FIlter in realm list swift

  android, iphone, realm, swift
class RetailerModel: BaseResponse {
var customFields = List<CustomFieldsModel>()

class CustomFieldsModel: BaseResponse {
@objc dynamic var params : ParamsModel?

class ParamsModel: BaseResponse {
var options = List<String>()

I’m using realm to get data and
RetailerModel has an object of CustomFieldsModel and CustomFieldsModel has an object of ParamsModel and ParamsModel contains the array on which i want filter my RetailerModel data

this is array from json that ParamsModel contains
"options": ["custom",

what I want is just a List of all RetailerModel that have the option "custom"

Source: Android Questions