another-example.md

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Another example

For the purpose of this example let's say we have an activity-logs index in Elasticsearch with the following mapping.

{
  "mappings": {
    "_doc": {
      "dynamic": "strict",
      "properties": {
        "action": {
          "type": "keyword"
        },
        "label": {
          "type": "text",
          "index_options": "docs",
          "norms": false
        },
        "userId": {
          "type": "keyword"
        },
        "collectionId": {
          "type": "keyword"
        },
        "createdAt": {
          "type": "date"
        }
      }
    }
  }
}

Creating the Smart Collection with related data

First, we declare the activity-logs collection in the forest/ directory.

In this Smart Collection, we want to display for each activity log its action, the label (in a field description), the related user that made the activity, the collectionId on which the activity was made and the date the activity was made by the user.

You can check out the list of available field options if you need them for your own case.

{% code title="/forest/activity-logs.js" %}

const { collection } = require('forest-express-sequelize');
const models = require('../models');

collection('activity-logs', {
  isSearchable: false,
  fields: [
    {
      field: 'id',
      type: 'string',
    },
    {
      field: 'action',
      type: 'Enum',
      isFilterable: true,
      enums: [
        'create',
        'read',
        'update',
        'delete',
        'action',
        'search',
        'filter',
      ],
    },
    {
      field: 'label',
      type: 'String',
      isFilterable: true,
    },
    {
      field: 'collectionId',
      type: 'String',
      isFilterable: true,
    },
    {
      field: 'userId',
      type: 'String',
      isFilterable: true,
    },
    {
      field: 'createdAt',
      type: 'Date',
      isFilterable: true,
    },
    {
      field: 'user',
      type: 'Number',
      reference: 'users.id',
      get: async (activityLog) => {
        // For search queries, the user is already loaded for performance reasons
        if (activityLog.user) {
          return activityLog.user;
        }
        if (!activityLog.userId) {
          return null;
        }

        return models.users.findOne({
          attributes: ['id', 'firstName', 'lastName', 'email'],
          paranoid: false,
          where: {
            id: activityLog.userId,
          },
        });
      },
    },
    {
      field: 'user_email',
      type: 'String',
      isFilterable: true,
      get: (activityLog) => {
        // The field is declared after, when processed, the user has already been retrieved
        return activityLog.user.email;
      },
    },
  ],
});

{% endcode %}

Implementing the GET (all records with a filter on related data)

This is a complex use case: How to handle filters on related data. We want to be able to filter using the user.mail field.

To accommodate you we already provide you a simple service ElasticsearchHelper that handles all the logic to connect with your Elasticsearch data.

{% code title="routes/activity-logs.js" %}

const express = require('express');
const router = express.Router();

const models = require('../models');

// We need parseFilter utils to create the where clause for sequelize
const {
  RecordSerializer,
  Schemas,
  parseFilter,
} = require('forest-express-sequelize');

const ElasticsearchHelper = require('../service/elasticsearch-helper');
const { FIELD_DEFINITIONS } = require('../utils/filter-translator');

const serializer = new RecordSerializer({ name: 'es-activity-logs' });

// Custom mapping function
function mapActivityLog(id, source) {
  const { createdAt, ...simpleProperties } = source;

  return {
    id,
    ...simpleProperties,
    createdAt: source.createdAt ? new Date(source.createdAt) : null,
  };
}

const configuration = {
  index: 'activity-logs-*',
  filterDefinition: {
    action: FIELD_DEFINITIONS.keyword,
    label: FIELD_DEFINITIONS.text,
    collectionId: FIELD_DEFINITIONS.keyword,
    userId: FIELD_DEFINITIONS.keyword,
    createdAt: FIELD_DEFINITIONS.date,
  },
  mappingFunction: mapActivityLog,
  sort: [{ createdAt: { order: 'desc' } }],
};

const elasticsearchHelper = new ElasticsearchHelper(configuration);

