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

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

Last synced: about 2 months ago
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ios-queryable is an implementation of IQueryable/IEnumerable for Core Data

• Host: GitHub
• URL: https://github.com/martydill/ios-queryable
• Owner: martydill
• License: mit
• Created: 2012-11-11T20:55:42.000Z (about 12 years ago)
• Default Branch: master
• Last Pushed: 2015-09-01T20:42:30.000Z (over 9 years ago)
• Last Synced: 2024-10-19T18:28:23.888Z (about 2 months ago)
• Language: Objective-C
• Size: 607 KB
• Stars: 227
• Watchers: 15
• Forks: 18
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
#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.