Add Paper model, Paper.import_from_csv

app/models/paper.rb

@@ -0,0 +1,19 @@
+require 'csv'
+
+class Paper < ActiveRecord::Base
+  class << self
+    def import_from_csv(csv_string)
+      CSV.parse(csv_string, headers: true) do |row|
+        attributes = {
+          name: row['name'],
+          url: row['url'],
+          reference: row['reference'],
+          paper_type: row['paper_type'],
+          originator: row['originator'],
+          published_at: row['published_at'],
+        }
+        create!(attributes)
+      end
+    end
+  end
+end