Add config to disable schema dump after migration

* Add a config on Active Record named `dump_schema_after_migration`
* Schema dump doesn't happen if the config is set to false
* Set default value of the config to true
* Set config in generated production environment file to false
* Update configuration guide
* Update CHANGELOG

1 files changed, 6 insertions, 0 deletions

diff --git a/guides/source/configuring.md b/guides/source/configuring.md
index 669086edbe..561a69749a 100644
--- a/guides/source/configuring.md
+++ b/guides/source/configuring.md
@@ -292,6 +292,12 @@ All these configuration options are delegated to the `I18n` library.
 
 * `config.active_record.maintain_test_schema` is a boolean value which controls whether Active Record should try to keep your test database schema up-to-date with `db/schema.rb` (or `db/structure.sql`) when you run your tests. The default is true.
 
+* `config.active_record.dump_schema_after_migration` is a flag which
+  controls whether or not schema dump should happen (`db/schema.rb` or
+  `db/structure.sql`) when you run migrations. This is set to false in
+  `config/environments/production.rb` which is generated by Rails. The
+  default value is true if this configuration is not set.
+
 The MySQL adapter adds one additional configuration option:
 
 * `ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans` controls whether Active Record will consider all `tinyint(1)` columns in a MySQL database to be booleans and is true by default.