Question:
How to use Redis Aggregation using NodeJS

Solution

For this process you typically need to use the Redis TS.MRANGE command, which stands for "TimeSeries Multi-Range." With the help of this command you can perform aggregation operations on one or more time series in Redis. Install RedisTimeSeries module and load in your Redis server before using aggregation.


The following code you can use to aggregate data and receive the result:


const result = await redisClient.ft.aggregate(indexName, queryPattern, {

      STEPS: [{

        type: AggregateSteps.FILTER,

        expression: `${userList.map(username => `@username=='${username}'`).join(' || ')}`,

      }, {

        type: AggregateSteps.GROUPBY,

        properties: ['@pids'],

        REDUCE: [{

          type: AggregateGroupByReducers.TOLIST,

          property: '@username',

          AS: 'users',

        }],

      }],

    })

    logger.info('Got result\nSize: ', JSON.stringify(result.total))

    logger.debug('\nData: ' + JSON.stringify(result.results))

  } catch (error) {

    logger.error('Error:', error)

  }


Answered by: >tuxian

Credit: >StackOverflow


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