Dump schema cache for custom connection

Today `rake db:schema:cache:dump` only supports dumping cache for a
single connection (`ActiveRecord::Base.connection`). This doesn't work
for apps with multiple databases.

This PR makes `DatabaseTasks` to provide an API for dumping schema cache
for any connection.

1 files changed, 1 insertions, 4 deletions

diff --git a/activerecord/lib/active_record/railties/databases.rake b/activerecord/lib/active_record/railties/databases.rake
index 25d79a6c7d..cf1c0fb423 100644
--- a/activerecord/lib/active_record/railties/databases.rake
+++ b/activerecord/lib/active_record/railties/databases.rake
@@ -269,10 +269,7 @@ db_namespace = namespace :db do
       task dump: [:environment, :load_config] do
         conn = ActiveRecord::Base.connection
         filename = File.join(ActiveRecord::Tasks::DatabaseTasks.db_dir, "schema_cache.yml")
-
-        conn.schema_cache.clear!
-        conn.data_sources.each { |table| conn.schema_cache.add(table) }
-        open(filename, "wb") { |f| f.write(YAML.dump(conn.schema_cache)) }
+        ActiveRecord::Tasks::DatabaseTasks.dump_schema_cache(conn, filename)
       end
 
       desc "Clears a db/schema_cache.yml file."