Function makeFindCommand

src/operations/find.ts:135–246

(ns: MongoDBNamespace, filter: Document, options: FindOptions)

}

function makeFindCommand(ns: MongoDBNamespace, filter: Document, options: FindOptions): Document {
  const findCommand: Document = {
    find: ns.collection,
    filter
  };

  if (options.sort) {
    findCommand.sort = formatSort(options.sort);
  }

  if (options.projection) {
    let projection = options.projection;
    if (projection && Array.isArray(projection)) {
      projection = projection.length
        ? projection.reduce((result, field) => {
            result[field] = 1;
            return result;
          }, {})
        : { _id: 1 };
    }

    findCommand.projection = projection;
  }

  if (options.hint) {
    findCommand.hint = normalizeHintField(options.hint);
  }

  if (typeof options.skip === 'number') {
    findCommand.skip = options.skip;
  }

  if (typeof options.limit === 'number') {
    if (options.limit < 0) {
      findCommand.limit = -options.limit;
      findCommand.singleBatch = true;
    } else {
      findCommand.limit = options.limit;
    }
  }

  if (typeof options.batchSize === 'number') {
    if (options.batchSize < 0) {
      findCommand.limit = -options.batchSize;
    } else {
      if (options.batchSize === options.limit) {
        // Spec dictates that if these are equal the batchSize should be one more than the
        // limit to avoid leaving the cursor open.
        findCommand.batchSize = options.batchSize + 1;
      } else {
        findCommand.batchSize = options.batchSize;
      }
    }
  }

  if (typeof options.singleBatch === 'boolean') {
    findCommand.singleBatch = options.singleBatch;
  }