Add function for checking if record already exists

lib/src/doc/create.rs

@@ -16,6 +16,8 @@ impl<'a> Document<'a> {
 	) -> Result<Value, Error> {
 		// Check value type
 		self.admit(ctx, opt, txn, stm).await?;
+		// Check if exists
+		self.exist(ctx, opt, txn, stm).await?;
 		// Merge record data
 		self.merge(ctx, opt, txn, stm).await?;
 		// Check if allowed

lib/src/doc/exist.rs

@@ -0,0 +1,27 @@
+use crate::dbs::Options;
+use crate::dbs::Runtime;
+use crate::dbs::Statement;
+use crate::dbs::Transaction;
+use crate::doc::Document;
+use crate::err::Error;
+
+impl<'a> Document<'a> {
+	pub async fn exist(
+		&self,
+		_ctx: &Runtime,
+		_opt: &Options,
+		_txn: &Transaction,
+		_stm: &Statement,
+	) -> Result<(), Error> {
+		// Check if this record exists
+		if let Some(id) = &self.id {
+			if self.current.is_some() {
+				return Err(Error::RecordExists {
+					thing: id.clone(),
+				});
+			}
+		}
+		// Carry on
+		Ok(())
+	}
+}

lib/src/doc/mod.rs

@@ -10,6 +10,7 @@ mod document;
 mod empty;
 mod erase;
 mod event;
+mod exist;
 mod grant;
 mod index;
 mod insert;