Handle change in Dash meta generation (#500)

* Advance permissible Dash versions

* Update version

---------

Co-authored-by: delsim <[email protected]>

Author: delsim

django_plotly_dash/dash_wrapper.py

@@ -763,7 +763,7 @@ def index(self, *args, **kwargs):  # pylint: disable=unused-argument
         scripts = self._generate_scripts_html()
         css = self._generate_css_dist_html()
         config = self._generate_config_html()
-        metas = self._generate_meta_html()
+        metas = self._version_independent_generate_meta()
         renderer = self._generate_renderer()
         title = getattr(self, 'title', 'Dash')
         if self._favicon:
@@ -787,6 +787,19 @@ def index(self, *args, **kwargs):  # pylint: disable=unused-argument
 
         return index
 
+    def _version_independent_generate_meta(self):
+        # Handle renaming of function - for older dash, call the older function if present
+        if hasattr(self, '_generate_meta_html'):
+            meta_str = self._generate_meta_html()
+        else:
+            metas = self._generate_meta()
+            meta_strs = []
+            for meta in metas:
+                contribs = [f'{k}="{v}"' for k, v in meta.items()]
+                meta_strs.append(f'<meta {" ".join(contribs)}>')
+            meta_str = "\n".join(meta_strs)
+        return meta_str
+
     def interpolate_index(self, **kwargs): #pylint: disable=arguments-differ
 
         if not self._return_embedded:

django_plotly_dash/version.py

@@ -23,4 +23,4 @@
 
 '''
 
-__version__ = "2.3.2"
+__version__ = "2.4.0"

setup.py

@@ -41,7 +41,7 @@
     'Documentation': 'http://django-plotly-dash.readthedocs.io/',
     },
     install_requires = ['plotly',
-                        'dash>=2.0,<2.10',
+                        'dash>=2.0,<3.0',
                         'dpd-components',
 
                         'dash-bootstrap-components',