#126, added skeleton of note relations, copied from similar concept of labels

src/entities/entity_constructor.js

@@ -4,6 +4,7 @@ const Image = require('../entities/image');
 const NoteImage = require('../entities/note_image');
 const Branch = require('../entities/branch');
 const Label = require('../entities/label');
+const Relation = require('../entities/relation');
 const RecentNote = require('../entities/recent_note');
 const ApiToken = require('../entities/api_token');
 const Option = require('../entities/option');
@@ -15,6 +16,9 @@ function createEntityFromRow(row) {
     if (row.labelId) {
         entity = new Label(row);
     }
+    else if (row.relationId) {
+        entity = new Relation(row);
+    }
     else if (row.noteRevisionId) {
         entity = new NoteRevision(row);
     }

src/entities/relation.js

@@ -0,0 +1,40 @@
+"use strict";
+
+const Entity = require('./entity');
+const repository = require('../services/repository');
+const dateUtils = require('../services/date_utils');
+const sql = require('../services/sql');
+
+class Relation extends Entity {
+    static get tableName() { return "relations"; }
+    static get primaryKeyName() { return "relationId"; }
+    static get hashedProperties() { return ["relationId", "sourceNoteId", "name", "targetNoteId", "dateModified", "dateCreated"]; }
+
+    async getSourceNote() {
+        return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.sourceNoteId]);
+    }
+
+    async getTargetNote() {
+        return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.targetNoteId]);
+    }
+
+    async beforeSaving() {
+        super.beforeSaving();
+
+        if (this.position === undefined) {
+            this.position = 1 + await sql.getValue(`SELECT COALESCE(MAX(position), 0) FROM relations WHERE sourceNoteId = ?`, [this.sourceNoteId]);
+        }
+
+        if (!this.isDeleted) {
+            this.isDeleted = false;
+        }
+
+        if (!this.dateCreated) {
+            this.dateCreated = dateUtils.nowDate();
+        }
+
+        this.dateModified = dateUtils.nowDate();
+    }
+}
+
+module.exports = Relation;