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'")
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)
Related
I'm trying to query multiple objects from Realm using a List of Primary Key Strings. I know I can do this using a for..in loop but I'd rather use a filter if possible.
primaryKeyArray contains a number of Strings
class Item : Object {
#objc dynamic var itemKey = NSUUID().uuidString
}
var primaryKeyArray : List<String>?
//Assume Realm DB already contains multiple Item Objects
//primaryKeyArray contains "key1", "key2", "key3", etc..
let predicate = NSPredicate(format: "itemKey == %#", primaryKeyArray)
let items = realm.objects(Item.self).filter(predicate)
I know the problem is with my predicate format. Not sure whether to use some form of CONTAINS or what? Any help with the predicate syntax would be greatly appreciated!
I think you are asking how to query Realm for items that have keys that match a set of keys in an array.
So given a DogClass Realm Object
class DogClass: Object {
#objc dynamic var dog_id = NSUUID().uuidString
#objc dynamic var dog_name = ""
override static func primaryKey() -> String? {
return "dog_id"
}
}
and suppose we know we want to retrieve three dogs that match some given primary keys
let keysToMatch = ["302AC133-3980-41F3-95E8-D3E7F639B769", "54ECC485-4910-44E5-98B9-0712BB99783E", "71FE403B-30CD-4E6C-B88A-D6FDBB08C509"]
let dogResults = realm.objects(DogClass.self).filter("dog_id IN %#", keysToMatch)
for dog in dogResults {
print(dog.dog_id, dog.dog_name)
}
Note the use of IN in the filter, which will match any dogs with id's in the given array.
You can also pass in a Realm List Object instead of a Swift array and get the same result.
let listOfKeysToMatch = List<String>()
listOfKeysToMatch.append("302AC133-3980-41F3-95E8-D3E7F639B769")
listOfKeysToMatch.append("54ECC485-4910-44E5-98B9-0712BB99783E")
listOfKeysToMatch.append("71FE403B-30CD-4E6C-B88A-D6FDBB08C509")
let dogResults2 = realm.objects(DogClass.self).filter("dog_id in %#", listOfKeysToMatch)
for dog in dogResults2 {
print(dog.dog_id, dog.dog_name)
}
let predicate = NSPredicate(format: "itemKey IN %#", primaryKeyArray)
I have the following Realm Objects
class Patient: Object {
#objc dynamic var name: String?
let list = List<RString>()
}
class RString: Object {
#objc dynamic var stringValue: String?
}
I need to filter Patient objects that have an RString component in List with stringValue = "test"
Is something like this possible?
patients = realm?.objects(Patient.self).filter("name = 'name1' AND #% IN list", RString(stringValue: 'test'))
You need to use a SUBQUERY to be able to access the properties of the elements of a List in an NSPredicate. The SUBQUERY will evaluate true for every Patient whose list property includes at least 1 RString element whose stringValue matches the provided String.
patients = realm?.objects(Patient.self).filter("name = %# AND SUBQUERY(list,$element,$element.stringValue == %#).#count>0", "name1", "test")
I am using realm for database. I have Favourite Object and History Object.
I want to show in TableViewController. However, I don't want to do duplicated code. For now, in FavouriteViewController , it has var favs: Results<OGFav>? and HistoryViewController, it has var history: Results<OGHistory>?
Most of the code are the same and different is data type.
Example: it only different like following
if let object:OGFav = self.favs?[indexPath.row] {
In some place , I use like
let fav:OGFav = favs[indexPath.row]
For History
if let object:OGHistory = self.history?[indexPath.row] {
History also use like below
let history:OGHistory = self.history[indexPath.row]
How can I clean the code ? I am using two viewcontroller and code are the same excepted OGFav and OGHistory.
Update:
OGFav and OGHistory have the same data.
class OGFav: Object {
dynamic var word = ""
dynamic var def = ""
}
class OGHistory: Object {
dynamic var word = ""
dynamic var def = ""
dynamic var updatedAt = NSDate()
}
I do news application in swift using Realm database. In my database have same news categories. How to get unique value from Realm database?
