Introducing generic as_tuples function which can be used to parse JSON directly.

Author: chisou

c8y_api/model/_parser.py

@@ -5,8 +5,42 @@
 from typing import Set
 
 from c8y_api.model._base import ComplexObject
+from c8y_api.model._util import _StringUtil
 
 
+def as_tuples(json_data, *path: str | tuple):
+    """Parse a JSON structure as tuples from paths.
+
+    Args:
+        json_data (dict):  A JSON structure as Python dict
+        path (*str|tuple):  Path(s) to extract from
+            the structure; Use dots to separate JSON levels; Arrays are not
+            supported.
+
+    Mote: This function automatically converts path segments from
+    Python snake_case to pascalCase, e.g. `creation_time` will match
+    both `creation_time` and `creationTime` fields.
+
+    Returns:
+        A tuple with `len(path)` elements containing the values as-is defined
+        in the JSON structure; an invalid path will result in None.
+    """
+    def resolve(segments, default=None):
+        json_level = json_data
+        for segment in segments[:-1]:
+            if segment in json_level:
+                json_level = json_level[segment]
+                continue
+            pascal_segment = _StringUtil.to_pascal_case(segment)
+            if pascal_segment in json_level:
+                json_level = json_level[pascal_segment]
+                continue
+            return default
+        return json_level.get(segments[-1], json_level.get(_StringUtil.to_pascal_case(segments[-1]), default))
+
+    # each p in path(s) can be a string or a tuple
+    return tuple(resolve(p[0].split('.'), p[1]) if isinstance(p, tuple) else resolve(p.split('.')) for p in path )
+
 class SimpleObjectParser(object):
     """A parser for simple (without fragments) Cumulocity database objects.