Keep your ActiveRecord models manageable the Rails way

Rails is awesome! It makes very easy and fun to start new projects. However, as your application grows, you will eventually need to come off the Rails. Otherwise your codebase will become completely unmanageable. Everyone knows that.

You'll need presenters and a service layer, including role and use-case objects. DCI will be great too or, alternatively, you can go Hexagonal. After all, the web is just a delivery mechanism, the database is a mere persistence strategy and, of course, “Rails is a detail”.

But… Wait a minute! Is all that really true? Does the Golden Path no longer work as your application becomes larger? How is it, then, that Rails claims to be “optimised for sustainable productivity”?

Criticising Rails is so last year! This time we'll revisit the patterns and conventions that Rails encourages and push them to the limit to see what happens. We'll seek examples of large Rails applications keeping their models manageable without derailing. We'll also discuss the trade-offs of running on and off the Rails. And, maybe, we'll finally learn how to stop worrying and love the Rails way!

Transcript

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2. require_dependency,'topic_view' require_dependency,'rate_limiter' require_dependency,'text_sentinel' require_dependency,'text_cleaner' class,Topic,<,ActiveRecord::Base ,,include,ActionView::Helpers ,,include,RateLimiter::OnCreateRecord ,,def,self.max_sort_order ,,,,2**31,7,1 https://github.com/discourse/discourse/blob/master/app/models/topic.rb
3. require_dependency,'slug' require_dependency,'avatar_lookup' require_dependency,'topic_view' require_dependency,'rate_limiter' require_dependency,'text_sentinel' require_dependency,'text_cleaner' class,Topic,<,ActiveRecord::Base ,,include,ActionView::Helpers ,,include,RateLimiter::OnCreateRecord ,,def,self.max_sort_order ,,,,2**31,7,1 ,,end ,,def,self.featured_users_count ,,,,4 ,,end ,,versioned,if:,:new_version_required? ,,acts_as_paranoid ,,after_recover,:update_flagged_posts_count ,,after_destroy,:update_flagged_posts_count ,,rate_limit,:default_rate_limiter ,,rate_limit,:limit_topics_per_day https://github.com/discourse/discourse/blob/master/app/models/topic.rb
4. https://github.com/discourse/discourse/blob/master/app/models/topic.rb 
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14. !!class!Article!<!ActiveRecord::Base !!!!attr_accessor!:moderation_option ! !!!!attr_accessible!:text,!:reply_to_i ! !!!!belongs_to!:topic !!!!belongs_to!:user,!!!!!:class_name! !!!!belongs_to!:reply_to,!:class_name!
15. !!!belongs_to!:user,!!!!!:class_name!=>!Fore !!!belongs_to!:reply_to,!:class_name!=>!"Pos !!!has_many!:replies,!:class_name!!=>!"Post" !!!!!!!!!!!!!!!!!!!!!!:foreign_key!=>!"reply !!!!!!!!!!!!!!!!!!!!!!:dependent!!!=>!:nulli !!! !!!has_many!:taggings !!!has_many!:tags,!:through!=>!:taggings !!!validates!:text,!:presence!=>!true !!!delegate!:forum,!:to!=>!:topic !!!after_create!:set_topic_last_post_at !!!after_create!:skip_pending_review
16. !!!!end !!!!def!pending_review !!!!!!where!:state!=>!'pending_review' !!!!end !!!!def!spam !!!!!!where!:state!=>!'spam' !!!!end !!!! !!!!def!tagged_with(tag) !!!!!!joins(:taggings!=>!:tags).where(:tags!=>!{!:name!=>!tag!}) !!!!end !!!!def!visible !!!!!!joins(:topic).where(:forem_topics!=>!{!:hidden!=>!false!}) !!!!end !!end !! !!def!tag_names=(tag_list) !!!!assign_tag_list!tag_list !!end !!private
17. !!!!!end !!!end !!! !!!def!tag_names=(tag_list) !!!!!assign_tag_list!tag_list !!!end !!!private !!!def!subscribe_replier !!!!!if!topic!&&!user
