Rails 5: awesome features and breaking changes

Presented at RailsClub in Moscow, September 2015
Video: https://www.youtube.com/watch?v=GbtepoRfH60

Links from this presentation:

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Clean:

Remove deprecation code
http://github.com/rails/rails/pull/18325

Remove respond_to/respond_with placeholder methods
http://github.com/rails/rails/commit/afd5e9a

Remove XML Serialization
http://github.com/rails/rails/pull/21161

Remove content_tag_for, div_for
http://github.com/rails/rails/pull/18411

Remove skip_action_callback
http://github.com/rails/rails/pull/19060

Remove rake doc:* tasks
http://github.com/rails/rails/commit/cd7cc52

Remove render nothing: true
http://github.com/rails/rails/pull/20336

Remove from ActionController *_filter callbacks (use *_action)
http://github.com/rails/rails/commit/7644a99

------

Pack:

Require Ruby 2.2.2
http://github.com/rails/rails/pull/19753

Beyond Ludicrous Speed
http://github.com/rails/rails/pull/21057

AS::Dependencies 10x faster
http://github.com/rails/rails/pull/21411

Use #start_with? and #[] for speed
http://github.com/rails/rails/pull/21100

Reference string constants
http://github.com/rails/rails/pull/17173

Use keyword arguments
http://github.com/rails/rails/pull/18323

Replace alias_method_chain with Module#prepend
http://github.com/rails/rails/pull/19434

------

Unpack:

Type ‘rails command’, not ‘rake’
http://github.com/rails/rails/pull/18878

_🍔.html.erb is a valid partial file
http://github.com/rails/rails/commit/da9038e

Require belongs_to by default
http://github.com/rails/rails/pull/18937

Drop ActiveRecord::Relation#uniq
http://github.com/rails/rails/pull/20198

More uniform arguments for ActiveRecord::Relation methods
http://github.com/rails/rails/pull/11898
http://github.com/rails/rails/pull/21505

Allow true to validate acceptance
http://github.com/rails/rails/pull/18439

More reversible migration actions
http://github.com/rails/rails/pull/20018

Allow empty arrays in deep munge
http://github.com/rails/rails/pull/16924

Accept collections in fresh_when
http://github.com/rails/rails/pull/18374

------

Decorate:

Add ActiveRecord::Relation#or
http://github.com/rails/rails/pull/16052

Add ActiveModel::Errors#codes
http://github.com/rails/rails/pull/18322

Add Integer#positive?, negative?
http://github.com/rails/rails/commit/e54277a

Add prev_weekday, next_weekday, weekend? to Date and DateTime
http://github.com/rails/rails/pull/18335

Add Method#source_code
http://github.com/rails/rails/pull/18473

Add forever-cache for static pages
http://github.com/rails/rails/pull/18394

Add AR::Base.has_secure_token
http://github.com/rails/rails/pull/18217

Add ActionController::Renderer
http://github.com/rails/rails/pull/18546

Add 'rake dev:cache'
http://github.com/rails/rails/pull/20961

------

Housewarm:

Returning false in callbacks no longer halts callback chains
http://github.com/rails/rails/pull/17227

ActionController::Parameters no longer inherits from HashWithIndifferentAccess
http://github.com/rails/rails/pull/20868

PredicateBuilder no longer accepts Class in conditions
http://github.com/rails/rails/pull/17916

Time columns are now time-zone aware by default
http://github.com/rails/rails/pull/15726

Transcript

1. Rails 5:
   awesome features
   and breaking changes
   claudiob.github.io
   

   View Slide

2. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   Releasing a
   major version
   ≈
   Moving to a
   new place
   

   View Slide

3. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   

   View Slide

4. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   

   View Slide

5. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   

   View Slide

6. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   

   View Slide

7. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   

   View Slide

8. Rails 1.x
   Rails 5.x
   Rails 4.x
   Rails 3.x
   Rails 2.x
   Rails 0.x
   

   View Slide

9. Releasing a
   major version
   ≈
   Moving to a
   new place pack
   grow
   housewarm
   decorate
   unpack
   clean
   

   View Slide

10. pack
    grow
    housewarm
    decorate
    unpack
    clean
    Remove deprecation code
    Remove respond_to/respond_with
    placeholder methods
    Remove XML Serialization
    Remove content_tag_for, div_for
    Remove skip_action_callback
    Remove rake doc:* tasks
    Remove render nothing: true
    Remove from ActionController
    *_filter callbacks (use *_action)
    #18325
    afd5e9a
    #21161
    #18411
    #19060
    cd7cc52
    #20336
    7644a99
    

    View Slide

11. pack
    grow
    housewarm
    decorate
    unpack
    clean
    Require Ruby 2.2.2
    Beyond Ludicrous Speed
    AS::Dependencies 10x faster
    Use #start_with? and #[] for speed
    Reference string constants
    Use keyword arguments
    Replace alias_method_chain with
    Module#prepend
    #19753
    #21057
    #21411
    #21100
    #18323
    #17173
    #19434
    

    View Slide

12. pack
    grow
    housewarm
    decorate
    unpack
    clean
    More uniform arguments for
    ActiveRecord::Relation methods
    Drop ActiveRecord::Relation#uniq
    Allow empty arrays in deep munge
    Require belongs_to by default
    Allow true to validate acceptance
    More reversible migration actions
    Accept collections in fresh_when
    Type ‘rails command’, not ‘rake’
    _.html.erb is a valid partial file
    #11898
    #16924
    #18937
    #18439
    #18374
    #18878
    #21505
    #20198
    #20018
    da9038e
    

    View Slide

13. pack
    grow
    housewarm
    decorate
    unpack
    clean
    Add ActiveRecord::Relation#or
    Add ActiveModel::Errors#codes
    Add Integer#positive?, negative?
    Add prev_weekday, next_weekday,
    weekend? to Date and DateTime
    Add Method#source_code
    Add forever-cache for static pages
    Add AR::Base.has_secure_token
    Add ActionController::Renderer
    Add ‘rake dev:cache’
    #16052
    e54277a
    #18335
    #18473
    #18217
    #18546
    #18322
    #18394
    #20961
    

    View Slide

14. pack
    grow
    housewarm
    decorate
    unpack
    clean
    Returning false in callbacks no
    longer halts callback chains
    ActionController::Parameters no
    longer inherits from
    HashWithIndifferentAccess
    PredicateBuilder no longer
    accepts Class in conditions
    Time columns are now time-zone
    aware by default
    #17227
    #20868
    #17916
    #15726
    

    View Slide

15. pack
    grow
    housewarm
    decorate
    unpack
    clean
    Rails API!
    ActionCable!
    New Turbolinks!
    New Sprockets!
    Exciting future!
    Thanks!
    

    View Slide