Add 'ignore' to graph_transition command

Author: pfouque

README.md

@@ -429,6 +429,9 @@ $ ./manage.py graph_transitions > transitions.dot
 
 # Create a PNG image file only for specific model
 $ ./manage.py graph_transitions -o blog_transitions.png myapp.Blog
+
+# Exclude some transitions
+$ ./manage.py graph_transitions -e transition_1,transition_2 myapp.Blog
 ```
 
 ## Extensions

django_fsm/management/commands/graph_transitions.py

@@ -27,14 +27,18 @@ def node_label(field, state):
     return state
 
 
-def generate_dot(fields_data):  # noqa: C901, PLR0912
+def generate_dot(fields_data, ignore_transitions: list[str] | None = None):  # noqa: C901, PLR0912
+    ignore_transitions = ignore_transitions or []
     result = graphviz.Digraph()
 
     for field, model in fields_data:
         sources, targets, edges, any_targets, any_except_targets = set(), set(), set(), set(), set()
 
         # dump nodes and edges
         for transition in field.get_all_transitions(model):
+            if transition.name in ignore_transitions:
+                continue
+
             _targets = list(
                 (state for state in transition.target.allowed_states)
                 if isinstance(transition.target, (GET_STATE, RETURN_VALUE))
@@ -127,7 +131,7 @@ def add_arguments(self, parser):
             "-o",
             action="store",
             dest="outputfile",
-            help=("Render output file. Type of output dependent on file extensions. Use png or jpg to render graph to image."),
+            help="Render output file. Type of output dependent on file extensions. Use png or jpg to render graph to image.",
         )
         parser.add_argument(
             "--layout",
@@ -137,6 +141,13 @@ def add_arguments(self, parser):
             default="dot",
             help=f"Layout to be used by GraphViz for visualization. Layouts: {get_graphviz_layouts()}.",
         )
+        parser.add_argument(
+            "--exclude",
+            "-e",
+            action="store",
+            dest="exclude",
+            help="Ignore transitions with this name.",
+        )
         parser.add_argument("args", nargs="*", help=("[appname[.model[.field]]]"))
 
     def render_output(self, graph, **options):
@@ -153,9 +164,8 @@ def handle(self, *args, **options):
                 field_spec = arg.split(".")
 
                 if len(field_spec) == 1:
-                    app = apps.get_app(field_spec[0])
-                    models = apps.get_models(app)
-                    for model in models:
+                    app = apps.get_app_config(field_spec[0])
+                    for model in apps.get_models(app):
                         fields_data += all_fsm_fields_data(model)
                 if len(field_spec) == 2:  # noqa: PLR2004
                     model = apps.get_model(field_spec[0], field_spec[1])
@@ -166,7 +176,8 @@ def handle(self, *args, **options):
         else:
             for model in apps.get_models():
                 fields_data += all_fsm_fields_data(model)
-        dotdata = generate_dot(fields_data)
+
+        dotdata = generate_dot(fields_data, ignore_transitions=options.get("exclude", "").split(","))
 
         if options["outputfile"]:
             self.render_output(dotdata, **options)