ios-queryable is an implementation of IQueryable/IEnumerable for Core Data
Objective-C
Latest commit a80c5a8 Sep 1, 2015 @martydill -Fixed inefficiencies and potential bugs in the fast enumeration supp…
…ort by caching the results of the toArray call. Resolves #7.

-Tweaked test setup so that each test runs with a fresh copy of the test data. Makes it easier to work with tests that modify the data.
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ios-queryable.xcodeproj Switched to XCTest and fixed a couple of warnings Jun 6, 2015
ios-queryable -Fixed inefficiencies and potential bugs in the fast enumeration supp… Sep 1, 2015
ios-queryableTests
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README.md Update README.md Dec 14, 2012

README.md

ios-queryable is an Objective-C category that provides IQueryable and IEnumerable-like functionality to Core Data.

Tired of writing boilerplate Core Data code? Can't live without LINQ? ios-queryable is for you!

It supports query composition and deferred execution, and implements a subset of IEnumerable's methods, including where, take, skip, orderBy, first/firstOrDefault, single/singleOrDefault, count, any, and all.

It lets you write code like this:

NSArray* widgets = [[[[[self.managedObjectContext ofType:@"Widget"]
            where:@"Type == 'abc'"]
            orderBy:@"createddate"]
            take:5]
            toArray];

instead of like this:

NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription* entity = [NSEntityDescription
                               entityForName:@"Widget" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];

NSPredicate* predicate = [NSPredicate predicateWithFormat: @"type == 'abc'"];
[fetchRequest setPredicate:predicate];

NSSortDescriptor* sortDescriptor = [[NSSortDescriptor alloc]
                                    initWithKey:@"createddate" ascending:YES];

NSArray* sortDescriptors = [[NSArray alloc] initWithObjects: sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];

[fetchRequest setFetchLimit:5];   
NSError* error;
NSArray* widgets = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];

It also supports the NSFastEnumeration protocol, allowing for easy use in foreach loops:

foreach(Widget* widget in [self.managedObjectContext ofType:@"Widget"])
{
    // Do widgety stuff
}

Usage

To use ios-queryable, simply copy NSManagedObjectContext+IQueryable.h and NSManagedObjectContext+IQueryable.m into your project folder. Then, simply include the header file, and start writing your queries!

For examples, check out the tests in the tests project.