deindex.rb

class RemoveRecordFromSolr
  @queue = :high

  def self.perform(klass, id)
    klass.constantize.find(id).remove_from_index!
  end
end

index.rb

class IndexRecordInSolr
  @queue = :high

  def self.perform(klass, id)
    klass.constantize.find(id).index!
  end
end

observer.rb

class SolrObserver < ActiveRecord::Observer
  observe Company, Customer, Todo, Deal, Message, PhoneCall

  def after_save(record)
    return if ENV['POPULATING']

    Resque.enqueue IndexRecordInSolr, record.class.to_s, record.id
  end

  def before_destroy(record)
    return if ENV['POPULATING']

    Resque.enqueue RemoveRecordFromSolr, record.class.to_s, record.id
  end
end