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
   

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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
   

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4. https://github.com/discourse/discourse/blob/master/app/models/topic.rb
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14. !!class!Article!!!!!attr_accessor!:moderation_option
    !
    !!!!attr_accessible!:text,!:reply_to_i
    !
    !!!!belongs_to!:topic
    !!!!belongs_to!:user,!!!!!:class_name!
    !!!!belongs_to!:reply_to,!:class_name!
    

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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
    

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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
    

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17. !!!!!end
    !!!end
    !!!
    !!!def!tag_names=(tag_list)
    !!!!!assign_tag_list!tag_list
    !!!end
    !!!private
    !!!def!subscribe_replier
    !!!!!if!topic!&&!user
    

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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!<!!!!!!end!
    !!!!end
    !!end
    

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19. !!class!Article!!!!!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!<!!!!!!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!<!!!!!!end!
    !!!!end
    !!end
    

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20. before_validation
    after_validation
    before_save
    before_create
    after_create
    after_save
    after_commit
    

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32. $PODFSOT
    

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34. .JYJOT
    

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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
    

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36. ActiveSupport::Concern
    

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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
    

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38. class!Article!!!include!Taggable
    

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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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43. %3:OFTT
    

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45. l0⒏DJBMTPMVUJPOzUP
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46. https://github.com/rails/rails/commit/f6bbc3f582bfc16da3acc152c702b04102fcab81
    

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47. app/controllers/concerns
    app/models/concerns
    

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48. 8IBU
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50. http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
    

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51. http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
    

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52. https://twitter.com/hakunin/statuses/113364211727482880
    

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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
    

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58. http://blog.8thlight.com/eric-meyer/2012/11/16/composition-over-mixins.html
    

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59. http://blog.8thlight.com/eric-meyer/2012/11/16/composition-over-mixins.html
    

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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
    

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63. http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns
    

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65. article.method(:tag_names).source_location
    #"=>"["./app/models/concerns/taggable.rb","23]
    

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70. #"app/models/article.rb
    class!Article!!!include!Accessors
    !!include!Validations
    !!include!Associations
    !!include!Scopes
    !!#"...
    end
    

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71. #"app/models/article.rb
    class!Article!!!include!Taggable
    !!include!Searchable
    !!include!Movable
    !!include!Visible
    !!include!Trashable
    !!#"...
    end
    

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75. has_one
    

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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"
    

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78. class!Scheduling!!!#"...
    !!include!Workflow
    

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79. class!SchedulingsController!

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80. class!SchedulingsController!class!WorkflowsController!

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83. class!Workflow!!!#"...
    !!belongs_to!:scheduling
    

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84. class!Scheduling!!!#"...
    !!has_one!:workflow
    

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89. ActiveModel
    

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90. 'PSNPCKFDUT
    

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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/
    

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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/
    

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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/
    

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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/
    

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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/
    

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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/
    

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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!!!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/
     

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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!!!def!create
     http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
     

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102. class!SignupsController!!!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/
     

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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
     

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104. class!Signup!!!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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105. $POUSPMMFST
     

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107. http://weblog.jamisbuck.org/2006/10/18/skinny-controller-fat-model
     

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109. class!CommentsController!!!#...
     !!def!create
     !!!!@comment!=!@post.comments.build(post_params)
     !!!!if!@comment.save
     !!!!!!redirect_to!@comment
     !!!!else
     !!!!!!render!action:!'new'
     !!!!end
     !!end
     

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110. https://gist.github.com/2838490#gistcomment-356060
     

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111. class!CommentsController!!!#...
     !!
     !!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
     

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112. http://david.heinemeierhansson.com/2012/emails-are-views.html
     

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113. https://twitter.com/dhh/status/283832623023927296
     

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