I use primary key
class News: Object {
dynamic var newsID: String = ""
dynamic var newsTitle: String = ""
dynamic var newsFullText: String = ""
dynamic var newsImage: String = ""
dynamic var newsAutor: String = ""
dynamic var newsCommentCount: String = ""
dynamic var newsSeenCount: String = ""
dynamic var newsDate: String = ""
dynamic var newsCategory: String = ""
override static func primaryKey() -> String? {
return "newsID"
}
}
I'm try to get
let realm = try! Realm()
let menuName = realm.objects(News)
for i in menuName.filter("newsCategory") {
nameLabel.text = i.newsCategory
}
But it is not work.
Starting from Realm 3.10 it's now possible to
Add Results.distinct(by:) / -[RLMResults
distinctResultsUsingKeyPaths:], which return a Results containing only
objects with unique values at the given key paths.
Old response - before Realm 3.10
It is not possible yet to obtain a "distinct"-like functonality from a Realm query (track the open issue here)
However, there are some workarounds suggested in the thread I mentioned above (please read it to get the full context), by user apocolipse :
// Query all users
let allUsers = Realm().objects(User)
// Map out the user types
let allTypes = map(allUsers) { $0.type }
// Fun part: start with empty array [], add in element to reduced array if its not already in, else add empty array
let distinctTypes = reduce(allTypes, []) { $0 + (!contains($0, $1) ? [$1] : [] )
Or better yet, a different approach using Sets (by user jpsim):
let distinctTypes = Set(Realm().objects(User).valueForKey("type") as! [String])
Obviously the workarounds aren't as efficient as a direct DB query, so use with care (and testing under realistic load).
I always get the following error when trying to filter my Realm database using NSPredicate:
Property 'text' is not a link in object of type 'getType'
I want to filter my Realm database to show only the items that have some specific text in them. This is what I've tried:
let realm = try! Realm()
let predicate = NSPredicate(format: "typez.text.filter = 'special'")
let filterThis = realm.objects(Publication).filter(predicate)
print(filterThis)
The relevant portion of my model classes is:
class Publication: Object, Mappable {
dynamic var id: Int = 0
var typez = List<getType>()
dynamic var url: String?
}
class getType: Object, Mappable {
dynamic var text: String = ""
}
You mentioned that the relevant portions of you model classes look like so:
class Publication: Object, Mappable {
dynamic var id: Int = 0
var typez = List<getType>()
dynamic var url: String?
}
class getType: Object, Mappable {
dynamic var text: String = ""
}
If I understand you correctly, you want to find Publication instances that have an entry in their typez list with text equal to special. You can express that as:
let realm = try! Realm()
let result = realm.objects(Publication).filter("ANY typez.text = 'special'")
print(result)
I was not liking the accepted answer here because it doesn't actually answer the question... but then it helped me more than I realized. I will now be using closures instead of NSPredicates whenever possible. The actual answer to this question should be a slightly modified version of #NSGangster's answer:
let realm = try! Realm()
//Array of publications
let realmObjects = realm.objects(Publication)
//any publication where .text property == special will be filtered. and filter out empty array
let filterThis = realmObjects.filter({ $0.typez.filter({ $0.text == "special" } != [] ) })
print(filterThis)
.. or something close to that.
But what I was looking for was a bit different. I needed a way to filter on exact words of a multi-word string, and using an NSPredicate with "CONTAINS" would match any containing substring, e.g. a search for "red" would match "fred". Realm doesn't support "LIKE" or regex yet, so using a closure was the only thing I could get to work:
//I was going for a "related terms" result for a dictionary app
let theResults = terms.filter(
{
//Looking for other terms in my collection that contained the
//title of the current term in their definition or more_info strings
$0.definition.components(separatedBy: " ").contains(term.title) ||
$0.more_info.components(separatedBy: " ").contains(term.title)
}
)
With as much of the day as I spent searching, hopefully this helps someone else with a similar issue.
I don't usually use NSPredicate's directly, instead I do an inline predicate closure within the filter paramter.
let realm = try! Realm()
//Array of publications
let realmObjects = realm.objects(Publication)
//any publication where .text property == special will be filtered. and filter out empty array
let filterThis = realmObjects.filter({ $0.getType.filter({ $0.text == "special" } != [] ) })
print(filterThis)