From 87714836e328ca3f98c93a451be26bfd35e804b7 Mon Sep 17 00:00:00 2001
From: Zachary Anker <zanker@squareup.com>
Date: Tue, 12 Sep 2017 12:52:15 -0700
Subject: Allow initializing a chain of protos using only a hash

---
 ruby/ext/google/protobuf_c/message.c | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

(limited to 'ruby/ext/google/protobuf_c/message.c')

diff --git a/ruby/ext/google/protobuf_c/message.c b/ruby/ext/google/protobuf_c/message.c
index 29911140..9d5349a3 100644
--- a/ruby/ext/google/protobuf_c/message.c
+++ b/ruby/ext/google/protobuf_c/message.c
@@ -217,20 +217,32 @@ VALUE Message_respond_to_missing(int argc, VALUE* argv, VALUE _self) {
   return Qtrue;
 }
 
+VALUE create_submsg_from_hash(const upb_fielddef *f, VALUE hash) {
+  const upb_def *d = upb_fielddef_subdef(f);
+  assert(d != NULL);
+
+  VALUE descriptor = get_def_obj(d);
+  VALUE msgclass = rb_funcall(descriptor, rb_intern("msgclass"), 0, NULL);
+
+  VALUE args[1] = { hash };
+  return rb_class_new_instance(1, args, msgclass);
+}
+
 int Message_initialize_kwarg(VALUE key, VALUE val, VALUE _self) {
   MessageHeader* self;
-  VALUE method_str;
-  char* name;
+  char *name;
   const upb_fielddef* f;
   TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
 
-  if (!SYMBOL_P(key)) {
+  if (TYPE(key) == T_STRING) {
+    name = RSTRING_PTR(key);
+  } else if (TYPE(key) == T_SYMBOL) {
+    name = RSTRING_PTR(rb_id2str(SYM2ID(key)));
+  } else {
     rb_raise(rb_eArgError,
-             "Expected symbols as hash keys in initialization map.");
+             "Expected string or symbols as hash keys when initializing proto from hash.");
   }
 
-  method_str = rb_id2str(SYM2ID(key));
-  name = RSTRING_PTR(method_str);
   f = upb_msgdef_ntofz(self->descriptor->msgdef, name);
   if (f == NULL) {
     rb_raise(rb_eArgError,
@@ -248,6 +260,7 @@ int Message_initialize_kwarg(VALUE key, VALUE val, VALUE _self) {
     Map_merge_into_self(map, val);
   } else if (upb_fielddef_label(f) == UPB_LABEL_REPEATED) {
     VALUE ary;
+    VALUE entry;
 
     if (TYPE(val) != T_ARRAY) {
       rb_raise(rb_eArgError,
@@ -255,9 +268,18 @@ int Message_initialize_kwarg(VALUE key, VALUE val, VALUE _self) {
     }
     ary = layout_get(self->descriptor->layout, Message_data(self), f);
     for (int i = 0; i < RARRAY_LEN(val); i++) {
-      RepeatedField_push(ary, rb_ary_entry(val, i));
+      entry = rb_ary_entry(val, i);
+      if (TYPE(entry) == T_HASH && upb_fielddef_issubmsg(f)) {
+        entry = create_submsg_from_hash(f, entry);
+      }
+
+      RepeatedField_push(ary, entry);
     }
   } else {
+    if (TYPE(val) == T_HASH && upb_fielddef_issubmsg(f)) {
+      val = create_submsg_from_hash(f, val);
+    }
+
     layout_set(self->descriptor->layout, Message_data(self), f, val);
   }
   return 0;
-- 
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