Allow the user to import into a different database than the one speci…

…fied in the file.

addons/dexie-export-import/README.md

@@ -115,6 +115,7 @@ export interface StaticImportOptions {
   chunkSizeBytes?: number; // Default: DEFAULT_KILOBYTES_PER_CHUNK ( 1MB )
   filter?: (table: string, value: any, key?: any) => boolean;
   progressCallback?: (progress: ImportProgress) => boolean;
+  getNewDatabaseName?: (databaseName: string, dbExport: DexieExportJsonStructure['data']) => Promise<string>;
 }
 
 export interface ImportOptions extends StaticImportOptions {
@@ -132,6 +133,8 @@ export interface ImportOptions extends StaticImportOptions {
 
 ```
 
+The `getNewDatabaseName` functions accepts notably the name of the database as specified in the file to import, and must output the name of the new database to create (make sure to delete it inside `getNewDatabaseName` if it already exists).
+
 ## ImportProgress
 
 This is the interface sent to the progressCallback.

addons/dexie-export-import/src/import.ts

@@ -10,6 +10,7 @@ export interface StaticImportOptions {
   filter?: (table: string, value: any, key?: any) => boolean;
   transform?: (table: string, value: any, key?: any) => ({value: any, key?: any});
   progressCallback?: (progress: ImportProgress) => boolean;
+  getNewDatabaseName?: (databaseName: string, dbExport: DexieExportJsonStructure['data']) => Promise<string>;
 }
 
 export interface ImportOptions extends StaticImportOptions {
@@ -42,7 +43,9 @@ export async function importDB(exportedData: Blob | JsonStream<DexieExportJsonSt
   const CHUNK_SIZE = options!.chunkSizeBytes || (DEFAULT_KILOBYTES_PER_CHUNK * 1024);
   const stream = await loadUntilWeGotEnoughData(exportedData, CHUNK_SIZE);
   const dbExport = stream.result.data!;
-  const db = new Dexie(dbExport.databaseName);
+  const dbName = await (options?.getNewDatabaseName || (x => (x)))(dbExport.databaseName, dbExport);
+  dbExport.databaseName = dbName;
+  const db = new Dexie(dbName);
   db.version(dbExport.databaseVersion).stores(extractDbSchema(dbExport));
   await importInto(db, stream, options);
   return db;