FacadeSwift

[](https://travis-ci.org/Olivier Thierry/FacadeSwift)

Introduction

DOCUMENTATION IN PROGRESS

Facade acts as a facade between your app and CoreData. It makes configuration and usage a lot easier, provides flexible parent-child architecture and powerful querying APIs.

Facade.Stack builds an optimized Parent/Child stack architecture that allows efficient read and asynchronous write operations for persistence phase along with detached transactions.

Installation

FacadeSwift is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "FacadeSwift"

Usage

Setup

facade_stack.config.storeName = "MyApp"
facade_stack.connect()

That's all you need to do to start using Facade. More deeper configuration and usage, see the documentation bellow.

Using a data seed

You can use a seed when setting up your database for the first time.

facade_stack.config.seedURL = NSBundle.mainBundle()
  .URLForResource(
    "myseed",
    withExtension: "sqlite")

// Install the seed
try! facade_stack.seed()
try! facade_stack.connect()

Droping database

// Check that database exists before trying to drop it
if facade_stack.installed {
  try! facade_stack.drop()
}

Using a different datamodel schema

If your datamodel schema is not in your main bundle (in a framework or resource bundle), you will have to provide the URL so that CoreData can fetch it.

facade_stack.config.modelURL = myBundle
  .URLForResource(
    "MyAppDataModel",
    withExtension: "momd")

Using CoreData built-in options

Of course you can use CoreData built-in options by using the attribute options of the shared Config

facade_stack.config.options[NSMigratePersistentStoresAutomaticallyOption] = true
facade_stack.config.options[NSInferMappingModelAutomaticallyOption] = true

Connecting to the database

After the configuration phase, you must establish a connection to the database. This operation adds the persistent store to the persistent store coordinator.

try! facade_stack.connect()

Query API

The Query API is flexible and powerful. You don't need to take care of the backend of NSFetchRequest or SQLite or anything. You can just use high level APIs and focus of the functional part of your app.

Query options

• Matching options

  • CaseInsensitive
  • DiacriticInsensitive

• Customizing query

  • limit(_:): Documentation in progress
  • offset(_:): Documentation in progress
  • fetchBatchSize(_:): Documentation in progress
  • prefetch(_:): Documentation in progress
  • faults(_:): Documentation in progress
  • groupBy(_:): Documentation in progress
  • refresh(_:): Documentation in progress

Choosing query managed object context

By default, a request always executes in facade_stack.mainManagedObjectContext. You can override this behaviour by giving the context is which the query must execute.

let user = facade_query(User)
  .inManagedObjectContext(myCustomContext)
  .first()

Predicates

with(_:equalTo:options:) / with(_:notEqualTo:options:)

let recipes = facade_query(Recipe)
  .with("difficulty", equalTo: 3)
  .all()

let users = facade_query(User)
  .with(
    "firstname",
    notEqualTo: "olivier",
    options: [
      .CaseInsensitive,
      .DiacriticInsensitive])
  .all()

with(_:containedIn:) / with(_:notContainedIn:)

let user = facade_query(User)
  .with(
    "email",
    containedIn: [
      "olivier@save.co",
      "olivier.thierry42@gmail.com"])
  .first()

let roles = facade_query(Role)
  .limit(2)
  .all()

let users = facade_query(User)
  .with(
    "role",
    notContainedIn: roles)
  .all()

with(_:containingAll:) / with(_:containingNone:) / with(_:containingAny:)

let recipes = facade_query(Recipe)
  .with("ingredients", containingAll: listOfAvailableIngredients)
  .all()

let recipes = facade_query(Recipe)
  .with("ingredients", containingAny: listOfAvailableIngredients)
  .all()

let recipes = facade_query(Recipe)
  .with("ingredients", containingNone: listOfAvailableIngredients)
  .all()

with(_:containing:options:) / with(_:like:options:)

let users = facade_query(User)
  .with(
    "firstname",
    containing: "liv")
  .all()

let users = facade_query(User)
  .with(
    "firstname",
    like: "oliv%",
    options: [.CaseInsensitive])
  .all()

with(_:existing:)

Predicate to match property that exists (!= nil) or don't exists (== nil)

let usersWithoutEmail = facade_query(User)
  .with("email", existing: false)
  .all()

with(_:startingWith:options:) / with(_:endingWith:options:)

These functions are syntatic functions for LIKE pattern% and LIKE %pattern

let users = facade_query(User)
  .with("email", endingWith: "@gmail.com")
  .all()

with(_:greaterThan:) / with(_:greaterThanOrEqual:) / with(_:lowerThan:) / with(_:lowerThanOrEqual:)

let users = facade_query(User)
  .with("age", greaterThanOrEqual: 18)
  .all()

.or()

let recipes = facade_queryOr([
    // Vegan AND difficulty maximum (5)
    facade_query(Recipe)
      .with("difficulty", equalTo: 5)
      .with("vegan", equalTo: true),
    // Non-vegan AND difficulty between 3-5
    facade_query(Recipe)
      .with("difficulty", greaterThanOrEqualTo: 3)
      .with("vegan", equalTo: false)
  ])
  // In both case, we want recipes to take less than 30 mins to cook
  .with("time", lessThanOrEqualTo: 30)
  .sort("difficulty")
  .all()

Sorting results

By default, using sort(_:) will sort results in ascending order.

facade_query(User)
  .sort("email")
  .all()

// Is exactly the same as

facade_query(User)
  .sort("email ASC")
  .all()

You can add DESC or desc (case insensitive) to your sort predidcate to change sorting order,

facade_query(User)
  .sort("email DESC")
  .all()

Delete / Batch deletes

You can directly delete/batch delete matching results from the query object

facade_query(Recipe)
  .with("favorite", equalTo: false)
  .delete()

facade_query(Recipe)
  .with("favorite", equalTo: false)
  .batchDelete() // Async delete using NSBatchDeleteRequest

all() VS. execute() VS count()

There's 3 ways to execute a query.

• count() will as its name says, returns a simple count of matching entities.
• all() will always return an array of [A] where A is your entity type.
• execute() has 3 signatures
• execute() -> [A]: Behaves the same way as all()
• execute() -> [NSManagedObjectID]: Will set the result type of the fetch request to .ManagedObjectIDResultType and returns an array of NSManagedObjectIDs.
• execute() -> [NSDictionary]: Will set the result type of the fetch request to .DictionaryResultType and returns a raw representation of the objects as instances of NSDictionarys

On most case, I just use execute() and let the compiler infer the type I am waiting for, which it is pretty good at <3.

first() & last()

In some case, you want to fetch the first or last object matching your query. By default, first() and last() will behave exactly the same. By default, this means that query.first() === query.last(). Because those 2 methods set a limit of 1 and sort the results set by facade_stack.config.modelPrimaryKey which will have no effect if you did not set it in first place.

During your stack configuration. Add the following

facade_stack.config.modelPrimaryKey = "id"

From now on, query.first() != query.last() (unless of course query.count() <= 1) as Facade will detect the default primary key and sort the result accordingly.

Facade.Query to NSFetchedResultsController

Documentation in progress

Elastic Query

Documentation in progress

Transactions

Documentation in progress

Operators

• <->: Documentation in progress
• <=>: Documentation in progress
• </>: Documentation in progress
• <-: Documentation in progress

Author

Olivier Thierry, olivier.thierry42@gmail.com

License

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