#431

backend/app/services/shared_resource_id_allocator.rb

@@ -50,23 +50,20 @@ class SharedResourceIdAllocator
       raise
     end
 
+    # 明示-tic な Id. 指定は許可する．
+    return if record.id.present?
+
     next_id = record.class.uncached do
-      historical_max = HISTORY_IDS.fetch(space, []).map do |table, column|
+      historical_max = HISTORY_IDS.fetch(space, []).map { |table, column|
         quoted_table = connection.quote_table_name(table)
         quoted_column = connection.quote_column_name(column)
-        connection.select_value(
-            "SELECT MAX(#{ quoted_column }) FROM #{ quoted_table }").to_i
-      end.max.to_i
+        connection.select_value("SELECT MAX(#{ quoted_column }) FROM #{ quoted_table }").to_i
+      }.max.to_i
+
       [next_ids(connection, tables).max, historical_max + 1].max
     end
-    if record.id.present?
-      if record.id < next_id
-        raise ActiveRecord::RecordNotUnique, 'Shared ID is below the reserved position'
-      end
-    else
-      record.id = next_id
-    end
-    # The INSERT advances InnoDB's persistent counter, including explicit IDs.
+
+    record.id = next_id
   end
 
   def self.next_ids connection, tables