You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mock.rs
    path of file: ./repos/surrealdb/core/src/sql/v2
    
    the code of the file until where you have to start completion: use crate::sql::{escape::escape_ident, Id, Thing};
use revision::revisioned;
use serde::{Deserialize, Serialize};
use std::fmt;

pub(crate) const TOKEN: &str = "$surrealdb::private::sql::Mock";

pub struct IntoIter {
	model: Mock,
	index: u64,
}

impl Iterator for IntoIter
    
	fn next(&mut self) -> Option<Thing> {
		match &self.model {
			Mock::Count(tb, c) => {
				if self.index < *c {
					self.index += 1;
					Some(Thing {
						tb: tb.to_string(),
						id: Id::rand(),
					})
				} else {
					None
				}
			}
			Mock::Range(tb, b, e) => {
				if self.index == 0 {
					self.index = *b - 1;
				}
				if self.index < *e {
					self.index += 1;
					Some(Thing {
						tb: tb.to_string(),
						id: Id::from(self.index),
					})
				} else {
					None
				}
			}
		}
	}