NFS exports restored as read-only rockstor#2912

Fix translation of DB dump derived config-save field names to
NFS export create API field names.

Affects Web-UI surfaced NFS export config of:
- Access type ('Writable'/'Read only')
- Response type ('async'/'sync')
for NFS exports created via a config restore process.

Note that we maintain DB dump derived config-save field names
in the generated API calls (ignored currently), to enable
future API field name alignment to DB model field names.
At which point the additional fields added here to the API
payload would themselves become redundant and up for
deprecation, and in the change-over period ignored.

src/rockstor/storageadmin/views/config_backup.py

@@ -119,6 +119,11 @@ def restore_samba_exports(ml: list):
 
 
 def restore_nfs_exports(ml: list):
+    """
+    Parses storageadmin model list from config-backup DB dump.
+    Assumes Share mount-point is Share name.
+    @param ml: Model list (storageadmin)
+    """
     logger.info("Started restoring NFS exports.")
     exports = []
     export_groups = {}
@@ -127,13 +132,21 @@ def restore_nfs_exports(ml: list):
         if m["model"] == "storageadmin.nfsexport":
             exports.append(m["fields"])
         elif m["model"] == "storageadmin.nfsexportgroup":
+            logger.debug(f"Processing nfsexportgroup = {m}")
             m["fields"]["pk"] = m["pk"]
-            export_groups[m["pk"]] = m["fields"]
+            # Derive API field names & structure from nfsexportgroup DB dump field names:
+            nfse_api_fields: dict = m["fields"]
+            # Maintaining "editable" and "syncable" enables future API sync to DB model.
+            if "editable" in nfse_api_fields:  # 'mod_choice' from 'editable'
+                nfse_api_fields["mod_choice"] = nfse_api_fields["editable"]
+            if "syncable" in nfse_api_fields:  # 'sync_choice' from 'syncable'
+                nfse_api_fields["sync_choice"] = nfse_api_fields["syncable"]
+            export_groups[m["pk"]] = nfse_api_fields
         elif m["model"] == "storageadmin.advancednfsexport":
             adv_exports["entries"].append(m["fields"]["export_str"])
     for e in exports:
         if len(e["mount"].split("/")) != 3:
-            logger.info("skipping nfs export with mount: {}".format(e["mount"]))
+            logger.info(f"skipping nfs export with mount: {e['mount']}")
             continue
         e["shares"] = [e["mount"].split("/")[2]]
         payload = dict(export_groups[e["export_group"]], **e)