ios-queryable is an implementation of IQueryable/IEnumerable for Core Data
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Latest commit a80c5a8 Sep 2, 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.

#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'"]

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.