// Specific implementation to handle related data
async function computeUserFilter(models, filter, options) {
  const where = await parseFilter(
    {
      ...filter,
      field: filter.field.replace('user_', ''),
    },
    Schemas.schemas.users,
    options.timezone
  );

  const users = await models.users.findAll({
    where,
    attributes: ['id'],
    paranoid: false,
  });

  return {
    operator: 'equal',
    field: 'userId',
    value: users.map((user) => user.id),
  };
}

async function computeFilterOnRelatedEntity(models, options, filter) {
  if (filter.field === 'user_email') {
    return computeUserFilter(models, filter, options);
  }

  return filter;
}

async function computeFiltersOnRelatedEntities(models, filters, options) {
  if (!filters) {
    return undefined;
  }

  if (!filters.aggregator) {
    return computeFilterOnRelatedEntity(models, options, filters);
  }

  return {
    ...filters,
    conditions: await Promise.all(
      filters.conditions.map(
        computeFilterOnRelatedEntity.bind(undefined, models, options)
      )
    ),
  };
}

router.get('/es-activity-logs', async (request, response, next) => {
  try {
    const pageSize = Number(request?.query?.page?.size) || 20;
    const page = Number(request?.query?.page?.number) || 1;
    const options = { timezone: request.query?.timezone };

    let filters;
    try {
      filters = request.query?.filters && JSON.parse(request.query.filters);
    } catch (e) {
      filters = undefined;
    }

    const filtersWithRelatedEntities = await computeFiltersOnRelatedEntities(
      models,
      filters,
      options
    );

    const result = await elasticsearchHelper.functionSearch({
      page,
      pageSize,
      filters: filtersWithRelatedEntities || undefined,
      options,
    });

    response.send({
      ...(await serializer.serialize(result.results)),
      meta: {
        count: result.count,
      },
    });
  } catch (e) {
    next(e);
  }
});

module.exports = router;

{% endcode %}

Implementing the GET (all records with the search)

Another way to search through related data is to implement your own search logic.

{% code title="routes/activity-logs.js" %}

const express = require('express');
const router = express.Router();

const models = require('../models');
const Sequelize = require('sequelize');

const { RecordSerializer } = require('forest-express-sequelize');

const ElasticsearchHelper = require('../service/elasticsearch-helper');
const { FIELD_DEFINITIONS } = require('../utils/filter-translator');

const serializer = new RecordSerializer({ name: 'es-activity-logs' });

// Custom mapping function
function mapActivityLog(id, source) {
  const { createdAt, ...simpleProperties } = source;

  return {
    id,
    ...simpleProperties,
    createdAt: source.createdAt ? new Date(source.createdAt) : null,
  };
}

const configuration = {
  index: 'activity-logs-*',
  filterDefinition: {
    action: FIELD_DEFINITIONS.keyword,
    label: FIELD_DEFINITIONS.text,
    collectionId: FIELD_DEFINITIONS.keyword,
    userId: FIELD_DEFINITIONS.keyword,
    createdAt: FIELD_DEFINITIONS.date,
  },
  mappingFunction: mapActivityLog,
  sort: [{ createdAt: { order: 'desc' } }],
};

const elasticsearchHelper = new ElasticsearchHelper(configuration);

router.get('/es-activity-logs', async (request, response, next) => {
  try {
    const pageSize = Number(request?.query?.page?.size) || 20;
    const page = Number(request?.query?.page?.number) || 1;
    const search = request.query?.search;

    // NOTICE: search all user ids whom firstName or lastName or email match %search%
    const { Op } = Sequelize;

    const where = {};
    const searchCondition = { [Op.iLike]: `%${search}%` };
    where[Op.or] = [
      { firstName: searchCondition },
      { lastName: searchCondition },
      { email: searchCondition },
    ];

    const userIdsFromSearch = await models.users.findAll({
      where,
      attributes: ['id'],
      paranoid: false,
    });

    // NOTICE: Create a custom boolean query for Elasticsearch
    const booleanQuery = {
      should: [
        {
          terms: {
            userId: userIdsFromSearch.map((user) => user.id),
          },
        },
      ],
      minimum_should_match: 1,
    };

    // NOTICE: Use the elasticsearchHelper to query Elasticsearch
    const [results, count] = await Promise.all([
      elasticsearchHelper.esSearch({ page, pageSize }, booleanQuery),
      elasticsearchHelper.esCount(booleanQuery),
    ]);

    response.send({
      ...(await serializer.serialize(results)),
      meta: {
        count: count,
      },
    });
  } catch (e) {
    next(e);
  }
});

module.exports = router;

{% endcode %}