refactor: use component_id instead of Template as slot fill cache key

src/django_components/utils.py

@@ -1,7 +1,9 @@
 import glob
+import random
 from pathlib import Path
-from typing import List, NamedTuple, Optional
+from typing import Callable, List, NamedTuple, Optional
 
+from django.template.base import Node, NodeList
 from django.template.engine import Engine
 
 from django_components.template_loader import Loader
@@ -35,3 +37,36 @@ def search(search_glob: Optional[str] = None, engine: Optional[Engine] = None) -
             component_filenames.append(Path(path))
 
     return SearchResult(searched_dirs=dirs, matched_files=component_filenames)
+
+
+def walk_nodelist(nodes: NodeList, callback: Callable[[Node], None]) -> None:
+    """Recursively walk a NodeList, calling `callback` for each Node."""
+    node_queue = [*nodes]
+    while len(node_queue):
+        node: Node = node_queue.pop()
+        callback(node)
+        node_queue.extend(get_node_children(node))
+
+
+def get_node_children(node: Node) -> NodeList:
+    """
+    Get child Nodes from Node's nodelist atribute.
+
+    This function is taken from `get_nodes_by_type` method of `django.template.base.Node`.
+    """
+    nodes = NodeList()
+    for attr in node.child_nodelists:
+        nodelist = getattr(node, attr, [])
+        if nodelist:
+            nodes.extend(nodelist)
+    return nodes
+
+
+def gen_id(length: int = 5) -> str:
+    # Generate random value
+    # See https://stackoverflow.com/questions/2782229
+    value = random.randrange(16**length)
+
+    # Signed hexadecimal (lowercase).
+    # See https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting
+    return f"{value:x}"