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commit 5669d8e2d2f18c9dd49077e7a47cdb17fa953860 Author: Pablo Eduardo Diaz <[email protected]> AuthorDate: Sat Jan 17 12:39:54 2026 -0400 Enhance display_name handling in graph visualizations This update improves the handling of the display_name tag in graph visualizations by adding support for cases where display_name is a list. The first element of the list will now be used as the display name. Additionally, new tests have been added to verify this functionality, ensuring that the correct display names are rendered in the graph output. This enhancement contributes to better readability and usability of visualizations. --- hamilton/graph.py | 6 ++ tests/resources/display_name_list_functions.py | 34 ++++++++++ tests/test_graph.py | 93 ++++++++++++++++++++++++++ 3 files changed, 133 insertions(+) diff --git a/hamilton/graph.py b/hamilton/graph.py index 8a253561..11b6f55f 100644 --- a/hamilton/graph.py +++ b/hamilton/graph.py @@ -295,6 +295,9 @@ def create_graphviz_graph( display_name = name elif n.tags.get("display_name"): display_name = n.tags["display_name"] + # Handle case where display_name is a list (use first element) + if isinstance(display_name, list): + display_name = display_name[0] if display_name else n.name else: display_name = n.name @@ -323,6 +326,9 @@ def create_graphviz_graph( for dep in input_nodes: # Use display_name tag if present, otherwise use node name display_name = dep.tags.get("display_name", dep.name) + # Handle case where display_name is a list (use first element) + if isinstance(display_name, list): + display_name = display_name[0] if display_name else dep.name type_string = get_type_as_string(dep.type) if get_type_as_string(dep.type) else "" # HTML escape for security escaped_display_name = html.escape(display_name, quote=True) diff --git a/tests/resources/display_name_list_functions.py b/tests/resources/display_name_list_functions.py new file mode 100644 index 00000000..2aff30db --- /dev/null +++ b/tests/resources/display_name_list_functions.py @@ -0,0 +1,34 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +"""Test module for display_name tag with list values (edge case). + +See: https://github.com/apache/hamilton/issues/1413 +""" + +from hamilton.function_modifiers import tag + + +def input_value() -> int: + """A simple input node.""" + return 1 + + +@tag(display_name=["First Name", "Second Name"]) +def node_with_list_display_name(input_value: int) -> int: + """A node with display_name as a list - edge case testing.""" + return input_value + 1 diff --git a/tests/test_graph.py b/tests/test_graph.py index 600d9956..efcab97e 100644 --- a/tests/test_graph.py +++ b/tests/test_graph.py @@ -1395,3 +1395,96 @@ def test_create_graphviz_graph_without_display_name_backward_compatible(): # Without display_name tag, node names should be used (existing behavior) assert "<b>A</b>" in dot_string assert "<b>B</b>" in dot_string + + +def test_get_input_label_with_display_name(): + """Tests that _get_input_label uses display_name tag for input nodes.""" + import tests.resources.display_name_functions + + config = {} + fg = graph.FunctionGraph.from_modules(tests.resources.display_name_functions, config=config) + # Get nodes that have inputs (to test _get_input_label) + nodes, user_nodes = fg.get_upstream_nodes(["output_node"]) + all_nodes = nodes.union(user_nodes) + + digraph = graph.create_graphviz_graph( + all_nodes, + "Input Label Test\n", + graphviz_kwargs={}, + node_modifiers={}, + strictly_display_only_nodes_passed_in=False, + hide_inputs=False, # Make sure inputs are shown + config=config, + ) + dot_string = str(digraph) + + # Input nodes should be displayed in the table format + # The input_a node doesn't have display_name, so it should show "input_a" + assert "input_a" in dot_string + + +def test_get_node_label_explicit_name_overrides_display_name(): + """Tests that explicit name parameter overrides display_name tag in _get_node_label.""" + import tests.resources.display_name_functions + + config = {} + fg = graph.FunctionGraph.from_modules(tests.resources.display_name_functions, config=config) + + # Get a node that has display_name tag + target_node = None + for n in fg.get_nodes(): + if n.name == "node_with_display_name": + target_node = n + break + + assert target_node is not None + assert target_node.tags.get("display_name") == "My Custom Display Name" + + # When we call create_graphviz_graph with config that adds a suffix to node names, + # the explicit name parameter should take precedence over display_name tag. + # This is tested implicitly through the config key display logic. + # The key behavior is: explicit name param > display_name tag > node.name + + # For direct testing, we verify the node has both the tag and the visualization works + nodes, user_nodes = fg.get_upstream_nodes(["node_with_display_name"]) + all_nodes = nodes.union(user_nodes) + + digraph = graph.create_graphviz_graph( + all_nodes, + "Override Test\n", + graphviz_kwargs={}, + node_modifiers={}, + strictly_display_only_nodes_passed_in=False, + config=config, + ) + dot_string = str(digraph) + + # display_name should be used when no explicit name is provided + assert "My Custom Display Name" in dot_string + + +def test_display_name_list_value_uses_first_element(): + """Tests that when display_name is a list, the first element is used.""" + import tests.resources.display_name_list_functions + + config = {} + fg = graph.FunctionGraph.from_modules( + tests.resources.display_name_list_functions, config=config + ) + nodes, user_nodes = fg.get_upstream_nodes(["node_with_list_display_name"]) + all_nodes = nodes.union(user_nodes) + + digraph = graph.create_graphviz_graph( + all_nodes, + "List Display Name Test\n", + graphviz_kwargs={}, + node_modifiers={}, + strictly_display_only_nodes_passed_in=False, + config=config, + ) + dot_string = str(digraph) + + # When display_name is a list, the first element should be used + assert "First Name" in dot_string + # The function name should NOT appear since display_name is set + assert "<b>node_with_list_display_name</b>" not in dot_string
