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Larry Gebhardt lgebhardt

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@ProGM
ProGM / arel_cheatsheet_on_steroids.md
Last active January 20, 2026 18:30
Arel cheatsheet on Steroids

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias




  


  





    


          
    

      

        
        

          

              @kuczmama
          

          

            
                kuczmama
                / id_to_uuid.rake
            
            

              Last active
              July 24, 2022 22:06
            

              
                Migrate a rails project to use uuids
              
          

        

      

        


      

    
    


        



  


  

        

          
          # Inspired by http://www.madebyloren.com/posts/migrating-to-uuids-as-primary-keys
        

        

          
          

        

        

          
          task id_to_uuid: :environment do
        

        

          
            puts "[START] Convert id to uuid"
        

        

          
            ActiveRecord::Base.connection.enable_extension 'uuid-ossp' unless ActiveRecord::Base.connection.extensions.include? 'uuid-ossp'
        

        

          
            ActiveRecord::Base.connection.enable_extension 'pgcrypto' unless ActiveRecord::Base.connection.extensions.include? 'pgcrypto'
        

        

          
          

        

        

          
            table_names = ActiveRecord::Base.connection.tables - ["schema_migrations", "ar_internal_metadata", "migration_validators"]
        

        

          
            table_names.each do |table_name|
        

        

          
              puts "[CREATE] uuid column for #{table_name}"
        

  





    


  





    


          
    

      

        
        

          

              @neckhair
          

          

            
                neckhair
                / .dockerignore
            
            

              Created
              November 15, 2016 09:48
            

              
                Sample dockerignore for a Rails app
              
          

        

      

        


      

    
    


        



  


  

        

          
          .git
        

        

          
          .gitignore
        

        

          
          README.md
        

        

          
          

        

        

          
          #
        

        

          
          # OS X
        

        

          
          #
        

        

          
          .DS_Store
        

        

          
          .AppleDouble
        

        

          
          .LSOverride
        

  





    


  





    


          
    

      

        
        

          

              @vparihar01
          

          

            
                vparihar01
                / nokogiri_libxml_homebrew_lion_installation.sh
            
            

              Created
              June 25, 2013 07:01
            

              
                How to fix: Nokogiri Incompatible library version: nokogiri.bundle requires version 11.0.0 or later, but libxml2.2.dylib provides version 10.0.0.
dlopen bundle.open. Using homebrew on lion to install nokogiri and lixml
              
          

        

      

        


      

    
    


        



  


  

        

          
          FIXME:
        

        

          
            WARNING: Nokogiri was built against LibXML version 2.7.3, but has dynamically loaded 2.7.8
        

        

          
                            or
        

        

          
            ERROR -: Incompatible library version: nokogiri.bundle requires version 11.0.0 or later, but libxml2.2.dylib provides version 10.0.0
        

        

          
          

        

        

          
          

        

        

          
          gem uninstall nokogiri libxml-ruby
        

        

          
           
        

        

          
          brew update
        

        

          
          brew uninstall libxml2