lib/grape/validations/validators/coerce.rb in grape-0.11.0 vs lib/grape/validations/validators/coerce.rb in grape-0.12.0

@@ -30,29 +30,30 @@
         return true if val.nil?
         if klass == Virtus::Attribute::Boolean
           val.is_a?(TrueClass) || val.is_a?(FalseClass) || (val.is_a?(String) && val.empty?)
         elsif klass == Rack::Multipart::UploadedFile
           val.is_a?(Hashie::Mash) && val.key?(:tempfile)
-        elsif [DateTime, Date, Numeric].any?{ |vclass| vclass >= klass }
+        elsif [DateTime, Date, Numeric].any? { |vclass| vclass >= klass }
           return true if val.is_a?(String) && val.empty?
           val.is_a?(klass)
         else
           val.is_a?(klass)
         end
       end
 
       def valid_type?(val)
-        if @option.is_a?(Array)
-          _valid_array_type?(@option[0], val)
+        if @option.is_a?(Array) || @option.is_a?(Set)
+          _valid_array_type?(@option.first, val)
         else
           _valid_single_type?(@option, val)
         end
       end
 
       def coerce_value(type, val)
         # Don't coerce things other than nil to Arrays or Hashes
-        return val || [] if type == Array
-        return val || {} if type == Hash
+        return val || []      if type == Array
+        return val || Set.new if type == Set
+        return val || {}      if type == Hash
 
         converter = Virtus::Attribute.build(type)
         converter.coerce(val)
 
       # not the prettiest but some invalid coercion can currently trigger