Clean up editable_metadata_fields.

cms/templates/widgets/metadata-edit.html

 <%
   import hashlib
+  import copy
   import json
   hlskey = hashlib.md5(module.location.url()).hexdigest()
 %>
 
-<% showHighLevelSource='source_code' in json_metadata_data and json_metadata_data['source_code']['explicitly_set'] %>
-% if 'source_code' in json_metadata_data:
-    <% del json_metadata_data['source_code'] %>
+<% showHighLevelSource='source_code' in editable_metadata_fields and editable_metadata_fields['source_code']['explicitly_set'] %>
+<% metadata_field_copy = copy.deepcopy(editable_metadata_fields) %>
+## Delete 'source_code' field (if it exists) so metadata editor view does not attempt to render it.
+% if 'source_code' in editable_metadata_fields:
+    ## source-edit.html needs access to the 'source_code' value, so delete from a copy.
+    <% del metadata_field_copy['source_code'] %>
 % endif
-<div class="wrapper-comp-settings metadata_edit" id="settings-tab" data-metadata='${json.dumps(json_metadata_data)}'/>
+<div class="wrapper-comp-settings metadata_edit" id="settings-tab" data-metadata='${json.dumps(metadata_field_copy)}'/>
 
 % if showHighLevelSource:
     <a href="#hls-modal-${hlskey}" style="color:yellow;" id="hls-trig-${hlskey}" >Edit High Level Source</a>

common/lib/xmodule/xmodule/mako_module.py

@@ -31,13 +31,9 @@ class MakoModuleDescriptor(XModuleDescriptor):
         """
         Return the context to render the mako template with
         """
-        # TODO: just return a single thing.
-        [editable_metadata, simplified_metadata] = self.editable_metadata_fields
         return {
             'module': self,
-            'editable_metadata_fields': editable_metadata,
-            'json_metadata_data' : simplified_metadata
-
+            'editable_metadata_fields': self.editable_metadata_fields
         }
 
     def get_html(self):

common/lib/xmodule/xmodule/x_module.py

@@ -626,8 +626,7 @@ class XModuleDescriptor(XModuleFields, HTMLSnippet, ResourceTemplates, XBlock):
         """
         inherited_metadata = getattr(self, '_inherited_metadata', {})
         inheritable_metadata = getattr(self, '_inheritable_metadata', {})
-        metadata = {}
-        simple_metadata = {}
+        metadata_fields = {}
         for field in self.fields:
 
             if field.scope != Scope.settings or field in self.non_editable_metadata_fields:
@@ -643,12 +642,6 @@ class XModuleDescriptor(XModuleFields, HTMLSnippet, ResourceTemplates, XBlock):
                 if field.name in inherited_metadata:
                     explicitly_set = False
 
-            metadata[field.name] = {'field': field,
-                                    'value': value,
-                                    'default_value': default_value,
-                                    'inheritable': inheritable,
-                                    'explicitly_set': explicitly_set}
-
             # We support the following editors:
             # 1. A select editor for fields with a list of possible values (includes Booleans).
             # 2. Number editor for integers and floats.
@@ -670,7 +663,7 @@ class XModuleDescriptor(XModuleFields, HTMLSnippet, ResourceTemplates, XBlock):
                 type = "Integer"
             elif isinstance(field, Float):
                 type = "Float"
-            simple_metadata[field.name] = {'field_name' : field.name,
+            metadata_fields[field.name] = {'field_name' : field.name,
                                            'type' : type,
                                            'display_name' : field.display_name,
                                            'value': field.to_json(value),
@@ -680,7 +673,7 @@ class XModuleDescriptor(XModuleFields, HTMLSnippet, ResourceTemplates, XBlock):
                                            'explicitly_set': explicitly_set,
                                            'help': field.help}
 
-        return metadata, simple_metadata
+        return metadata_fields
 
 
 class DescriptorSystem(object):