Refactor JSON encoding to use plotly.py JSON engine

dash/_utils.py

@@ -20,6 +20,13 @@
 _strings = (type(""), type(utils.bytes_to_native_str(b"")))
 
 
+def to_json(value):
+    # pylint: disable=import-outside-toplevel
+    from plotly.io.json import to_json_plotly
+
+    return to_json_plotly(value)
+
+
 def interpolate_str(template, **data):
     s = template
     for k, v in data.items():

dash/dash.py

@@ -4,7 +4,6 @@
 import sys
 import collections
 import importlib
-import json
 import pkgutil
 import threading
 import re
@@ -22,8 +21,6 @@
 from werkzeug.debug.tbtools import get_current_traceback
 from pkg_resources import get_distribution, parse_version
 
-import plotly
-
 from .fingerprint import build_fingerprint, check_fingerprint
 from .resources import Scripts, Css
 from .dependencies import (
@@ -49,6 +46,7 @@
     split_callback_id,
     stringify_id,
     strip_relative_path,
+    to_json,
 )
 from . import _dash_renderer
 from . import _validate
@@ -547,7 +545,7 @@ def serve_layout(self):
 
         # TODO - Set browser cache limit - pass hash into frontend
         return flask.Response(
-            json.dumps(layout, cls=plotly.utils.PlotlyJSONEncoder),
+            to_json(layout),
             mimetype="application/json",
         )
 
@@ -705,7 +703,7 @@ def _generate_scripts_html(self):
 
     def _generate_config_html(self):
         return '<script id="_dash-config" type="application/json">{}</script>'.format(
-            json.dumps(self._config(), cls=plotly.utils.PlotlyJSONEncoder)
+            to_json(self._config())
         )
 
     def _generate_renderer(self):
@@ -1100,9 +1098,7 @@ def add_context(*args, **kwargs):
                 response = {"response": component_ids, "multi": True}
 
                 try:
-                    jsonResponse = json.dumps(
-                        response, cls=plotly.utils.PlotlyJSONEncoder
-                    )
+                    jsonResponse = to_json(response)
                 except TypeError:
                     _validate.fail_callback_output(output_value, output)
 

requires-install.txt

@@ -1,6 +1,6 @@
 Flask>=1.0.4
 flask-compress
-plotly
+plotly>=5.0.0
 dash-core-components==1.17.1
 dash-html-components==1.1.4
 dash-table==4.12.0

tests/integration/callbacks/test_malformed_request.py

@@ -33,7 +33,7 @@ def update_output(value):
         ),
     )
     assert response.status_code == 200
-    assert '"o1": {"children": 9}' in response.text
+    assert '"o1":{"children":9}' in response.text
 
     # now some bad ones
     outspecs = [