dynamically not required attributes for case logs

app/models/case_log.rb

@@ -97,6 +97,14 @@ private
   end
 
   def mandatory_fields
-    attributes.except(*AUTOGENERATED_FIELDS)
+    required = attributes.except(*AUTOGENERATED_FIELDS)
+
+    dynamically_not_required = []
+
+    if reason_for_leaving_last_settled_home != "Other"
+      dynamically_not_required << "other_reason_for_leaving_last_settled_home"
+    end
+
+    required.delete_if { |key, _value| dynamically_not_required.include?(key) }
   end
 end

spec/fixtures/complete_case_log.json

@@ -89,7 +89,7 @@
       "chr_letting": false,
       "cap_letting": false,
       "outstanding_rent_or_charges": 25,
-      "other_reason_for_leaving_last_settled_home": "Other reason",
+      "other_reason_for_leaving_last_settled_home": null,
       "accessibility_requirements_fully_wheelchair_accessible_housing": true,
       "accessibility_requirements_wheelchair_access_to_essential_rooms": false,
       "accessibility_requirements_level_access_housing": false,