Merge branch 'f-casting-transformers' into ruqad

CHANGELOG.md

@@ -19,6 +19,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - ZipFileConverter that opens zip files and exposes their contents as
   File and Directory structure elements.
 - `linkahead-crawler` script as alias for `caosdb-crawler`.
+- New transformers of the form `cast_to_*` which allow casting variables to `int`, `float`,
+  `str` and `bool`.
 
 ### Changed ###
 

src/caoscrawler/validator.py

@@ -123,12 +123,14 @@ def convert_record(record: db.Record):
     return _apply_schema_patches(pobj)
 
 
-def validate(records: list[db.Record], schemas: dict[str, dict]) -> list[tuple[bool, list]]:
+def validate(records: list[db.Record], schemas: dict[str, dict]) -> list[tuple]:
     """
-    Validate a list of records against a list of possible JSON schemas.
-
-    It is tried to validate each schema from the list of schemas. If none of them validates
-    without error, it is assumed that it does not match at all.
+    Validate a list of records against a dictionary of schemas.
+    The keys of the dictionary are record types and the corresponding values are json schemata
+    associated with that record type. The current implementation assumes that each record that is
+    checked has exactly one parent and raises an error if that is not the case.
+    The schema belonging to a record is identified using the name of the first (and only) parent
+    of the record.
 
     Arguments:
     ----------
@@ -136,15 +138,16 @@ def validate(records: list[db.Record], schemas: dict[str, dict]) -> list[tuple[b
     records: list[db.Record]
       List of records that will be validated.
 
-    schemas: list[dict]
-      A list of JSON schemas generated using `load_json_schema_from_datamodel_yaml`.
+    schemas: dict[str, dict]
+      A dictionary of JSON schemas generated using `load_json_schema_from_datamodel_yaml`.
 
     Returns:
     --------
     A list of tuples, one element for each record:
 
-    - Index 0: A boolean that determines whether at least one schema matched for this record.
-    - Index 1: A list of schemas matching the record at this position of the list `records`.
+    - Index 0: A boolean that determines whether the schema belonging to the record type of the
+               record matched.
+    - Index 1: A validation error if the schema did not match or None otherwise.
     """
 
     retval = []