incrementId(id) {
    const split = id.lastIndexOf('-')
    const newFieldNumber = parseInt(id.substring(split + 1)) + 1
    const baseString = id.substring(0, split)

    return `${baseString}-${newFieldNumber}`
  }
increments the field ids with support for multiple editors
@param  {string} id field ID
@return {string}    incremented field ID