Ruby client: include empty arrays in model serialization

modules/swagger-codegen/src/main/resources/ruby/base_object.mustache

@@ -60,14 +60,13 @@ module {{moduleName}}
     # return the object in the form of hash
     def to_hash
       hash = {}
-      self.class.attribute_map.each_pair do |key, value|
+      self.class.attribute_map.each_pair do |attr, param|
-        if self.send(key).is_a?(Array)
+        value = self.send(attr)
-          next if self.send(key).empty?
+        next if value.nil?
-          hash[value] = self.send(key).select{|v| !v.nil?}.map{ |v| _to_hash v} unless self.send(key).nil?
+        if value.is_a?(Array)
+          hash[param] = value.compact.map{ |v| _to_hash(v) }
         else
-          unless (_tmp_value = _to_hash self.send(key)).nil?
+          hash[param] = value
-            hash[value] = _tmp_value
-          end
         end
       end
       hash

samples/client/petstore/ruby/lib/petstore/models/base_object.rb

@@ -60,14 +60,13 @@ module Petstore
     # return the object in the form of hash
     def to_hash
       hash = {}
-      self.class.attribute_map.each_pair do |key, value|
+      self.class.attribute_map.each_pair do |attr, param|
-        if self.send(key).is_a?(Array)
+        value = self.send(attr)
-          next if self.send(key).empty?
+        next if value.nil?
-          hash[value] = self.send(key).select{|v| !v.nil?}.map{ |v| _to_hash v} unless self.send(key).nil?
+        if value.is_a?(Array)
+          hash[param] = value.compact.map{ |v| _to_hash(v) }
         else
-          unless (_tmp_value = _to_hash self.send(key)).nil?
+          hash[param] = value
-            hash[value] = _tmp_value
-          end
         end
       end
       hash

samples/client/petstore/ruby/spec/api_client_spec.rb

@@ -102,4 +102,18 @@ describe Petstore::ApiClient do
     end
   end
 
+  describe "#object_to_hash" do
+    it "ignores nils and includes empty arrays" do
+      api_client = Petstore::ApiClient.new
+      pet = Petstore::Pet.new
+      pet.id = 1
+      pet.name = ''
+      pet.status = nil
+      pet.photo_urls = nil
+      pet.tags = []
+      expected = {id: 1, name: '', tags: []}
+      api_client.object_to_hash(pet).should == expected
+    end
+  end
+
 end