Example Rails model that is indexed into Solr with Blacklight

microfilm.rb

class Microfilm < ActiveRecord::Base
  belongs_to :library
  belongs_to :location
  belongs_to :collection

  after_save    :update_solr unless ENV['DO_NOT_INDEX']
  after_destroy :remove_from_solr

  scope :with_shelf_mark, lambda { |*shelf_mark|
    where("#{quoted_table_name}.`shelf_mark` LIKE ?", "%#{shelf_mark.flatten.first}%") unless shelf_mark.flatten.first.blank?
  }

  def solr_id
    "microfilm-#{id}"
  end

  def as_solr
    {
      :id                        => solr_id,
      :title_display             => solr_id,
      :format                    => self.class.name,
      :library_facet             => library.name,
      :city_facet                => library.city_name,
      :shelf_mark_display        => shelf_mark,
      :mss_name_display          => mss_name,
      :mss_note_display          => mss_note,
      :collection_facet          => collection.name,
      :reel_display              => reel,
      :hesburgh_location_display => location.name
    }.reject{|key, value| value.blank?}
  end

  def to_solr
    Blacklight.solr.add as_solr
  end

  def update_solr
    to_solr
    Blacklight.solr.commit
  end

  private

  def remove_from_solr
    Blacklight.solr.delete_by_id solr_id
    Blacklight.solr.commit
  end

end