An implementation of DAO pattern for CoreData and Realm (Soon). Now you can think less about database in your applications.

• Features
• Supported frameworks
• Usage
• Requirements
• Communication
• Installation
• Author
• License

Features

• CRUD operations for your database based on Monreau
• Universal built-in Translator based on Transformer with nested objects support
• Universal built-in Refresher with nested objects support
• Custom translators
• Custom refreshers
• Abstraction of database objects (models) from application objects (plains)

Supported frameworks

• CoreData
• Realm

Usage

The first thing you should know is that the primary key is a field named nioID. And you must add this field (with String type) to your CoreData models (only in CoreData scheme). Next, I'll explain everything in the example with 3 models (CategoryModelObject, PositionModelObject and AdditiveModelObject) and 3 plain objects (CategoryPlainObject, PositionPlainObject and AdditivePlainObject)

Protocols and classes

NIO contains several main classes and protocols:

• ManagedModel (class)
• TransformablePlain (protocol)
• Plain (protocol)
• Model (protocol)

ManagedModel

All of your your CoreData models must conform this protocol.

// MARK: - CategoryModelObject
class CategoryModelObject: ManagedModel {
    
    @NSManaged var id: Int64
    @NSManaged var name: String
    @NSManaged var positions: NSSet
}

// MARK: - PositionModelObject
class PositionModelObject: ManagedModel {
    
    @NSManaged var id: Int64
    @NSManaged var name: String
    @NSManaged var price: Double
    @NSManaged var additives: NSSet
    @NSManaged var category: CategoryModelObject?
}

// MARK: - AdditiveModelObject
class AdditiveModelObject: ManagedModel {
    
    @NSManaged var id: Int64
    @NSManaged var name: String
    @NSManaged var price: Double
    @NSManaged var position: PositionModelObject?
}

TransformablePlain

This protocol lets you use built-in Translator

// MARK: - CategoryPlainObject
class CategoryPlainObject: TransformablePlain {
    
    let name: String
    let id: Int64
    
    var nioID: NioID {
        return NioID(value: id)
    }
    
    var positions: [PositionPlainObject] = []
    
    init(name: String, id: Int64) {
        self.name  = name
        self.id    = id
    }
    
    required init(with resolver: Resolver) throws {
        self.id    = try resolver.value("id")
        self.name  = try resolver.value("name")
        
        self.positions = (try? resolver.value("positions")) ?? []
    }
}

// MARK: - PositionPlainObject
class PositionPlainObject: TransformablePlain {
    
    let id: Int64
    let name: String
    let price: Double
    
    var nioID: NioID {
        return NioID(value: id)
    }
    
    init(name: String, price: Double, id: Int64) {
        self.name  = name
        self.id    = id
        self.price = price
    }
    
    var category: CategoryPlainObject? = nil
    var additives: [AdditivePlainObject] = []
    
    required init(with resolver: Resolver) throws {
        
        self.id        =  try  resolver.value("id")
        self.name      =  try  resolver.value("name")
        self.price     =  try  resolver.value("price")
        self.category  =  try? resolver.value("category")
        self.additives = (try? resolver.value("additives")) ?? []
    }
}

// MARK: - AdditivePlainObject
class AdditivePlainObject: TransformablePlain {

    let id: Int64
    let name: String
    let price: Double  
    
    var nioID: NioID {
        return NioID(value: id)
    }
    
    init(name: String, price: Double, id: Int64) {
        self.name  = name
        self.id    = id
        self.price = price
    }
    
    var position: PositionPlainObject? = nil
    
    required init(with resolver: Resolver) throws {
        
        self.id       = try  resolver.value("id")
        self.name     = try  resolver.value("name")
        self.price    = try  resolver.value("price")
        self.position = try? resolver.value("position")
    }
}

Plain

If you want to use custom Translator, use this protocol - just conform it and write your own Translator. Example

Initialization

/// Standard initializer with built-in Translator and Refresher
let dao = Nio.coredata(named: "AppModel", model: UserModelObject.self, plain: UserPlainObject.self)

/// Initializer with with built-in Translator and custom Refresher
let dao = Nio.coredata(named: "AppModel", refresher: refresher)

/// Initializer with custom Translator and built-in Refresher
let dao = Nio.coredata(named: "AppModel", translator: translator)

/// Initializer with custom Translator and Refresher
let dao = Nio.coredata(named: "AppModel", refresher: refresher, translator: translator)

/// Standard initializer for unit testing with built-in Translator and Refresher
let dao = Nio.coredataInMemory(named: "AppModel", model: UserModelObject.self, plain: UserPlainObject.self)

/// Initializer for unit testing with with built-in Translator and custom Refresher
let dao = Nio.coredataInMemory(named: "AppModel", refresher: refresher)

/// Initializer for unit testing with custom Translator and built-in Refresher
let dao = Nio.coredataInMemory(named: "AppModel", translator: translator)

/// Initializer for unit testing with custom Translator and Refresher
let dao = Nio.coredataInMemory(named: "AppModel", refresher: refresher, translator: translator)

/// Standard initializer with context, built-in Translator and Refresher
let dao = Nio.coredata(withContext: context, model: UserModelObject.self, plain: UserPlainObject.self)

