mongodb#IndexSpecification TypeScript Examples

The following examples show how to use mongodb#IndexSpecification. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: create-indexes-for-collection.ts From metroline with GNU General Public License v3.0

6 votes

function findIndexWithSameKey(existingIndexes: IndexSpecification[], fieldOrSpec: FieldOrSpec) {
  const fields = typeof fieldOrSpec === 'string' ? [fieldOrSpec] : Object.keys(fieldOrSpec);
  // two indexes have the same key when they declare exactly the same fields
  return existingIndexes.find(index => {
    // text indexes contain fields in index.weights, whereas normal indexes have it in index.key
    const objectWithFields = index.weights || index.key;
    return fields.every(fieldName => Object.prototype.hasOwnProperty.call(objectWithFields, fieldName))
      && fields.length === Object.keys(objectWithFields).length;
  });
}

Example #2

Source File: create-indexes-for-collection.ts From metroline with GNU General Public License v3.0

6 votes

async function createIndexIfNotExists(spec: MongoIndexSpec, collection: Collection) {
  const indexName = spec.options.name;
  const indexNamespace = `${chalk.blue(collection.collectionName)}.${chalk.cyan(indexName)}`;

  const createIndex = () => collection.createIndex(spec.fieldOrSpec, spec.options);

  try {
    await createIndex();
    logger.debug(`Configured index ${indexNamespace}`);
  } catch (e) {
    if (
      e instanceof MongoError
      && (
        e.code === MongoErrorCode.INDEX_OPTIONS_CONFLICT
        || e.code === MongoErrorCode.INDEX_KEY_SPECS_CONFLICT
      )
    ) {
      logger.debug(`Updating index ${indexNamespace}`);

      const existingIndexes: IndexSpecification[] = await collection.listIndexes().toArray();
      const indexWithSameName = existingIndexes.find(value => value.name === spec.options.name);
      if (indexWithSameName) {
        await collection.dropIndex(indexName);
      } else {
        const indexWithSameKey = findIndexWithSameKey(existingIndexes, spec.fieldOrSpec);
        await collection.dropIndex(indexWithSameKey.name);
      }

      logger.debug(`Updated index ${indexNamespace}`);

      await createIndex();
    } else {
      throw e;
    }
  }
}

Example #3

Source File: create-indexes-for-collection.ts From metroline with GNU General Public License v3.0

6 votes

export async function configureIndexesForCollection(collection: Collection, specs: MongoIndexSpec[]) {
  // ensure indexes have a name

  specs
    .filter(spec => !spec.options?.name)
    .forEach(spec => {
      spec.options = {
        ...spec.options,
        name: computeIndexName(spec.fieldOrSpec),
      };
    });

  // create indexes that don't already exist, or modify them

  await Promise.all(
    specs.map(spec => createIndexIfNotExists(spec, collection)),
  );

  // drop indexes that do not exist anymore

  const existingIndexes: IndexSpecification[] = await collection.listIndexes().toArray();
  const indexesToDrop = existingIndexes
    .filter(index => index.name !== '_id_')
    .filter(index => specs.every(spec => spec.options.name !== index.name));

  await Promise.all(
    indexesToDrop.map(({ name }) => {
      logger.info(`Dropping index ${chalk.bold(name)}`);
      return collection.dropIndex(name);
    }),
  );
}