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https://github.com/martydill/ios-queryable

ios-queryable is an implementation of IQueryable/IEnumerable for Core Data
https://github.com/martydill/ios-queryable

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ios-queryable is an implementation of IQueryable/IEnumerable for Core Data

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#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:

```objc

NSArray* widgets = [[[[[self.managedObjectContext ofType:@"Widget"]

			where:@"Type == 'abc'"]

			orderBy:@"createddate"]

			take:5]

			toArray];

```



instead of like this:

```objc

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:

```objc

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.