18. ! !!!!def!blacklist_user !!!!!!user.update_attribute(:forem_state,!"spam")!if!user !!!!end !!!! !!!!def!assign_tag_list(tag_list) !!!!!!tag_names!=!tag_list.gsub(/\s+/,!"").split(",") !!!!!!existing!=!self.tags.map!{|t|!t.name!} !!!!!!(existing!@!tag_names).each!do!|name| !!!!!!!!self.tags.delete!Tag.find_by_name(name) !!!!!!end !!!!!!tag_names.each!do!|name| !!!!!!!!self.tags!<<!Tag.find_or_create_by_name(name) !!!!!!end! !!!!end !!end
19. !!class!Article!<!ActiveRecord::Base !!!!attr_accessor!:moderation_option ! !!!!attr_accessible!:text,!:reply_to_id,!:tag_names ! !!!!belongs_to!:topic !!!!belongs_to!:user,!!!!!:class_name!=>!Forem.user_class.to_s !!!!belongs_to!:reply_to,!:class_name!=>!"Post" ! !!!!has_many!:replies,!:class_name!!=>!"Post", !!!!!!!!!!!!!!!!!!!!!!!:foreign_key!=>!"reply_to_id", !!!!!!!!!!!!!!!!!!!!!!!:dependent!!!=>!:nullify !!!! !!!!has_many!:taggings !!!!has_many!:tags,!:through!=>!:taggings ! !!!!validates!:text,!:presence!=>!true ! !!!!delegate!:forum,!:to!=>!:topic ! !!!!after_create!:set_topic_last_post_at !!!!after_create!:skip_pending_review !!!!after_save!:email_topic_subscribers ! !!!!class!<<!self !!!!!!def!by_created_at !!!!!!!!order!:created_at !!!!!!end ! !!!!!!def!pending_review !!!!!!!!where!:state!=>!'pending_review' !!!!!!end ! !!!!!!def!spam !!!!!!!!where!:state!=>!'spam' !!!!!!end !!!!!! !!!!!!def!tagged_with(tag) !!!!!!!!joins(:taggings!=>!:tags).where(:tags!=>!{!:name!=>!tag!}) !!!!!!end ! !!!!!!def!visible !!!!!!!!joins(:topic).where(:forem_topics!=>!{!:hidden!=>!false!}) !!!!!!end !!!!end !!!! !!!!def!tag_names=(tag_list) !!!!!!assign_tag_list!tag_list !!!!end ! !!!!private ! !!!!def!subscribe_replier !!!!!!if!topic!&&!user !!!!!!!!topic.subscribe_user(user.id) !!!!!!end !!!!end ! !!!!def!set_topic_last_post_at !!!!!!topic.update_attribute(:last_post_at,!created_at) !!!!end ! !!!!def!blacklist_user !!!!!!user.update_attribute(:forem_state,!"spam")!if!user !!!!end !!!! !!!!def!assign_tag_list(tag_list) !!!!!!tag_names!=!tag_list.gsub(/\s+/,!"").split(",") !!!!!!existing!=!self.tags.map!{|t|!t.name!} !!!!!!(existing!@!tag_names).each!do!|name| !!!!!!!!self.tags.delete!Tag.find_by_name(name) !!!!!!end !!!!!!tag_names.each!do!|name| !!!!!!!!self.tags!<<!Tag.find_or_create_by_name(name) !!!!!!end! !!!!end !!end
20. before_validation after_validation before_save before_create after_create after_save after_commit
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31. I8 <38 Rails
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35. module!DogFort !!def!call_dog !!!!puts!"this!is!dog!" !!end end class!Dog !!include!DogFort end http://schneems.com/post/21380060358/concerned-about-code-reuse
36. ActiveSupport::Concern
37. module!M !!extend!ActiveSupport::Concern !!!! !!included!do !!!!scope!:disabled,!where(:disabled!=>!true) !!end !! !!module!ClassMethods !!!!#"class"methods !!end !!#"instance"methods end http://api.rubyonrails.org/classes/ActiveSupport/Concern.html
38. class!Article!<!ActiveRecord::Base !!include!Taggable
39. module!Taggable !!extend!ActiveSupport::Concern !!included!do !!!!has_many!:taggings !!!!has_many!:tags,!through:!:taggings !!!!scope!:tagged_with,!B>(tag_name)!do !!!!!!joins(:tags).where(tags:!{!name:!tag_name!})! !!!!end !!end !!def!tag_list !!!!tags.pluck(:name).join(',!') !!end !!def!tag_list=(tag_list) !!!!assign_tag_list!tag_list !!end !!private !!def!assign_tag_list(tag_list) !!!!tag_names!=!tag_list.split(',').map(&:strip).uniq !!!!self.tags!=!tag_names.map!do!|tag_name|! !!!!!!Tag.where(name:!tag_name).first_or_initialize !!!!end !!end end
