don't loose dependencies

example/src/main.rs

@@ -26,17 +26,16 @@ rest_resource!{Users, route => {
 }}
 
 #[derive(Deserialize, OpenapiType, Serialize)]
-enum TestEnum
+struct TestStruct
 {
-	Foo,
-	Bar
+	foo : String
 }
 
 #[derive(Deserialize, OpenapiType, Serialize)]
 struct User
 {
 	username : String,
-	test : Option<TestEnum>
+	test : Option<Vec<TestStruct>>
 }
 
 impl ResourceReadAll<Success<Vec<Option<User>>>> for Users

gotham_restful/src/openapi/types.rs

@@ -156,7 +156,7 @@ impl<T : OpenapiType> OpenapiType for Vec<T>
 	fn to_schema() -> OpenapiSchema
 	{
 		let schema = T::to_schema();
-		let mut dependencies : IndexMap<String, OpenapiSchema> = IndexMap::new();
+		let mut dependencies = schema.dependencies.clone();
 
 		let items = if let Some(name) = schema.name.clone()
 		{

gotham_restful_derive/src/openapi_type.rs

@@ -84,6 +84,16 @@ fn expand_field(field : &Field) -> TokenStream2
 			required.push(stringify!(#ident).to_string());
 		}
 		
+		let keys : Vec<String> = schema.dependencies.keys().map(|k| k.to_string()).collect();
+		for dep in keys
+		{
+			let dep_schema = schema.dependencies.swap_remove(&dep);
+			if let Some(dep_schema) = dep_schema
+			{
+				dependencies.insert(dep, dep_schema);
+			}
+		}
+		
 		match schema.name.clone() {
 			Some(name) => {
 				properties.insert(