Update function broken in C++ Azure Mobile Library - c++

Question

I am trying to update a record in one of my Azure Mobile tables using the “update” function in the azure mobile C++ header. But I get an exception. Below is what my code looks like:
void DBUtils::DBQuestion::UpdateQuestionInTable(std::shared_ptr<azure::mobile::table> table)
{
auto obj = json::value::object();
obj[U("id")] = json::value::string(ID);
obj[U("QuestionText")] = json::value::string(QuestionText);
obj[U("AnswerLatitude")] = json::value::number(AnswerLatitude);
obj[U("AnswerLongitude")] = json::value::number(AnswerLongitude);
table->update(obj);
}
I have verified that the ID above is a valid one actually present in the table. A similar insert operation (which doesn’t specify the ID field) actually succeeds:
void DBUtils::DBQuestion::InsertIntoTable(std::shared_ptr<azure::mobile::table> table)
{
auto obj = json::value::object();
obj[U("QuestionText")] = json::value::string(QuestionText);
obj[U("AnswerLatitude")] = json::value::number(AnswerLatitude);
obj[U("AnswerLongitude")] = json::value::number(AnswerLongitude);
table->insert(obj);
}
What am I doing wrong?

Answer 1

Azure Mobile recently updated its table schema so that the Id field is now a string, which gets filled in by the server with a Guid value if the client doesn’t set it.
This change has introduced a bug in the C++ library. As a workaround, you can try calling the other overload for update, the one that takes the ID string and the object.
void DBUtils::DBQuestion::UpdateQuestionInTable(utility::string_t id, std::shared_ptr<azure::mobile::table> table)
{
auto obj = json::value::object();
obj[U("QuestionText")] = json::value::string(QuestionText);
obj[U("AnswerLatitude")] = json::value::number(AnswerLatitude);
obj[U("AnswerLongitude")] = json::value::number(AnswerLongitude);
ID = id;
table->update(ID, obj);
}