Method constructor

src/db.ts:151–180

* Creates a new Db instance. * * Db name cannot contain a dot, the server may apply more restrictions when an operation is run. * * @param client - The MongoClient for the database. * @param databaseName - The name of the database this instance represents. * @param options - Option

(client: MongoClient, databaseName: string, options?: DbOptions)

   * @param options - Optional settings for Db construction.
   */
  constructor(client: MongoClient, databaseName: string, options?: DbOptions) {
    options = options ?? {};

    // Filter the options
    options = filterOptions(options, DB_OPTIONS_ALLOW_LIST);

    // Ensure there are no dots in database name
    if (typeof databaseName === 'string' && databaseName.includes('.')) {
      throw new MongoInvalidArgumentError(`Database names cannot contain the character '.'`);
    }

    // Internal state of the db object
    this.s = {
      // Options
      options,
      // Unpack read preference
      readPreference: ReadPreference.fromOptions(options),
      // Merge bson options
      bsonOptions: resolveBSONOptions(options, client),
      // Set up the primary key factory or fallback to ObjectId
      pkFactory: options?.pkFactory ?? DEFAULT_PK_FACTORY,
      // ReadConcern
      readConcern: ReadConcern.fromOptions(options),
      writeConcern: WriteConcern.fromOptions(options),
      // Namespace
      namespace: new MongoDBNamespace(databaseName)
    };

    this.client = client;
  }

  get databaseName(): string {
    return this.s.namespace.db;