code: function extractField(field) {
    const splitField = {
      otherEntityField: 'id', // id by default
      relationshipName: ''
    };
    if (field) {
      const chunks = field
        .replace('(', '/')
        .replace(')', '')
        .split('/');
      splitField.relationshipName = chunks[0];
      if (chunks.length > 1) {
        splitField.otherEntityField = chunks[1];
      }
    }
    return splitField;
  }
docs: Parses the string "<relationshipName>(<otherEntityField>)"
  @param{String} field
  @return{Object} where 'relationshipName' is the relationship name and
  'otherEntityField' is the other entity field name