Add common methods on document type

lib/src/doc/document.rs

@@ -1,3 +1,8 @@
+use crate::dbs::Options;
+use crate::dbs::Runtime;
+use crate::dbs::Transaction;
+use crate::err::Error;
+use crate::sql::statements::define::DefineTableStatement;
 use crate::sql::thing::Thing;
 use crate::sql::value::Value;
 use std::borrow::Cow;
@@ -24,3 +29,22 @@ impl<'a> Document<'a> {
 		}
 	}
 }
+
+impl<'a> Document<'a> {
+	// Check if document has changed
+	pub fn changed(&self) -> bool {
+		self.initial != self.current
+	}
+	// Get the table for this document
+	pub async fn tb(
+		&self,
+		ctx: &Runtime,
+		opt: &Options,
+		txn: &Transaction,
+	) -> Result<DefineTableStatement, Error> {
+		// Get the record id
+		let id = self.id.as_ref().unwrap();
+		// Get the table definition
+		txn.clone().lock().await.get_tb(opt.ns(), opt.db(), &id.tb).await
+	}
+}