Override field data within the XBlock runtime

Resolves an issue preventing students in self-paced courses from seeing all available discussion modules. ECOM-3733.

cms/envs/aws.py

@@ -283,6 +283,17 @@ else:
 DATABASES = AUTH_TOKENS['DATABASES']
 
 MODULESTORE = convert_module_store_setting_if_needed(AUTH_TOKENS.get('MODULESTORE', MODULESTORE))
+
+MODULESTORE_FIELD_OVERRIDE_PROVIDERS = ENV_TOKENS.get(
+    'MODULESTORE_FIELD_OVERRIDE_PROVIDERS',
+    MODULESTORE_FIELD_OVERRIDE_PROVIDERS
+)
+
+XBLOCK_FIELD_DATA_WRAPPERS = ENV_TOKENS.get(
+    'XBLOCK_FIELD_DATA_WRAPPERS',
+    XBLOCK_FIELD_DATA_WRAPPERS
+)
+
 CONTENTSTORE = AUTH_TOKENS['CONTENTSTORE']
 DOC_STORE_CONFIG = AUTH_TOKENS['DOC_STORE_CONFIG']
 # Datadog for events!

cms/envs/common.py

@@ -383,6 +383,9 @@ XBLOCK_MIXINS = (
 
 XBLOCK_SELECT_FUNCTION = prefer_xmodules
 
+# Paths to wrapper methods which should be applied to every XBlock's FieldData.
+XBLOCK_FIELD_DATA_WRAPPERS = ()
+
 ############################ Modulestore Configuration ################################
 MODULESTORE_BRANCH = 'draft-preferred'
 
@@ -417,6 +420,10 @@ MODULESTORE = {
     }
 }
 
+# Modulestore-level field override providers. These field override providers don't
+# require student context.
+MODULESTORE_FIELD_OVERRIDE_PROVIDERS = ()
+
 #################### Python sandbox ############################################
 
 CODE_JAIL = {