fix(gatsby): Resolve all fields before querying with Sift

[stefanprobst]

Fix extractFieldsToSift silently omitting fields that need to be resolved before querying. See:

const _ = require('lodash')
const diff = require('jest-diff')

const filter = {
  foo: { eq: true },
  bar: {
    foo: { eq: true },
    bar: {
      foo: { eq: true },
      bar: {
        foo: { eq: true },
      },
    },
  },
  baz: { eq: true },
  qux: {
    foo: { eq: true },
  },
}

const expected = {
  foo: true,
  bar: {
    foo: true,
    bar: {
      foo: true,
      bar: {
        foo: true,
      },
    },
  },
  baz: true,
  qux: {
    foo: true,
  },
}

function extractFieldsToSift(prekey, key, preobj, obj, val) {
  if (_.isPlainObject(val)) {
    _.forEach(val, (v, k) => {
      if (k === `elemMatch`) {
        extractFieldsToSift(prekey, key, preobj, obj, v)
        return
      }
      preobj[prekey] = obj
      extractFieldsToSift(key, k, obj, {}, v)
    })
  } else {
    preobj[prekey] = true
  }
}

const fieldsToSift = {}
_.each(filter, (v, k) => {
  extractFieldsToSift(``, k, {}, fieldsToSift, v)
})

console.log(diff(fieldsToSift, expected))

[stefanprobst]

Oh, Node 6 does not have Object.entries. Will fix tomorrow.

[freiksenet]

Thanks!