fix(workspace): keep declared group for workspace members in lockfile

news/3816.bugfix.md

@@ -0,0 +1 @@
+Keep workspace members in their explicitly declared dependency groups instead of adding them to ``default`` in the lockfile.

src/pdm/project/core.py

@@ -7,7 +7,7 @@
 import os
 import shutil
 import sys
-from collections.abc import Callable, Iterable, Mapping, Sequence
+from collections.abc import Callable, Collection, Iterable, Mapping, Sequence
 from copy import deepcopy
 from functools import cached_property, reduce
 from pathlib import Path
@@ -161,9 +161,19 @@ def iter_workspace_dependencies(self) -> Iterable[Requirement]:
         """Iterate over implicit editable requirements for workspace members."""
         yield from self.workspace.iter_dependencies()
 
-    def with_workspace_dependencies(self, requirements: Iterable[Requirement]) -> list[Requirement]:
-        """Return requirements with implicit workspace member dependencies included."""
-        return self.workspace.with_dependencies(requirements)
+    def with_workspace_dependencies(
+        self,
+        requirements: Iterable[Requirement],
+        *,
+        exclude: Collection[str] | None = None,
+    ) -> list[Requirement]:
+        """Return requirements with implicit workspace member dependencies included.
+
+        Members already declared in other dependency groups are skipped so they
+        keep those groups in the lockfile instead of being forced into
+        ``default`` (#3816).
+        """
+        return self.workspace.with_dependencies(requirements, exclude=exclude)
 
     def pyproject_content_hash(self, algo: str = "sha256") -> str:
         """Return a lockfile content hash including workspace members."""
@@ -554,7 +564,12 @@ def _get_dependencies(group: str) -> tuple[list[Requirement], set[str]]:
             for group, deps in extra_deps.items():
                 group_deps[group].extend(deps)
         if "default" in group_deps and self.is_workspace_root:
-            group_deps["default"] = self.with_workspace_dependencies(group_deps["default"])
+            # Do not force workspace members that are already declared in other
+            # groups into default (keeps lockfile groups accurate) (#3816).
+            declared_elsewhere = {
+                req.identify() for group, deps in group_deps.items() if group != "default" for req in deps
+            }
+            group_deps["default"] = self.with_workspace_dependencies(group_deps["default"], exclude=declared_elsewhere)
         return group_deps
 
     @property

src/pdm/project/workspace.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import hashlib
-from collections.abc import Iterable
+from collections.abc import Collection, Iterable
 from functools import cached_property
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -87,9 +87,16 @@ def iter_dependencies(self) -> Iterable[Requirement]:
             req.groups = ["default"]
             yield req
 
-    def with_dependencies(self, requirements: Iterable[Requirement]) -> list[Requirement]:
+    def with_dependencies(
+        self,
+        requirements: Iterable[Requirement],
+        *,
+        exclude: Collection[str] | None = None,
+    ) -> list[Requirement]:
         result = list(requirements)
         seen = {req.identify() for req in result}
+        if exclude:
+            seen.update(exclude)
         for req in self.iter_dependencies():
             if req.identify() in seen:
                 continue

src/pdm/resolver/providers.py

@@ -312,7 +312,7 @@ def matches_gen() -> Iterator[Candidate]:
             reqs.sort(key=self.requirement_preference)
             if workspace_candidates := list(self._find_workspace_candidates(identifier)):
                 return (
-                    can
+                    can.copy_with(dataclasses.replace(can.req, groups=original_req.groups))
                     for can in workspace_candidates
                     if can not in incompat and all(self.is_satisfied_by(r, can) for r in reqs)
                 )

tests/test_project.py

@@ -110,6 +110,34 @@ def test_workspace_root_adds_members_as_implicit_editable_dependencies(project):
     assert member_dependency.str_path == "./packages/foo"
 
 
+def test_workspace_member_declared_in_dev_group_not_forced_into_default(project, pdm):
+    """Workspace members already in other groups must not be re-added to default (#3816)."""
+    project.pyproject.settings["workspace"] = {"members": ["packages/*"]}
+    project.pyproject.write()
+    member_path = project.root / "packages" / "foo"
+    member_path.mkdir(parents=True)
+    member_path.joinpath("pyproject.toml").write_text(
+        '[project]\nname = "foo"\nversion = "0.1.0"\n',
+        encoding="utf-8",
+    )
+    # Declare the member only in a dev/test group, not in main dependencies.
+    project.add_dependencies(
+        [parse_requirement("foo @ file:///${PROJECT_ROOT}/packages/foo", True)],
+        "test",
+        True,
+    )
+
+    all_deps = project._resolve_dependencies()
+    default_deps = project.get_dependencies("default", all_deps)
+    assert all(getattr(dep, "name", None) != "foo" for dep in default_deps)
+
+    test_deps = project.get_dependencies("test", all_deps)
+    assert any(getattr(dep, "name", None) == "foo" for dep in test_deps)
+
+    pdm(["lock"], obj=project, strict=True)
+    assert project.get_locked_repository().candidates["foo"].req.groups == ["test"]
+
+
 def test_add_member_to_workspace(project):
     project.pyproject.settings["workspace"] = {"members": []}
     project.pyproject.write()