chore: descritpion.md are now optional (#417)

Signed-off-by: ThibaultFy <thibault.fouqueray@gmail.com>

changes/417.changed

@@ -0,0 +1 @@
+`description.md` are now `Optional` in `DatasampleSpec`. If no description file is given, `Substra` will generate a template indicating how to add a custom description file during dataset registration.

references/sdk_schemas.md

@@ -33,10 +33,12 @@ the 'paths' field.
 Specification for creating a dataset
 
 note : metadata field does not accept strings containing '__' as dict key
+
+note : If no description markdown file is given, create an empty one on the data_opener folder.
 ```text
 - name: <class 'str'>
 - data_opener: <class 'pathlib.Path'>
-- description: <class 'pathlib.Path'>
+- description: typing.Optional[pathlib.Path]
 - permissions: <class 'substra.sdk.schemas.Permissions'>
 - metadata: typing.Optional[typing.Dict[str, str]]
 - logs_permission: <class 'substra.sdk.schemas.Permissions'>

substra/sdk/schemas.py

@@ -19,6 +19,13 @@
     "summary_task": "task",
 }
 
+GENERATED_DESCRIPTION_CONTENT = """
+# No description given
+
+To add a dataset description, create a markdown file and pass it to your
+`substra.sdk.schemas.DatasetSpec` on your dataset opener registration.
+"""
+
 
 class BackendType(str, enum.Enum):
     REMOTE = "remote"
@@ -278,17 +285,30 @@ class DatasetSpec(_Spec):
     """Specification for creating a dataset
 
     note : metadata field does not accept strings containing '__' as dict key
+
+    note : If no description markdown file is given, create an empty one on the data_opener folder.
     """
 
     name: str
     data_opener: pathlib.Path  # Path to the data opener
-    description: pathlib.Path  # Path to the description file
+    description: Optional[pathlib.Path] = None  # Path to the description file
     permissions: Permissions
     metadata: Optional[Dict[str, str]] = None
     logs_permission: Permissions
 
     type_: typing.ClassVar[Type] = Type.Dataset
 
+    @pydantic.model_validator(mode="before")
+    @classmethod
+    def _check_description(cls, values):
+        if "description" not in values:
+            parent_path = pathlib.Path(values["data_opener"]).parent
+            description_path = parent_path / "generated_description.md"
+            with description_path.open("w", encoding="utf-8") as f:
+                f.write(GENERATED_DESCRIPTION_CONTENT)
+            values["description"] = description_path
+        return values
+
     class Meta:
         file_attributes = (
             "data_opener",

tests/sdk/test_schemas.py

@@ -4,6 +4,8 @@
 import pytest
 
 from substra.sdk.schemas import DataSampleSpec
+from substra.sdk.schemas import DatasetSpec
+from substra.sdk.schemas import Permissions
 
 
 @pytest.mark.parametrize("path", [pathlib.Path() / "data", "./data", pathlib.Path().cwd() / "data"])
@@ -38,3 +40,18 @@ def test_datasample_spec_paths_set_to_none():
 def test_datasample_spec_path_set_to_none():
     with pytest.raises(ValueError):
         DataSampleSpec(path=None, data_manager_keys=[str(uuid.uuid4())])
+
+
+def test_dataset_spec_no_description(tmpdir):
+
+    opener_path = tmpdir / "fake_opener.py"
+    permissions = Permissions(public=True, authorized_ids=[])
+
+    DatasetSpec(
+        name="Fake Dataset",
+        data_opener=str(opener_path),
+        permissions=permissions,
+        logs_permission=permissions,
+    )
+
+    assert (pathlib.Path(opener_path).parent / "generated_description.md").exists