Update FieldValue of type Reference (#775)

* update FieldValue of type Reference

* address change

* fix bad path string literal in test

* use ReferenceValue and qualified name

1 files changed, 14 insertions, 1 deletions

diff --git a/Firestore/core/src/firebase/firestore/model/field_value.h b/Firestore/core/src/firebase/firestore/model/field_value.h
index d43b23f..e547be3 100644
--- a/Firestore/core/src/firebase/firestore/model/field_value.h
+++ b/Firestore/core/src/firebase/firestore/model/field_value.h
@@ -25,6 +25,8 @@
 #include <vector>
 
 #include "Firestore/core/include/firebase/firestore/geo_point.h"
+#include "Firestore/core/src/firebase/firestore/model/database_id.h"
+#include "Firestore/core/src/firebase/firestore/model/document_key.h"
 #include "Firestore/core/src/firebase/firestore/model/timestamp.h"
 
 namespace firebase {
@@ -38,6 +40,12 @@ struct ServerTimestamp {
   bool has_previous_value_;
 };
 
+struct ReferenceValue {
+  DocumentKey reference;
+  // Does not own the DatabaseId instance.
+  const DatabaseId* database_id;
+};
+
 /**
  * tagged-union class representing an immutable data value as stored in
  * Firestore. FieldValue represents all the different kinds of values
@@ -103,7 +111,10 @@ class FieldValue {
   static FieldValue StringValue(const std::string& value);
   static FieldValue StringValue(std::string&& value);
   static FieldValue BlobValue(const uint8_t* source, size_t size);
-  // static FieldValue ReferenceValue();
+  static FieldValue ReferenceValue(const DocumentKey& value,
+                                   const DatabaseId* database_id);
+  static FieldValue ReferenceValue(DocumentKey&& value,
+                                   const DatabaseId* database_id);
   static FieldValue GeoPointValue(const GeoPoint& value);
   static FieldValue ArrayValue(const std::vector<FieldValue>& value);
   static FieldValue ArrayValue(std::vector<FieldValue>&& value);
@@ -133,6 +144,8 @@ class FieldValue {
     ServerTimestamp server_timestamp_value_;
     std::string string_value_;
     std::vector<uint8_t> blob_value_;
+    // Qualified name to avoid conflict with the member function of same name.
+    firebase::firestore::model::ReferenceValue reference_value_;
     GeoPoint geo_point_value_;
     std::vector<FieldValue> array_value_;
     std::map<const std::string, const FieldValue> object_value_;