Merge pull request #5056 from medha-14/GSoC

[GSOC 2025] Saving and Loading Custom Models

Author: valentinsulzer

src/pybamm/__init__.py

@@ -58,6 +58,7 @@
 from .expression_tree.operations.jacobian import Jacobian
 from .expression_tree.operations.convert_to_casadi import CasadiConverter
 from .expression_tree.operations.unpack_symbols import SymbolUnpacker
+from .expression_tree.operations.serialise import Serialise
 
 # Model classes
 from .models.base_model import BaseModel

src/pybamm/expression_tree/exceptions.py

@@ -66,3 +66,9 @@ class DiscretisationError(Exception):
     """A model could not be discretised."""
 
     pass
+
+
+class InvalidModelJSONError(Exception):
+    """Raised when a model JSON file is invalid or cannot be parsed."""
+
+    pass