantic import BaseModel, StrictStr, validator  # type: ignore
+from pydantic import StrictStr, validator
 
 from ..configSupport import LookupKey
 from ..dimensions import DataCoordinate, DimensionGraph, DimensionUniverse, SerializedDataCoordinate
@@ -173,7 +170,7 @@ def makeDatasetId(
 _serializedDatasetRefFieldsSet = {"id", "datasetType", "dataId", "run", "component"}
 
 
-class SerializedDatasetRef(BaseModel):
+class SerializedDatasetRef(_BaseModelCompat):
     """Simplified model of a `DatasetRef` suitable for serialization."""
 
     id: uuid.UUID
@@ -224,22 +221,24 @@ def direct(
 
         This method should only be called when the inputs are trusted.
         """
-        node = SerializedDatasetRef.__new__(cls)
-        setter = object.__setattr__
-        setter(node, "id", uuid.UUID(id))
-        setter(
-            node,
-            "datasetType",
-            datasetType if datasetType is None else SerializedDatasetType.direct(**datasetType),
+        serialized_datasetType = (
+            SerializedDatasetType.direct(**datasetType) if datasetType is not None else None
+        )
+        serialized_dataId = SerializedDataCoordinate.direct(**dataId) if dataId is not None else None
+
+        node = cls.model_construct(
+            _fields_set=_serializedDatasetRefFieldsSet,
+            id=uuid.UUID(id),
+            datasetType=serialized_datasetType,
+            dataId=serialized_dataId,
+            run=sys.intern(run),
+            component=component,
         )
-        setter(node, "dataId", dataId if dataId is None else SerializedDataCoordinate.direct(**dataId))
-        setter(node, "run", sys.intern(run))
-        setter(node, "component", component)
-        setter(node, "__fields_set__", _serializedDatasetRefFieldsSet)
+
         return node
 
 
-DatasetId = uuid.UUID
+DatasetId: TypeAlias = uuid.UUID
 """A type-annotation alias for dataset ID providing typing flexibility.
 """