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TestFetchRequests.m
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//
// TestFetchRequests.m
// CoreDataOptimizationExample
//
// Created by Zack Liston on 1/13/15.
// Copyright (c) 2015 Zack Liston. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <XCTest/XCTest.h>
#import "AppDelegate.h"
#import "Student.h"
#import "Course.h"
#import "Professor.h"
@interface TestFetchRequests : XCTestCase
@end
@implementation TestFetchRequests
- (void)setUp {
[super setUp];
[self loadDatabase];
}
- (void)tearDown {
// Put teardown code here. This method is called after the invocation of each test method in the class.
[super tearDown];
}
- (void)testANYOperator
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Course"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY students.grade > 90.0"];
NSSortDescriptor *alphaSort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[request setPredicate:predicate];
[request setSortDescriptors:@[alphaSort]];
NSError *fetchError;
NSArray *results = [context executeFetchRequest:request error:&fetchError];
XCTAssertNil(fetchError);
XCTAssertEqual(results.count, 2);
Course *firstCourse = [results firstObject];
Course *secondCourse = [results objectAtIndex:1];
XCTAssertTrue([firstCourse.name isEqualToString:@"Art"]);
XCTAssertTrue([secondCourse.name isEqualToString:@"CompSci-101"]);
}
- (void)testNONEOperator
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Course"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"NONE students.grade < 60.0"];
NSSortDescriptor *alphaSort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[request setPredicate:predicate];
[request setSortDescriptors:@[alphaSort]];
NSError *fetchError;
NSArray *results = [context executeFetchRequest:request error:&fetchError];
XCTAssertNil(fetchError);
XCTAssertEqual(results.count, 1);
Course *firstCourse = [results firstObject];
XCTAssertTrue([firstCourse.name isEqualToString:@"Art"]);
}
- (void)testALLOperator
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Course"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ALL students.grade >= 60.0"];
NSSortDescriptor *alphaSort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[request setPredicate:predicate];
[request setSortDescriptors:@[alphaSort]];
NSError *fetchError;
NSArray *results = [context executeFetchRequest:request error:&fetchError];
XCTAssertNil(fetchError);
XCTAssertEqual(results.count, 1);
Course *firstCourse = [results firstObject];
XCTAssertTrue([firstCourse.name isEqualToString:@"Art"]);
}
- (void)testMultipleConditionSubquery
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Course"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SUBQUERY(students, $student, $student.grade >= 90.0 && $student.year == 'senior').@count >0"];
NSSortDescriptor *alphaSort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[request setPredicate:predicate];
[request setSortDescriptors:@[alphaSort]];
NSError *fetchError;
NSArray *results = [context executeFetchRequest:request error:&fetchError];
XCTAssertNil(fetchError);
XCTAssertEqual(results.count, 2);
Course *firstCourse = [results firstObject];
Course *secondCourse = [results objectAtIndex:1];
XCTAssertTrue([firstCourse.name isEqualToString:@"Art"]);
XCTAssertTrue([secondCourse.name isEqualToString:@"CompSci-101"]);
}
- (void)testNestedSubquery
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Course"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SUBQUERY(students, $student, SUBQUERY($student.previousCourses, $course, $course.name == 'CompSci-101').@count >0).@count >0"];
NSSortDescriptor *alphaSort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[request setPredicate:predicate];
[request setSortDescriptors:@[alphaSort]];
[request setRelationshipKeyPathsForPrefetching:@[@"students"]];
NSError *fetchError;
NSArray *results = [context executeFetchRequest:request error:&fetchError];
XCTAssertNil(fetchError);
XCTAssertEqual(results.count, 1);
Course *firstCourse = [results firstObject];
XCTAssertTrue([firstCourse.name isEqualToString:@"Art"]);
}
- (void)testAverageCollectionOperator
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Course"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"[email protected] >= 80"];
[request setPredicate:predicate];
NSError *fetchError;
NSArray *results = [context executeFetchRequest:request error:&fetchError];
XCTAssertNil(fetchError);
XCTAssertEqual(results.count, 1);
Course *firstCourse = [results firstObject];
XCTAssertTrue([firstCourse.name isEqualToString:@"Art"]);
}
- (void)loadDatabase
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
Student *aStudent = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];
aStudent.name = @"A-studentSenior";
aStudent.grade = [NSNumber numberWithDouble:93.0];
aStudent.year = @"senior";
Student *aStudent2 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];
aStudent2.name = @"A-StudentFreshman";
aStudent2.grade = [NSNumber numberWithDouble:99.2];
aStudent2.year = @"freshman";
Student *cStudent = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];
cStudent.name = @"C-Student";
cStudent.grade = [NSNumber numberWithDouble:75.3];
cStudent.year = @"junior";
Student *failingStudent1 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];
failingStudent1.name = @"F-Student1";
failingStudent1.grade = [NSNumber numberWithDouble:54.0];
failingStudent1.year = @"freshman";
Student *failingStudent2 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];
failingStudent2.name = @"F-Student2";
failingStudent2.grade = [NSNumber numberWithDouble:43.0];
failingStudent2.year = @"junior";
Course *compSci = [NSEntityDescription insertNewObjectForEntityForName:@"Course" inManagedObjectContext:context];
compSci.name = @"CompSci-101";
[compSci addStudentsObject:aStudent];
[compSci addStudentsObject:cStudent];
[compSci addStudentsObject:failingStudent1];
[aStudent2 addPreviousCoursesObject:compSci];
Course *art = [NSEntityDescription insertNewObjectForEntityForName:@"Course" inManagedObjectContext:context];
art.name = @"Art";
[art addStudentsObject:aStudent];
[art addStudentsObject:aStudent2];
[art addStudentsObject:cStudent];
Course *reallyHardCourse = [NSEntityDescription insertNewObjectForEntityForName:@"Course" inManagedObjectContext:context];
reallyHardCourse.name = @"CompSci-521";
[reallyHardCourse addStudentsObject:failingStudent1];
[reallyHardCourse addStudentsObject:failingStudent2];
Professor *hawkins = [NSEntityDescription insertNewObjectForEntityForName:@"Professor" inManagedObjectContext:context];
hawkins.name = @"Stephen Hawkins";
[hawkins addCoursesObject:compSci];
NSError *saveError;
[context save:&saveError];
if (saveError) {
NSLog(@"Error saving context");
}
});
}
@end