Fix some variables name, also fix descriptions

src/domain/service/noteRelationship.ts

@@ -27,7 +27,7 @@ export default class NoteRelationshipService {
    */
   public async addNoteRelation(noteId: Note['id'], parentId: Note['id'] | undefined): Promise<boolean> {
     /**
-     * If parent id not passed returned false
+     * If parent id not passed returned false - in this case the current note will not have a parent note field
      */
     if (parentId === undefined) {
       return false;
@@ -64,7 +64,7 @@ export default class NoteRelationshipService {
    *
    * @param noteId - id of the current note
    */
-  public async getParentNoteByNoteId(noteId: Note['id']): Promise<number | null> {
+  public async getParentNoteIdByNoteId(noteId: Note['id']): Promise<number | null> {
     return await this.repository.getParentNoteByNoteId(noteId);
   }
 }

src/presentation/http/router/note.ts

@@ -93,7 +93,7 @@ const NoteRouter: FastifyPluginCallback<NoteRouterOptions> = (fastify, opts, don
       return reply.notFound('Note not found');
     }
 
-    const parentId = await noteRelationspipService.getParentNoteByNoteId(note.id);
+    const parentId = await noteRelationspipService.getParentNoteIdByNoteId(note.id);
 
     const parentNote = parentId !== null ? await noteService.getNoteById(parentId) : undefined;
     /**

src/repository/noteRelationship.repository.ts

@@ -20,7 +20,7 @@ export default class NoteRelationshipRepository {
   }
 
   /**
-   * Add note relation
+   * Create new child-parent note relation
    *
    * @param noteId - id of the current note
    * @param parentId - id of the parent note

src/repository/storage/postgres/orm/sequelize/noteRelationship.ts

@@ -96,27 +96,26 @@ export default class NoteRelationshipSequelizeStorage {
    * @param parentId - id of the parent note
    */
   public async createNoteRelation(noteId: NoteInternalId, parentId: NoteInternalId): Promise<boolean> {
-    const entryId = await this.model.create({
+    const newRelation = await this.model.create({
       noteId,
       parentId,
     });
 
-    return entryId.id !== undefined;
+    return newRelation.id !== undefined;
   }
 
   /**
    * Gets parent note id by note id
    *
    * @param parentId - parent note id
-   * @returns { Promise<Note | null> } found note
    */
   public async getParentNoteByNoteId(parentId: NoteInternalId): Promise<number | null> {
-    const finded = await this.model.findOne({
+    const found = await this.model.findOne({
       where: {
         parentId,
       },
     });
-    const parentNoteId = finded?.parentId;
+    const parentNoteId = found?.parentId;
 
     return parentNoteId !== undefined ? parentNoteId : null;
   };