create and index date published. datacite/blog#122

app/controllers/dois_controller.rb

@@ -23,6 +23,8 @@ def index
           when "-created" then { created: { order: 'desc' }}
           when "updated" then { updated: { order: 'asc' }}
           when "-updated" then { updated: { order: 'desc' }}
+          when "published" then { published: { order: 'asc' }}
+          when "-published" then { published: { order: 'desc' }}
           when "relevance" then { "_score": { "order": "desc" }}
           else { updated: { order: 'desc' }}
           end

app/models/doi.rb

@@ -245,6 +245,7 @@ class Doi < ActiveRecord::Base
     }
     indexes :cache_key,                      type: :keyword
     indexes :registered,                     type: :date, ignore_malformed: true
+    indexes :published,                      type: :date, ignore_malformed: true
     indexes :created,                        type: :date, ignore_malformed: true
     indexes :updated,                        type: :date, ignore_malformed: true
 
@@ -300,6 +301,7 @@ def as_indexed_json(options={})
       "registered" => registered,
       "created" => created,
       "updated" => updated,
+      "published" => published,
       "client" => client.as_indexed_json,
       "provider" => provider.as_indexed_json,
       "resource_type" => resource_type.try(:as_indexed_json),
@@ -850,6 +852,10 @@ def date_updated
     updated
   end
 
+  def published
+    get_date(dates, "issued") || publication_year.to_s
+  end
+
   def cache_key
     timestamp = updated || Time.zone.now
     "dois/#{uid}-#{timestamp.iso8601}"

app/serializers/doi_serializer.rb

@@ -5,7 +5,7 @@ class DoiSerializer
   set_id :uid
   # don't cache dois, as works are cached using the doi model
 
-  attributes :doi, :prefix, :suffix, :identifiers, :creators, :titles, :publisher, :container, :publication_year, :subjects, :contributors, :dates, :language, :types, :related_identifiers, :sizes, :formats, :version, :rights_list, :descriptions, :geo_locations, :funding_references, :xml, :url, :content_url, :metadata_version, :schema_version, :source, :is_active, :state, :reason, :landing_page, :created, :registered, :updated
+  attributes :doi, :prefix, :suffix, :identifiers, :creators, :titles, :publisher, :container, :publication_year, :subjects, :contributors, :dates, :language, :types, :related_identifiers, :sizes, :formats, :version, :rights_list, :descriptions, :geo_locations, :funding_references, :xml, :url, :content_url, :metadata_version, :schema_version, :source, :is_active, :state, :reason, :landing_page, :created, :registered, :published, :updated
   attributes :prefix, :suffix, if: Proc.new { |object, params| params && params[:detail] }
 
   belongs_to :client, record_type: :clients
@@ -27,6 +27,10 @@ class DoiSerializer
     object.version_info
   end
 
+  attribute :published do |object|
+    object.respond_to?(:published) ? :published : nil
+  end
+
   attribute :is_active do |object|
     object.is_active.to_s.getbyte(0) == 1 ? true : false
   end