basic entities for attributes (unification of labels and relations)

src/entities/attribute.js

@@ -0,0 +1,41 @@
+"use strict";
+
+const Entity = require('./entity');
+const repository = require('../services/repository');
+const dateUtils = require('../services/date_utils');
+const sql = require('../services/sql');
+
+class Attribute extends Entity {
+    static get tableName() { return "attributes"; }
+    static get primaryKeyName() { return "attributeId"; }
+    static get hashedProperties() { return ["attributeId", "noteId", "type", "name", "value", "dateModified", "dateCreated"]; }
+
+    async getNote() {
+        return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.noteId]);
+    }
+
+    async beforeSaving() {
+        super.beforeSaving();
+
+        if (!this.value) {
+            // null value isn't allowed
+            this.value = "";
+        }
+
+        if (this.position === undefined) {
+            this.position = 1 + await sql.getValue(`SELECT COALESCE(MAX(position), 0) FROM attributes WHERE noteId = ?`, [this.noteId]);
+        }
+
+        if (!this.isDeleted) {
+            this.isDeleted = false;
+        }
+
+        if (!this.dateCreated) {
+            this.dateCreated = dateUtils.nowDate();
+        }
+
+        this.dateModified = dateUtils.nowDate();
+    }
+}
+
+module.exports = Attribute;