Add column definitions to a migration

Readme

rails g model user name:string avatar:attached

create_table :users do |t|
  t.string :name
  t.string :avatar_identifier
  t.string :avatar_extension
  t.integer :avatar_size
end

For more info look
http://stackoverflow.com/questions/5202008/ruby-on-rails-custom-migration-generator

migration_methods.rb

# rails g model user name:string avatar:attached
#
# create_table :users do |t|
#   t.string :name
#   t.string :avatar_identifier
#   t.string :avatar_extension
#   t.integer :avatar_size
# end
#
# For more info look
# http://stackoverflow.com/questions/5202008/ruby-on-rails-custom-migration-generator

require 'active_support'
require 'active_record'

class ExtraMigrationMethods
  module SchemaDefinitions

    module ExtraMethods
      def attachment(*args)
        options = args.extract_options!
        args.each do |col|
          column("#{col}_identifier", :string, options)
          column("#{col}_extension", :string, options)
          column("#{col}_size", :integer, options)
        end
      end

      def slug(*args)
        options = args.extract_options!
        options.merge!(null: false, index:true)
        args.each do |col|
          column("#{col}", :string, options)
        end
      end
    end

    def self.load!
      ::ActiveRecord::ConnectionAdapters::TableDefinition.class_eval { include ExtraMigrationMethods::SchemaDefinitions::ExtraMethods }
    end

  end
end


ActiveSupport.on_load :active_record do
  ExtraMigrationMethods::SchemaDefinitions.load!
end