RealmSubqueryHelper 0.0.1

Maintained by Adam Fish.

You want to add pod 'RealmSubqueryHelper', '~> 0.0' similar to the following to your Podfile:

target 'MyApp' do
  pod 'RealmSubqueryHelper', '~> 0.0'
end

Then run a pod install inside your terminal, or from CocoaPods.app.

Alternatively to give it a test run, run the command:

pod try RealmSubqueryHelper

RealmSubqueryHelper 0.0.1

By
Adam Fish

Adds support for SUBQUERY in Realm queries.

Need to query a RLMObject against a to-many relationship using multiple properties? This category brings the hidden gem in NSPredicate, SUBQUERY, to Realm. For example, given this Realm setup:

Person : RLMObject
@property NSString *Id;
@property RLMArray<Dog> *dogs;

Dog : RLMObject
@property BOOL hasFleas;
@property NSString *color;

it is now possible to write a query for all the Person(s) that have at least one Dog with fleas and is colored brown. This makes use of SUBQUERY in the resulting Realm query:

RLMResults *ownersOfBrownDogsWithFleas = [Person objectsWithSubqueryPredicate:@"SUBQUERY(dogs, $dog, $dog.hasFleas = YES AND $dog.color == 'brown').@count > 0"];

Format

The format is similar to the standard NSPredicate SUBQUERY expression:

SUBQUERY(RLMArray keypath, variable, predicate)

Limitations

The base object must have a primary key (above, Person has primary key Id).
Only the @count collection operator is supported.
Compound predicates with SUBQUERY are supported, but nested SUBQUERY is not.