provide metadata head_kind, head_uuid in api response

[arvados.git] / app / models / metadatum.rb

diff --git a/app/models/metadatum.rb b/app/models/metadatum.rb
index 445c728e270124828ed6d5ac8cd01cd2e8055bcf..a0cf51461ccaef3fe50b7080e239f70d25d82d8a 100644 (file)
--- a/app/models/metadatum.rb
+++ b/app/models/metadatum.rb
@@ -1,20 +1,70 @@
 class Metadatum < ActiveRecord::Base
+  include AssignUuid
+  include KindAndEtag
+  include CommonApiTemplate
   serialize :info, Hash
-
   before_validation :populate_native_target
-  include AssignUuid
+
+  def self.add_schema_columns
+    [ { name: :head_kind, type: :string },
+      { name: :head_uuid, type: :string } ]
+  end
+
+  api_accessible :superuser, :extend => :common do |t|
+    t.add :target_kind
+    t.add :target_uuid
+    t.add :metadata_class
+    t.add :key
+    t.add :value
+    t.add :info
+    t.add :head_kind
+    t.add :head_uuid
+  end
 
   def info
     @info ||= Hash.new
     super
   end
 
+  def head_kind
+    @head_kind if populate_head_object
+  end
+
+  def head_uuid
+    @head_uuid if populate_head_object
+  end
+
   protected
 
+  def populate_head_object
+    @head_object ||= begin
+      @head_kind = self.value.
+        sub(/^(.*)#.*/,'\1')
+      logger.debug @head_kind
+      class_name = @head_kind.
+        sub(/^orvos#/,'').
+        pluralize.
+        classify
+      logger.debug "class_name is #{class_name}"
+      @head_uuid = self.value.split('#').last
+      logger.debug "uuid is @head_uuid"
+      @head_object = class_name.
+        constantize.
+        where('uuid = ?', @head_uuid).
+        first
+      @head_object
+    rescue
+      @head_kind = nil
+      @head_uuid = nil
+      false
+    end || false unless @head_object == false
+  end
+
   def populate_native_target
     begin
       class_name = target_kind.
         sub(/^orvos#/,'').
+        pluralize.
         classify
       self.native_target_type = class_name
       self.native_target_id = class_name.