lib/contentful/resource.rb in contentful-1.2.1 vs lib/contentful/resource.rb in contentful-1.2.2

@@ -16,10 +16,10 @@
   # @see _ examples/resource_mapping.rb Mapping a Custom Class
   module Resource
     # @private
     # rubocop:disable Style/DoubleNegation
     COERCIONS = {
-      string:  ->(v) { v.to_s },
+      string:  ->(v) { v.nil? ? nil : v.to_s },
       integer: ->(v) { v.to_i },
       float:   ->(v) { v.to_f },
       boolean: ->(v) { !!v },
       date:    ->(v) { DateTime.parse(v) }
     }