set_props does not work with Patch() #3101
Description
Describe the bug
set_props does not work with Patch. I guess, it replaces the Figure object with a Patch object instead of merging them.
As a result, in order to update a figure partially, one has to use old-style Output in server-side callbacks.
I haven't seen anything in the docs that would suggest that this is expected behaviour.
Expected behavior
set_props works with Patch or Figure equally well when updating Graph component's figure property.
Reproduce
Code to reproduce
import numpy as np
import plotly
from plotly import express as px, graph_objects as go, figure_factory as ff
from dash import Dash
from dash import html, dcc, callback, Input, Output, Patch, set_props
def make_figure():
x = np.arange(6)
y = np.random.randint(6, size=(10))
return go.Figure(go.Scatter(x=x, y=y))
fig1 = make_figure()
button1 = html.Button("Output()", id="button1", n_clicks=0)
button2 = html.Button("set_props", id="button2", n_clicks=0)
children = [button1, button2, dcc.Graph(id="fig1", figure=fig1)]
@callback(
Output("fig1", "figure", allow_duplicate=True),
Input("button1", "n_clicks"),
prevent_initial_call=True,
)
def regenerate_1(n_clicks):
fig1 = make_figure()
patch = Patch()
patch["data"] = fig1["data"]
fig1 = patch # comment/uncomment this
return fig1
@callback(
Input("button2", "n_clicks"),
prevent_initial_call=True,
)
def regenerate_2(n_clicks):
fig1 = make_figure()
patch = Patch()
patch["data"] = fig1["data"]
fig1 = patch # comment/uncomment this
set_props("fig1", {"figure": fig1})
app = Dash()
app.layout = html.Div(children)
app.run(jupyter_mode="external", port=8051)`pip list | grep dash` below
dash 2.18.1
dash-bootstrap-components 1.6.0
dash-core-components 2.0.0
dash-html-components 2.0.0
dash-mantine-components 0.12.1
dash-table 5.0.0