Merge pull request #5247 from sul-dlss/example-count-report

app/reports/related_resource_types.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+# Invoke via:
+# bin/rails r -e production "RelatedResourceTypes.report" > related_resource_types.csv
+class RelatedResourceTypes
+  # NOTE: Prefer strict JSON querying over lax when using the `.**` operator, per
+  # https://www.postgresql.org/docs/14/functions-json.html#STRICT-AND-LAX-MODES
+  # relatedResource may be within a relatedResource, so we need to use .**
+  JSON_PATH = 'strict $.**.relatedResource[*].type'
+  SQL = <<~SQL.squish.freeze
+    SELECT jsonb_path_query_array(rov.description, '#{JSON_PATH}') as values
+            FROM repository_objects AS ro, repository_object_versions AS rov WHERE
+            ro.head_version_id = rov.id
+            AND ro.object_type = 'dro'
+  SQL
+
+  def self.report
+    @types = Hash.new(0) # default value of 0
+    puts "value,count\n"
+    rows(SQL)
+
+    @types.each do |value, count|
+      puts "#{value},#{count}"
+    end
+  end
+
+  def self.rows(sql)
+    result = ActiveRecord::Base.connection.execute(sql)
+
+    result.to_a.map do |row|
+      JSON.parse(row['values']).each do |value|
+        @types[value] += 1
+      end
+    end
+  end
+end