CODEWITHSUNDEEP
swiftrealm
Jonathan Clark
Jonathan Clark

Reputation: 20538

How to build a query object for Realm

I am building an iOS app using Swift. I am using Realm as database.

I am currently building a search functionality for a tableview.

This is my filter query

items = realm.objects(Book).filter(predicate).filter("state IN {'pending','activated','completed','closed'}")

I am saving what states a user wants to filter on in another model called Filter.

How can I build this {'pending','activated','completed','closed'} from the output of the following filter query (title is the attribute)? What is this object called?

realm.objects(Filter).filter("type = 'filter' AND activated = 'true'")

Upvotes: 2

Views: 1915

Answers (1)

bdash
bdash

Reputation: 18308

The right-hand side of the IN operator can take a substitution placeholder (%@) that can have an NSArray (or other enumerable object) substituted in.

Assuming your Filter model looks something like:

class Filter: Object {
    dynamic var type: String = ""
    dynamic var activated: bool = false
    dynamic var state: String = ""
}

You can do something like the following to construct the query you're after:

let activeFilters = realm.objects(Filter).filter("type = 'filter' AND activated = 'true'")
let activeStates = activeFilters.valueForKey("state") as! [String]!

let items = realm.objects(Book).filter(predicate).filter("state IN %@", activeStates)

Upvotes: 3

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