/// Standard initializer with context, built-in Translator and custom Refresher
let dao = Nio.coredata(withContext: context, refresher: refresher)

/// Standard initializer with context, custom Translator and built-in Refresher
let dao = Nio.coredata(withContext: context, translator: translator)

/// Standard initializer with context, custom Translator and Refresher
let dao = Nio.coredata(withContext: context, translator: translator, refresher: refresher)

CRUD operations

Create

let category = CategoryPlainObject(name: "Category #1", id: 1)
let position = PositionPlainObject(name: "Position #1", price: 225.0, id: 1)

position.additives = [
    AdditivePlainObject(name: "Additive #1", price: 20.0, id: 1),
    AdditivePlainObject(name: "Additive #2", price: 30.0, id: 2)
]

category.positions = [position]

/// Add model to your database (positions and additives will be added automatically)
try dao.create(category)

Read

/// Read all models
let categories = try dao.read()

/// Read models by filter
let categories = try dao.read(byPredicate: "id > 5")

/// Read models by NSPredicate
let predicate  = NSPredicate(format: "name = %@", name)            
let categories = try dao.read(byPredicate: predicate, orderedBy: "name", ascending: true)

/// Read model by primary key
let categories = try dao.read(byPrimaryKey: category.nioID)

/// Read models by filter with sorting
let categories = try dao.read(byPredicate: "id > 5", orderedBy: "name", ascending: true)

Update

/// Update your model
try dao.persist(category)

/// Update your models.
/// if erase == true then dao delete all models before persist
try dao.persist(categories, erase: true)

/// We recommend to use it in the following cases:
/// 1. If you have big and complex database schema (many entities, many relationships)
/// 2. If you have thousands of objects
try dao.persistAsync(categories, erase: false, success: { 

    /// Success
    
}, failure: { error in

    /// Error       
})

Delete

/// Delete all models
try dao.erase()

/// Delete concrete models
try dao.erase(plains: categories)

/// Delete models by filter
try dao.erase(byPredicate: "id < 5")

/// Delete model by primary key
try dao.erase(byPrimaryKey: category.nioID)

/// Delete models by primary keys
try dao.erase(byPrimaryKeys: keys)

Custom Translators

If you want to use custom Translator, your PlainObject class must conform Plain protocol and your ModelObject class (CoreData, Realm objects...) must conform Model protocol

class CategoryTranslator: Translator {
    
    func translate(model: CategoryModelObject) throws -> CategoryPlainObject {
        /// Make plain from model here
    }
}

/// Create DAO instance
let dao = Nio.coredata(named: "AppModel", translator: CategoryTranslator())

Custom Refreshers

If you want to use custom Refresher, your PlainObject class must conform Plain protocol and your ModelObject class (CoreData, Realm objects...) must conform Model protocol

class CategoryRefresher: Refresher {
    
    func refresh(_ model: CategoryModelObject, withPlain plain: CategoryPlainObject) throws {
        /// Fill model from plain here
    }
}

/// Create DAO instance
let dao = Nio.coredata(named: "AppModel", refresher: CategoryRefresher())

Requirements

• iOS 10.0+ / macOS 10.12+ / tvOS 10.0+ / watchOS 3.0+
• Xcode 8.1, 8.2, 8.3, and 9.0
• Swift 3.0, 3.1, 3.2, and 4.0

Communication

• If you found a bug, open an issue.
• If you have a feature request, open an issue.
• If you want to contribute, submit a pull request.

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

To integrate Nio into your Xcode project using CocoaPods, specify it in your Podfile:

use_frameworks!

target "<Your Target Name>" do
    pod "NIO"
end

Then, run the following command:

$ pod install

Manually

If you prefer not to use any dependency managers, you can integrate Nio into your project manually.

Embedded Framework

• Open up Terminal, cd into your top-level project directory, and run the following command "if" your project is not initialized as a git repository:

  $ git init

• Add Nio as a git submodule by running the following command:

  $ git submodule add https://github.com/incetro/NIO.git

• Open the new Nio folder, and drag the Nio.xcodeproj into the Project Navigator of your application's Xcode project.

  It should appear nested underneath your application's blue project icon. Whether it is above or below all the other Xcode groups does not matter.

• Select the Nio.xcodeproj in the Project Navigator and verify the deployment target matches that of your application target.

• Next, select your application project in the Project Navigator (blue project icon) to navigate to the target configuration window and select the application target under the "Targets" heading in the sidebar.

• In the tab bar at the top of that window, open the "General" panel.

• Click on the + button under the "Embedded Binaries" section.

• You will see two different Nio.xcodeproj folders each with two different versions of the Nio.framework nested inside a Products folder.

  It does not matter which Products folder you choose from, but it does matter whether you choose the top or bottom Nio.framework.

• Select the top Nio.framework for iOS and the bottom one for OS X.

  You can verify which one you selected by inspecting the build log for your project. The build target for Nio will be listed as either Nio iOS, Nio macOS, Nio tvOS or Nio watchOS.

• And that's it!

  The Nio.framework is automagically added as a target dependency, linked framework and embedded framework in a copy files build phase which is all you need to build on the simulator and a device.

Author

incetro, incetro@ya.ru

License

NIO is available under the MIT license. See the LICENSE file for more info.