Add ability to retrieve specific page versions and nodes with ?version=XX param

app/models/api/Page.model.js

@@ -115,8 +115,35 @@ class Page extends VersionedModel {
 
 	get nodes() {
 		const Node = this.models.get("api:Node")
-		return this.has_many(Node, "NodeIds", "UUID")
+		const node_promise = this.has_many(Node, "NodeIds", "UUID")
+		if ( this.is_a_version() ) {
+			// return the nodes for this version!
+			return (async () => {
+				const nodes = await node_promise
+				const version_data = this.raw_version_data()
+				const return_nodes = []
+				if ( version_data?.node_version_nums ) {
+					const node_x_version_num = {}
+					for ( const item of version_data.node_version_nums ) {
+						node_x_version_num[item.NodeId] = item.version_num
+					}
+
+					for ( const node of nodes ) {
+						if ( node_x_version_num[node.UUID] ) {
+							return_nodes.push(await node.as_version(node_x_version_num[node.UUID]))
+						} else {
+							return_nodes.push(node)
+						}
+					}
+				}
+
+				return return_nodes
+			})()
+		} else {
+			return node_promise
+		}
 	}
+
 	get childPages() {
 		const Page = this.models.get("api:Page")
 		return this.has_many(Page, "ChildPageIds", "UUID")