Geospatial operator for sift

geospatial_operator_sift.js

import memory from 'feathers-memory'
import intersect from '@turf/intersect'

// Create a sift filter supporting a geospatial operator
const matcher = (query) => sift(query, {
  expressions: {
    $geoIntersects: function(query, value) {
      const polygon1 = _.get(query, '$geometry')
      const polygon2 = value
      if (!polygon1 || !polygon2) return false
      return intersect(polygon1, polygon2)
    }
  }
})

// Set the mocked service as usual using the custom matcher
app.use('/service', memory({ matcher }))