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42. module!Taggable !!extend!ActiveSupport::Concern !!included!do !!!!has_many!:taggings !!!!has_many!:tags,!through:!:taggings !!!!scope!:tagged_with,!B>(tag_name)!do !!!!!!joins(:tags).where(tags:!{!name:!tag_name!})! !!!!end !!end !!def!tag_list !!!!tags.pluck(:name).join(',!') !!end !!def!tag_list=(tag_list) !!!!assign_tag_list!tag_list !!end !!private !!def!assign_tag_list(tag_list) !!!!tag_names!=!tag_list.split(',').map(&:strip).uniq !!!!self.tags!=!tag_names.map!do!|tag_name|! !!!!!!Tag.where(name:!tag_name).first_or_initialize !!!!end !!end end
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46. https://github.com/rails/rails/commit/f6bbc3f582bfc16da3acc152c702b04102fcab81
47. app/controllers/concerns app/models/concerns
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50. http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
51. http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
52. https://twitter.com/hakunin/statuses/113364211727482880
53. Ruby Science The reference for writing fantastic Rails applications. https://learn.thoughtbot.com/products/13-ruby-science
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57. http://blog.8thlight.com/eric-meyer/2012/11/16/composition-over-mixins.html
58. http://blog.8thlight.com/eric-meyer/2012/11/16/composition-over-mixins.html
59. http://blog.8thlight.com/eric-meyer/2012/11/16/composition-over-mixins.html
60. http://blog.8thlight.com/eric-meyer/2012/11/16/composition-over-mixins.html
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62. http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns
63. http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns
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70. #"app/models/article.rb class!Article!<!ActiveRecord::Base !!include!Accessors !!include!Validations !!include!Associations !!include!Scopes !!#"... end
71. #"app/models/article.rb class!Article!<!ActiveRecord::Base !!include!Taggable !!include!Searchable !!include!Movable !!include!Visible !!include!Trashable !!#"... end
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77. create_table!"schedulings"!do!|t| !!#"... !!t.integer!!"workflow_offset" !!t.string!!!"workflow_asset_url" !!t.text!!!!!"workflow_details" !!t.boolean!!"workflow_sent" !!t.string!!!"workflow_web_url" !!t.string!!!"workflow_template_url"
78. class!Scheduling!<!ActiveRecord::Base !!#"... !!include!Workflow
79. class!SchedulingsController!<!ApplicationController
80. class!SchedulingsController!<!ApplicationController class!WorkflowsController!<!ApplicationController
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83. class!Workflow!<!ActiveRecord::Base !!#"... !!belongs_to!:scheduling
84. class!Scheduling!<!ActiveRecord::Base !!#"... !!has_one!:workflow
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89. ActiveModel
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91. http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
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94. class!Signup !!extend!ActiveModel::N !!include!ActiveModel:: !!include!ActiveModel:: !!attr_accessor!:name http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
95. History History class!Signup !!extend!ActiveModel::Naming !!include!ActiveModel::Conversion !!include!ActiveModel::Validations !!attr_accessor!:name !!attr_accessor!:company_name !!attr_accessor!:email !!validates!:email,!presence:!true http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
96. class!Signup !!extend!ActiveModel::Naming !!include!ActiveModel::Conversion !!include!ActiveModel::Validations !!attr_accessor!:name !!attr_accessor!:company_name !!attr_accessor!:email !!validates!:email,!presence:!true !!#"…"more"validations"… !!#"Virtual"models"are"never"themselves" !!def!persisted? http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
