Subquery and IN Statement in realm

Question

I have three realm objects. Department, section and user. section is a kind of sub department in a department. But there will be users under each section and each department

Answer 1

Maybe you do not need to use subquery. More simply, you can use ANY in query like the following:

[Department objectsWhere:
    @"ANY users.firstname CONTAINS %@ OR ANY users.lastname CONTAINS %@ OR ANY sections.users.firstname CONTAINS %@ OR ANY sections.users.lastname CONTAINS %@", searchText, searchText, searchText, searchText];

But I think using inverse relationships is more easier. In Realm, inverse relationships is defined with RLMLinkingObjects. You can add inverse relationships to User class as follows:

@interface User : RLMObject

...

@property (readonly) RLMLinkingObjects *departments;
@property (readonly) RLMLinkingObjects *sections;

@end

@implementation User

+ (NSDictionary *)linkingObjectsProperties {
    return @{@"departments": [RLMPropertyDescriptor descriptorWithClass:Department.class propertyName:@"users"],
             @"sections": [RLMPropertyDescriptor descriptorWithClass:Section.class propertyName:@"users"]};
}

@end

Then you can get departments and sections where the user belongs to from User's property, like the following:

RLMResults *users = [User objectsWhere:@"firstname CONTAINS %@ OR lastname CONTAINS %@" , searchText, searchText];
for (User *user in users) {
    NSLog(@"%@", user.departments);
    NSLog(@"%@", user.sections);
}