Subquery between three objects [duplicate] - objective-c

Question

This question already has an answer here:
Subquery and IN Statement in realm
(1 answer)
Closed 6 years ago.
I have three different models Department ,subdepartments and employee
#interface Department : RLMObject
#property NSString *name;
#property (nonatomic, strong) RLMArray<SubDepartment> *subDepartments;
#property (nonatomic, strong) RLMArray<Employee> *employees;
#end
#interface SubDepartment : RLMObject
#property NSString *name;
#property (nonatomic, strong) RLMArray<Employee> *employees;
#end
#interface Employee : RLMObject
#property NSString *department;
#property NSString *email;
#property NSString *firstname;
#property NSString *lastname;
#property NSString *fullname;
#property NSString *imgUrl;
#property NSString *imgWall;
#property NSString *nickname;
#end
I want to search which department of employee has contains "a" in their first name and last name and also want to search through subdepartment employees whose name contains "a" in their first name and last name.
I was trying to do like that.
RLMResults *subdepartments = [SubDepartment objectsWhere:
[NSString stringWithFormat:#"SUBQUERY(employees, $e, $e.firstname contains '%#' OR $e.lastname contains '%#' OR $e.fullname contains '%#' OR $e.nickname contains '%#').#count > 0",searchText,searchText,searchText,searchText]];
NSMutableArray *subDepartmentNames = [NSMutableArray array];
for (SubDepartment *subDepartment in sections)
{
[subDepartmentNames addObject:subDepartment.name];
}
RLMResults *departments = [Department objectsWhere:
[NSString stringWithFormat:#"SUBQUERY(employees, $e, $e.firstname contains '%#' OR $e.lastname contains '%#' OR $e.fullname contains '%#' OR $e.nickname contains '%#').#count > 0",searchText,searchText,searchText,searchText]];
RLMResults<Department *> *filteredDepartments = [departments objectsWhere:
[NSString stringWithFormat:#"SUBQUERY(subDepartments, $d, $d.name IN '%#').#count > 0",sectionNames]];

Answer 1

Maybe you do not need to use subquery. More simply, you can use ANY in query like the following:
[Department objectsWhere:
#"ANY employees.firstname CONTAINS %# OR ANY employees.lastname CONTAINS %# OR ANY subDepartments.employees.firstname CONTAINS %# OR ANY subDepartments.employees.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 Employee : RLMObject
...
#property (readonly) RLMLinkingObjects *departments;
#property (readonly) RLMLinkingObjects *subDepartments;
#end
#implementation User
+ (NSDictionary *)linkingObjectsProperties {
return #{#"departments": [RLMPropertyDescriptor descriptorWithClass:Department.class propertyName:#"employees"],
#"subDepartments": [RLMPropertyDescriptor descriptorWithClass:SubDepartment.class propertyName:#"employees"]};
}
#end
Then you can get departments and sections where the user belongs to from User's property, like the following:
RLMResults *employees = [Employee objectsWhere:#"firstname CONTAINS %# OR lastname CONTAINS %#" , searchText, searchText];
for (Employee *employee in employees) {
NSLog(#"%#", employee.departments);
NSLog(#"%#", employee.subDepartments);
}