report on map coordinates

app/reports/subject_map_coordinates.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+# Report all map coordinates values in subjects
+# Invoke via:
+# bin/rails r -e production "SubjectMapCoordinates.report"
+class SubjectMapCoordinates
+  # Finds an object like this: https://argo.stanford.edu/view/druid:bb051ch9980
+  # "description": {
+  #   "subject": [
+  #      {
+  #           "value": "E 13°59'00\"--E 34°28'00\"/S 22°07'00\"--S 35°39'00\"",
+  #           "type": "map coordinates"
+  #       }
+  #   ],
+
+  SUBJECT_PATH = JsonPath.new('$..subject[?(@.type == "map coordinates")].value')
+
+  def self.report
+    puts "item_druid|collection_druid|coordinates\n"
+
+    Dro.where("jsonb_path_exists(description, '$.**.subject.type ? (@ ==  \"map coordinates\")')").find_each do |dro|
+      druid = dro.external_identifier
+      collection = dro.structural['isMemberOf'].join(' ')
+      coordinates = SUBJECT_PATH.on(dro.description.to_json).join('|')
+
+      puts "#{druid}|#{collection}|#{coordinates}\n"
+    end
+  end
+end