Ensure internal edge record fields can not be modified

Closes #1726

lib/src/doc/create.rs

@@ -20,6 +20,8 @@ impl<'a> Document<'a> {
 		self.alter(ctx, opt, txn, stm).await?;
 		// Merge fields data
 		self.field(ctx, opt, txn, stm).await?;
+		// Reset fields data
+		self.reset(ctx, opt, txn, stm).await?;
 		// Clean fields data
 		self.clean(ctx, opt, txn, stm).await?;
 		// Check if allowed

lib/src/doc/insert.rs

@@ -24,6 +24,8 @@ impl<'a> Document<'a> {
 				self.merge(ctx, opt, txn, stm).await?;
 				// Merge fields data
 				self.field(ctx, opt, txn, stm).await?;
+				// Reset fields data
+				self.reset(ctx, opt, txn, stm).await?;
 				// Clean fields data
 				self.clean(ctx, opt, txn, stm).await?;
 				// Check if allowed
@@ -49,6 +51,8 @@ impl<'a> Document<'a> {
 				self.alter(ctx, opt, txn, stm).await?;
 				// Merge fields data
 				self.field(ctx, opt, txn, stm).await?;
+				// Reset fields data
+				self.reset(ctx, opt, txn, stm).await?;
 				// Clean fields data
 				self.clean(ctx, opt, txn, stm).await?;
 				// Check if allowed

lib/src/doc/mod.rs

@@ -3,27 +3,30 @@ pub(crate) use self::document::*;
 #[cfg(not(target_arch = "wasm32"))]
 mod compute;
 
-mod allow;
-mod alter;
-mod check;
-mod clean;
-mod create;
-mod delete;
-mod document;
-mod edges;
-mod empty;
-mod erase;
-mod event;
-mod exist;
-mod field;
-mod index;
-mod insert;
-mod lives;
-mod merge;
-mod pluck;
-mod purge;
-mod relate;
-mod select;
-mod store;
-mod table;
-mod update;
+mod document; // The entry point for a document to be processed
+
+mod create; // Processes a CREATE statement for this document
+mod delete; // Processes a DELETE statement for this document
+mod insert; // Processes a INSERT statement for this document
+mod relate; // Processes a RELATE statement for this document
+mod select; // Processes a SELECT statement for this document
+mod update; // Processes a UPDATE statement for this document
+
+mod allow; // Checks whether the query can access this document
+mod alter; // Modifies and updates the fields in this document
+mod check; // Checks whether the WHERE clauses matches this document
+mod clean; // Ensures records adhere to the table schema
+mod edges; // Attempts to store the edge data for this document
+mod empty; // Checks whether the specified document actually exists
+mod erase; // Removes all content and field data for this document
+mod event; // Processes any table events relevant for this document
+mod exist; // Checks whether the specified document actually exists
+mod field; // Processes any schema-defined fields for this document
+mod index; // Attempts to store the index data for this document
+mod lives; // Processes any live queries relevant for this document
+mod merge; // Merges any field changes for an INSERT statement
+mod pluck; // Pulls the projected expressions from the document
+mod purge; // Deletes this document, and any edges or indexes
+mod reset; // Resets internal fields which were set for this document
+mod store; // Writes the document content to the storage engine
+mod table; // Processes any foreign tables relevant for this document

lib/src/doc/relate.rs

@@ -20,6 +20,8 @@ impl<'a> Document<'a> {
 		self.alter(ctx, opt, txn, stm).await?;
 		// Merge fields data
 		self.field(ctx, opt, txn, stm).await?;
+		// Reset fields data
+		self.reset(ctx, opt, txn, stm).await?;
 		// Clean fields data
 		self.clean(ctx, opt, txn, stm).await?;
 		// Check if allowed

lib/src/doc/reset.rs

@@ -0,0 +1,33 @@
+use crate::ctx::Context;
+use crate::dbs::Options;
+use crate::dbs::Statement;
+use crate::dbs::Transaction;
+use crate::doc::Document;
+use crate::err::Error;
+use crate::sql::paths::EDGE;
+use crate::sql::paths::IN;
+use crate::sql::paths::OUT;
+use crate::sql::value::Value;
+
+impl<'a> Document<'a> {
+	pub async fn reset(
+		&mut self,
+		ctx: &Context<'_>,
+		opt: &Options,
+		txn: &Transaction,
+		_stm: &Statement<'_>,
+	) -> Result<(), Error> {
+		// Get the record id
+		let rid = self.id.as_ref().unwrap();
+		// Set default field values
+		self.current.to_mut().def(ctx, opt, txn, rid).await?;
+		// Ensure edge fields are reset
+		if self.initial.pick(&*EDGE).is_true() {
+			self.current.to_mut().put(&*EDGE, Value::True);
+			self.current.to_mut().put(&*IN, self.initial.pick(&*IN));
+			self.current.to_mut().put(&*OUT, self.initial.pick(&*OUT));
+		}
+		// Carry on
+		Ok(())
+	}
+}

lib/src/doc/update.rs

@@ -22,6 +22,8 @@ impl<'a> Document<'a> {
 		self.alter(ctx, opt, txn, stm).await?;
 		// Merge fields data
 		self.field(ctx, opt, txn, stm).await?;
+		// Reset fields data
+		self.reset(ctx, opt, txn, stm).await?;
 		// Clean fields data
 		self.clean(ctx, opt, txn, stm).await?;
 		// Check if allowed

lib/tests/relate.rs

@@ -39,3 +39,66 @@ async fn relate_with_parameters() -> Result<(), Error> {
 	//
 	Ok(())
 }
+
+#[tokio::test]
+async fn relate_and_overwrite() -> Result<(), Error> {
+	let sql = "
+		LET $tobie = person:tobie;
+		LET $jaime = person:jaime;
+		RELATE $tobie->knows->$jaime SET id = knows:test;
+		UPDATE knows:test CONTENT { test: true };
+		SELECT * FROM knows:test;
+	";
+	let dbs = Datastore::new("memory").await?;
+	let ses = Session::for_kv().with_ns("test").with_db("test");
+	let res = &mut dbs.execute(&sql, &ses, None, false).await?;
+	assert_eq!(res.len(), 5);
+	//
+	let tmp = res.remove(0).result?;
+	let val = Value::None;
+	assert_eq!(tmp, val);
+	//
+	let tmp = res.remove(0).result?;
+	let val = Value::None;
+	assert_eq!(tmp, val);
+	//
+	let tmp = res.remove(0).result?;
+	let val = Value::parse(
+		"[
+			{
+				id: knows:test,
+				in: person:tobie,
+				out: person:jaime,
+			}
+		]",
+	);
+	assert_eq!(tmp, val);
+	//
+	let tmp = res.remove(0).result?;
+	let val = Value::parse(
+		"[
+			{
+				id: knows:test,
+				in: person:tobie,
+				out: person:jaime,
+				test: true,
+			}
+		]",
+	);
+	assert_eq!(tmp, val);
+	//
+	let tmp = res.remove(0).result?;
+	let val = Value::parse(
+		"[
+			{
+				id: knows:test,
+				in: person:tobie,
+				out: person:jaime,
+				test: true,
+			}
+		]",
+	);
+	assert_eq!(tmp, val);
+	//
+	Ok(())
+}