[GA-161] prefix node and edge collections by graph name in case of named graph (#22)

* prefox node and edge collections by graph name in case of named graph

* undo changes in digraph.py

* implement changes in main class and not in specific digraph class

* rem newline

---------

Co-authored-by: Anthony Mahanna <[email protected]>
Co-authored-by: Anthony Mahanna <[email protected]>

Author: hkernbach

nx_arangodb/classes/graph.py

@@ -40,8 +40,8 @@ def to_networkx_class(cls) -> type[nx.Graph]:
     def __init__(
         self,
         graph_name: str | None = None,
-        default_node_type: str = "node",
-        edge_type_func: Callable[[str, str], str] = lambda u, v: f"{u}_to_{v}",
+        default_node_type: str | None = None,
+        edge_type_func: Callable[[str, str], str] | None = None,
         db: StandardDatabase | None = None,
         *args: Any,
         **kwargs: Any,
@@ -70,6 +70,12 @@ def __init__(
 
         self.symmetrize_edges = False  # Does not apply to undirected graphs
 
+        prefix = f"{graph_name}_" if graph_name else ""
+        if default_node_type is None:
+            default_node_type = f"{prefix}node"
+        if edge_type_func is None:
+            edge_type_func = lambda u, v: f"{u}_to_{v}"  # noqa: E731
+
         self.default_node_type = default_node_type
         self.edge_type_func = edge_type_func
         self.default_edge_type = edge_type_func(default_node_type, default_node_type)