only dump schema information if migration table exists. Closes #14217

activerecord/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   `rake db:structure:dump` only dumps schema information if the schema
+    migration table exists.
+
+    Fixes #14217.
+
+    *Yves Senn*
+
 *   Reap connections that were checked out by now-dead threads, instead
     of waiting until they disconnect by themselves. Before this change,
     a suitably constructed series of short-lived threads could starve

activerecord/lib/active_record/railties/databases.rake

@@ -268,7 +268,8 @@ db_namespace = namespace :db do
       current_config = ActiveRecord::Tasks::DatabaseTasks.current_config
       ActiveRecord::Tasks::DatabaseTasks.structure_dump(current_config, filename)
 
-      if ActiveRecord::Base.connection.supports_migrations?
+      if ActiveRecord::Base.connection.supports_migrations? &&
+          ActiveRecord::SchemaMigration.table_exists?
         File.open(filename, "a") do |f|
           f.puts ActiveRecord::Base.connection.dump_schema_information
           f.print "\n"