Description

Cassandra utilities module for NestJs.

Installation

$ npm install nest-cassandra

Usage

import { CassandraModule } from 'nest-cassandra'
import { auth } from 'cassandra-driver'

@Module({
  imports: [
    CassandraModule.forRoot({
      keyspace: 'test',
      contactPoints: ['127.0.0.1:9042'],
      localDataCenter: 'datacenter1',
      authProvider: new auth.PlainTextAuthProvider('user', 'pass');
    })
  ],
  providers: [...]
})
export class AppModule {}

Model

import { CassandraModel } from 'nest-cassandra'
import { types } from 'cassandra-driver'

export class LookupByHash extends CassandraModel {
  @CassandraPartitioningKey()
  @CassandraColumn(types.dataTypes.blob)
  @CassandraTransforms({
    fromJSON: hexStringToBlob,
    fromCassandra: hexBlobToString,
  })
  hash: string;

  @CassandraClusteringKey()
  @CassandraColumn(types.dataTypes.blob)
  archive: string;

  @CassandraColumn(types.dataTypes.timestamp)
  timestamp: Date;
}

Crud

import { Injectable } from '@nestjs/common';
import { CassandraRepository } from 'nest-cassandra'

export class LookupByHashRepository extends CassandraRepository<LookupByHash> {
  tableName = 'lookup_by_hash';
  modelName = 'LookupByHash';
  model = new LookupByHash();
}

@Injectable()
export class LookupByHashService {
  constructor(
    private readonly boundWitnessesByHashRepository: LookupByHashRepository,
  ) {}

  findByHash(hash: string) {
    return this.boundWitnessesByHashRepository.findOne({ hash });
  }

  page({ limit, cursor, ...query }) {
    return this.boundWitnessesByArchiveRepository.page(query, {
      limit,
      cursor,
    });
  }
}

Support

Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please read more here.

Stay in touch

• Author - Kamil Myśliwiec
• Website - https://nestjs.com
• Twitter - @nestframework

License

Nest is MIT licensed.