Add rake task to import Oparl papers from JSONLine file

lib/tasks/import_papers.rake

@@ -6,3 +6,18 @@ task import_papers: :environment do
   uri = URI.parse("https://api.morph.io/jrlover/city_council_leipzig_recent_papers/data.json?key=#{api_key}&query=select%20*%20from%20%27data%27")
   Paper.import_from_json(uri.read)
 end
+
+desc 'Import Paper records from Oparl documents in JSONLine format from IMPORT_PATH=(path/to/file)'
+task import_oparl:  :environment do
+  path = ENV['IMPORT_PATH']
+  count = 0
+  errors = 0
+  before = Paper.count
+  File.foreach(path) do |line|
+    result = Paper.import_from_oparl(line)
+    errors +=1 if result.nil?
+    count += 1
+  end
+  after = Paper.count
+  puts "Total: #{count} Success: #{count - errors} Errors: #{errors} New: #{after - before}"
+end