bug fix: #74 fix rebuild zoom records and imports setting of oai date…

…stamp by creating new method with appropriate logic\nand calling it where appropriate\n[#74 tagged:committed state:resolved responsible:walter]

app/views/search/oai_record.rxml

@@ -6,7 +6,7 @@ xml.tag!("OAI-PMH", "xmlns:xsi".to_sym => "http://www.w3.org/2001/XMLSchema-inst
     xml.record do
       xml.header do
         oai_dc_xml_oai_identifier(xml,item)
-        xml.datestamp(item.updated_at.utc.xmlschema)
+        oai_dc_xml_oai_datestamp(xml, item)
         oai_dc_xml_oai_set_specs(xml,item)
       end
       xml.metadata do

lib/importer_zoom.rb

@@ -24,7 +24,7 @@ def importer_oai_record_xml(options = { })
           xml.record do
             xml.header do
               oai_dc_xml_oai_identifier(xml,item)
-              xml.datestamp(Time.now.utc.xmlschema)
+              oai_dc_xml_oai_datestamp(xml, item)
               oai_dc_xml_oai_set_specs(xml,item)
             end
             xml.metadata do

lib/oai_dc_helpers.rb

@@ -30,6 +30,25 @@ def oai_dc_xml_oai_identifier(xml, item)
       xml.identifier("#{ZoomDb.zoom_id_stub}#{item.basket.urlified_name}:#{item.class.name}:#{item.id}")
     end
 
+    # Walter McGinnis, 2008-10-05
+    # adding better logic for determining last time the item was changed
+    # we want the datestamp to reflect the most recent change to the item
+    # that can be either when it is created/edited
+    # or when a relationship has been added
+    def oai_dc_xml_oai_datestamp(xml, item)
+      if item.content_item_relations.count == 0
+        xml.datestamp(item.updated_at.utc.xmlschema)
+      elsif item.class.name != 'Topic'
+        xml.datestamp(item.content_item_relations.last.updated_at.utc.xmlschema)
+      else
+        # topics can be on either side of the content_item_relation join model
+        # so to get all possible relations, you have to combine them
+        all_relations = item.content_item_relations + item.child_content_item_relations
+        all_relations.sort! { |a,b| a.updated_at <=> b.updated_at }
+        xml.datestamp(all_relations.last.updated_at.utc.xmlschema)
+      end
+    end
+
     # Walter McGinnis, 2008-06-16
     # adding oai pmh set support
     # assumes public zoom_db