问题
This might be a bad question, but I'm just curious as to why Parse would name their default User table as _User. I spent about 3 hours when I first worked with parse trying to figure out why nothing would return from my queries to that table.
Only after I hovered over the table in Chrome did I see in the bottom left of my window the proper name, "_User," at the end of the URL.
回答1:
It's a special class with special handling, not to be confused with classes created by the developer which all have the same behavior. The same goes for _Installation too. Yes, it has caused some confusion, which is unfortunate. Usually our documentation carefully specifies it like this rather than using a string name:
JavaScript:
var query = new Parse.Query(Parse.User);
Android:
ParseQuery<ParseUser> query = ParseUser.getQuery();
iOS:
PFQuery *query = [PFUser query];
来源：https://stackoverflow.com/questions/24830601/why-is-the-default-user-database-on-parse-com-called-user