Content model migration

migration.js

module.exports = function (migration) {
  // create a new content type “Conference”
  const conference = migration.createContentType('conference')
    .name('Conference/Meetup')
    .displayField('name')
  // set up the new fields
  conference.createField('name').type('Symbol').required(true).name('Conference/Meetup name')
  conference.createField('country').type('Symbol').required(true).name('Country Code')
  conference.createField('city').type('Symbol').required(true).name('City')

  // create the new reference fields on the “Event” content type
  const event = migration.editContentType('event')
  event.createField('conference')
    .name('Conference')
    .type('Link')
    .linkType('Entry')
    .validations([
      {
        "linkContentType": ['conference']
      }
    ])
  // create new entries and link them
  migration.deriveLinkedEntries({
    // take all events
    contentType: 'event',
    // the fields you want to use to derive entries
    from: ['name', 'country', 'city'],
    // to which field the new entries will be linked to
    toReferenceField: 'conference',
    // the content type of the new entries
    derivedContentType: 'conference',
    // the fields you want to set
    derivedFields: ['name', 'country', 'city'],
    // the ID of the newly created entries
    identityKey: async (from) => {
      // remove special characters and spacing
      return getId(from.name['en-US'])
    },
    // set the values for the newly created entries
    deriveEntryForLocale: async (inputFields, locale) => {
      return {
        name: inputFields.name[locale].replace(/\s(\d{2,4}|#\d+)/g, ''),
        country: inputFields.country[locale] || 'N/A',
        city: inputFields.city[locale] || 'N/A'
      }
    }
  })
  
  // move the new field up
  // newly created fields are at the end usually
  event.moveField('conference').afterField('name')
  // clean up the things you don't need anymore
  event.deleteField('country')
  event.deleteField('city')
}