With Ruby on Rails 5.2.0.Beta2 out now, its release candidate and official release is probably right around the corner. In efforts to clean up some of the code base, some methods have been deprecated. If you have been keeping your apps up to date with the latest stable releases, chances are that you have noticed these for some time coming as the via the deprecation notices in the application logs.

For easy searching purposes, I’ve parsed through the logs of all of the upcoming deprecations in Ruby on Rails 5.2.0. These were taken straight out of the CHANGELOGs.

We will be releasing January’s free screencast of some of the upcoming features in Ruby on Rails 5.2.0.

Overall, this has been a pretty light release for deprecations which is really nice. Hopefully, updating a Ruby on Rails app from 5.1.X to 5.2.X will be a fairly smooth transition.

Action Cable

https://github.com/rails/rails/blob/v5.2.0.beta2/actioncable/CHANGELOG.md

Removed Deprecations

• Removed deprecated evented redis adapter.

New Deprecations

• None

Action Mailer

https://github.com/rails/rails/blob/v5.2.0.beta2/actionmailer/CHANGELOG.md

Removed Deprecations

• None

New Deprecations

• None

Action Pack

https://github.com/rails/rails/blob/v5.2.0.beta2/actionpack/CHANGELOG.md

Removed Deprecations

• Remove deprecated ActionController::ParamsParser::ParseError

New Deprecations

• Deprecate ActionDispatch::TestResponse response aliases

Action View

https://github.com/rails/rails/blob/v5.2.0.beta2/actionview/CHANGELOG.md

Removed Deprecations

• Remove deprecated Erubis ERB handler.

New Deprecations

• None

Action Job

https://github.com/rails/rails/blob/v5.2.0.beta2/activejob/CHANGELOG.md

Removed Deprecations

• None

New Deprecations

• None

Active Model

https://github.com/rails/rails/blob/v5.2.0.beta2/activemodel/CHANGELOG.md

Removed Deprecations

• None

New Deprecations

• None

Active Record

https://github.com/rails/rails/blob/v5.2.0.beta2/activerecord/CHANGELOG.md

Removed Deprecations

• Remove deprecated method #sanitize_conditions.
• Remove deprecated method #scope_chain.
• Remove deprecated configuration .error_on_ignored_order_or_limit.
• Remove deprecated arguments from #verify!.
• Remove deprecated argument name from #indexes.
• Remove deprecated method ActiveRecord::Migrator.schema_migrations_table_name.
• Remove deprecated method supports_primary_key?.
• Remove deprecated method supports_migrations?.
• Remove deprecated methods initialize_schema_migrations_table and initialize_internal_metadata_table.
• Remove deprecated support to passing a class to :class_name on associations.
• Remove deprecated argument default from index_name_exists?.
• Remove deprecated support to quoted_id when typecasting an Active Record object.
• Remove deprecated #migration_keys.

New Deprecations

• Deprecate set_state method in TransactionState
• Deprecate delegating to arel in Relation.
• Deprecate passing arguments and block at the same time to count and sum in ActiveRecord::Calculations.
• Deprecate supports_statement_cache?.

Active Storage (new!)

https://github.com/rails/rails/blob/v5.2.0.beta2/activestorage/CHANGELOG.md

Removed Deprecations

• None

New Deprecations

• None

Active Support

https://github.com/rails/rails/blob/v5.2.0.beta2/activesupport/CHANGELOG.md

Removed Deprecations

• Remove deprecated halt_callback_chains_on_return_false option.
• Remove deprecated :if and :unless string filter for callbacks.

New Deprecations

• Deprecate secrets.secret_token.
• Deprecate Module#reachable? method.