97. !!include!ActiveModel::Validations !!attr_accessor!:name !!attr_accessor!:company_name !!attr_accessor!:email !!validates!:email,!presence:!true !!#"…"more"validations"… !!#"Virtual"models"are"never"themselves"p !!def!persisted? !!!!false !!end !!def!save http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
98. !!attr_accessor!:name !!attr_accessor!:company_name !!attr_accessor!:email !!validates!:email,!presence:!true !!#"…"more"validations"… !!#"Virtual"models"are"never"themselves"persisted !!def!persisted? !!!!false !!end !!def!save !!!!if!valid? !!!!!!persist! !!!!!!true !!!!else !!!!!!false http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
99. !!def!persisted? !!!!false !!end !!def!save !!!!if!valid? !!!!!!persist! !!!!!!true !!!!else !!!!!!false !!!!end !!end private !!def!persist! http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
100. !!!!!!true !!!!else !!!!!!false !!!!end !!end private !!def!persist! !!!!@company!=!Company.create!(name:!company_name) !!!!@user!=!@company.users.create!(name:!name,!email:!email) !!end end class!SignupsController!<!ApplicationController !!def!create !!!!@signup!=!Signup.new(params[:signup]) !!!!if!@signup.save !!!!!!redirect_to!dashboard_path !!!!else !!!!!!render!"new" http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
101. class!Signup !!extend!ActiveModel::Naming !!include!ActiveModel::Conversion !!include!ActiveModel::Validations !!attr_accessor!:name !!attr_accessor!:company_name !!attr_accessor!:email !!validates!:email,!presence:!true !!#"…"more"validations"… !!#"Virtual"models"are"never"themselves"persisted !!def!persisted? !!!!false !!end !!def!save !!!!if!valid? !!!!!!persist! !!!!!!true !!!!else !!!!!!false !!!!end !!end private !!def!persist! !!!!@company!=!Company.create!(name:!company_name) !!!!@user!=!@company.users.create!(name:!name,!email:!email) !!end end class!SignupsController!<!ApplicationController !!def!create http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
102. class!SignupsController!<!ApplicationController !!def!create !!!!@signup!=!Signup.new(params[:signup]) !!!!if!@signup.save !!!!!!redirect_to!dashboard_path !!!!else !!!!!!render!"new" !!!!end !!end end http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
103. class!SimpleModel !!extend!ActiveModel::Naming !!include!ActiveModel::Conversion !!include!ActiveModel::Validations !!#"Virtual"models"are"never"themselves"persisted !!def!persisted? !!!!false !!end !!def!save !!!!if!valid? !!!!!!persist! !!!!!!true !!!!else !!!!!!false !!!!end !!end end
104. class!Signup!<!SimpleModel !!attr_accessor!:name, !!88888888888888:company_name, !!88888888888888:email !!validates!:email,!presence:!true !!#"…"more"validations"… !!def!persist! !!!!@company!=!Company.create!(name:!company_name) !!!!@user!=!@company.users.create!(name:!name,!email:!email) !!end end
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109. class!CommentsController!<!ApplicationController !!#... !!def!create !!!!@comment!=!@post.comments.build(post_params) !!!!if!@comment.save !!!!!!redirect_to!@comment !!!!else !!!!!!render!action:!'new' !!!!end !!end
110. https://gist.github.com/2838490#gistcomment-356060
111. class!CommentsController!<!ApplicationController !!#... !! !!def!create !!!!@comment!=!@post.comments.create!(post_params) !!!! !!!!Notifications.new_comment(@comment).deliver !!!! !!!!TwitterPoster.new(current_user,!@comment.body).post !!!!FacebookPoster.new(current_user,!@comment.body).post !!end
112. http://david.heinemeierhansson.com/2012/emails-are-views.html
113. https://twitter.com/dhh/status/283832623023927296
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