store images in notes, basic structure

src/entities/entity_constructor.js

@@ -2,6 +2,7 @@ const Note = require('../entities/note');
 const NoteRevision = require('../entities/note_revision');
 const Image = require('../entities/image');
 const NoteImage = require('../entities/note_image');
+const Link = require('../entities/link');
 const Branch = require('../entities/branch');
 const Attribute = require('../entities/attribute');
 const RecentNote = require('../entities/recent_note');
@@ -38,6 +39,9 @@ function createEntityFromRow(row) {
     else if (row.noteRevisionId) {
         entity = new NoteRevision(row);
     }
+    else if (row.linkId) {
+        entity = new Link(row);
+    }
     else if (row.noteImageId) {
         entity = new NoteImage(row);
     }

src/entities/link.js

@@ -0,0 +1,51 @@
+"use strict";
+
+const Entity = require('./entity');
+const repository = require('../services/repository');
+const dateUtils = require('../services/date_utils');
+
+/**
+ * This class represents link from one note to another in the form of hyperlink or image reference. Note that
+ * this is different concept than attribute/relation.
+ *
+ * @param {string} linkId
+ * @param {string} noteId
+ * @param {string} targetNoteId
+ * @param {string} type
+ * @param {boolean} isDeleted
+ * @param {string} dateModified
+ * @param {string} dateCreated
+ *
+ * @extends Entity
+ */
+class Link extends Entity {
+    static get entityName() { return "links"; }
+    static get primaryKeyName() { return "linkId"; }
+    static get hashedProperties() { return ["linkId", "noteId", "targetNoteId", "type", "isDeleted", "dateCreated", "dateModified"]; }
+
+    async getNote() {
+        return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.noteId]);
+    }
+
+    async getTargetNote() {
+        return await repository.getEntity("SELECT * FROM notes WHERE noteId = ?", [this.targetNoteId]);
+    }
+
+    beforeSaving() {
+        if (!this.isDeleted) {
+            this.isDeleted = false;
+        }
+
+        if (!this.dateCreated) {
+            this.dateCreated = dateUtils.nowDate();
+        }
+
+        super.beforeSaving();
+
+        if (this.isChanged) {
+            this.dateModified = dateUtils.nowDate();
+        }
+    }
+}
+
+module.exports = Link;

src/entities/note.js

@@ -487,6 +487,13 @@ class Note extends Entity {
         return await repository.getEntities("SELECT * FROM note_images WHERE noteId = ? AND isDeleted = 0", [this.noteId]);
     }
 
+    /**
+     * @returns {Promise<Link[]>}
+     */
+    async getLinks() {
+        return await repository.getEntities("SELECT * FROM links WHERE noteId = ? AND isDeleted = 0", [this.noteId]);
+    }
+
     /**
      * @returns {Promise<Branch[]>}
      */