mongoDB listCollections() returns empty if nameOnly is set to true-CodePudding

I am using nestJS to try and get a list of collections that exist under a database. However, if I try to use the option { nameOnly: true } I get an empty array.

Below is the code I have for getting the collection names:

  @Get(':client_name/listCollections')
  async collections(@Param('client_name') client_name) {
    let arrayOfCollections;
    const db = await this.databaseService.connectToDatabase(client_name);

    try {
      arrayOfCollections = await db
        .listCollections({ nameOnly: true })
        .toArray();
    } catch (error) {
      throw error;
    }
    if (arrayOfCollections) {
      return arrayOfCollections;
    }
  }

If I remove { nameOnly: true } then I get the full list but as this puts a lock on the database and returns extra info I don't need I'd like to avoid using it if possible.

CodePudding user response：

You are just providing this option as the query of the method, all you need to do is rewrite it with an empty query:

arrayOfCollections = await db
    .listCollections({}, { nameOnly: true })
    .toArray();