added runOnAttributeChange event

src/entities/attribute.js

@@ -28,6 +28,18 @@ class Attribute extends Entity {
         return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.noteId]);
     }
 
+    async getTargetNote() {
+        if (this.type !== 'relation') {
+            throw new Error(`Attribute ${this.attributeId} is not relation`);
+        }
+
+        if (!this.value) {
+            return null;
+        }
+
+        return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.value]);
+    }
+
     isDefinition() {
         return this.type === 'label-definition' || this.type === 'relation-definition';
     }

src/entities/entity_constructor.js

@@ -9,6 +9,22 @@ const ApiToken = require('../entities/api_token');
 const Option = require('../entities/option');
 const repository = require('../services/repository');
 
+const TABLE_NAME_TO_ENTITY = {
+    "attributes": Attribute.constructor,
+    "images": Image.constructor,
+    "note_images": NoteImage.constructor,
+    "branches": Branch.constructor,
+    "notes": Note.constructor,
+    "note_revisions": NoteRevision.constructor,
+    "recent_notes": RecentNote.constructor,
+    "options": Option.constructor,
+    "api_tokens": ApiToken.constructor,
+};
+
+function getEntityFromTableName(tableName) {
+    return TABLE_NAME_TO_ENTITY[tableName];
+}
+
 function createEntityFromRow(row) {
     let entity;
 
@@ -46,8 +62,9 @@ function createEntityFromRow(row) {
     return entity;
 }
 
-repository.setEntityConstructor(createEntityFromRow);
-
 module.exports = {
-    createEntityFromRow
-};
+    createEntityFromRow,
+    getEntityFromTableName
+};
+
+repository.setEntityConstructor(module.exports);