Realm Japan meetup #13

- Release Realm React Native!
- Background query (Collection notifications)
- How to use subquery

Transcript

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5. Realm ReactNative 0.10.0 on 2016.2.21
8. const Realm = require('realm'); class AwesomeProject extends Component { render() { class Person {} Dog.schema = { name: 'Dog', primaryKey: 'name', properties: { name: 'string', age: {type: 'int', default: 0}, }, }; const realm = new Realm({schema: [Dog]}); realm.write(() => { realm.create('Dog', { name: 'Hal Incandenza', age: 17 }); }); return ( <View style={styles.container}> <Text style={styles.welcome}> Count of Dogs in Realm: {realm.objects('Dog').length} </Text> </View> ); } }
9. const Realm = require('realm'); class AwesomeProject extends Component { render() { class Person {} Dog.schema = { name: 'Dog', primaryKey: 'name', properties: { name: 'string', age: {type: 'int', default: 0}, }, }; const realm = new Realm({schema: [Dog]}); realm.write(() => { realm.create('Dog', { name: 'Hal Incandenza', age: 17 }); }); return ( <View style={styles.container}> <Text style={styles.welcome}> Count of Dogs in Realm: {realm.objects('Dog').length} </Text> </View> ); } }
10. const Realm = require('realm'); class AwesomeProject extends Component { render() { class Person {} Dog.schema = { name: 'Dog', primaryKey: 'name', properties: { name: 'string', age: {type: 'int', default: 0}, }, }; const realm = new Realm({schema: [Dog]}); realm.write(() => { realm.create('Dog', { name: 'Hal Incandenza', age: 17 }); }); return ( <View style={styles.container}> <Text style={styles.welcome}> Count of Dogs in Realm: {realm.objects('Dog').length} </Text> </View> ); } }
11. const Realm = require('realm'); class AwesomeProject extends Component { render() { class Person {} Dog.schema = { name: 'Dog', primaryKey: 'name', properties: { name: 'string', age: {type: 'int', default: 0}, }, }; const realm = new Realm({schema: [Dog]}); realm.write(() => { realm.create('Dog', { name: 'Hal Incandenza', age: 17 }); }); return ( <View style={styles.container}> <Text style={styles.welcome}> Count of Dogs in Realm: {realm.objects('Dog').length} </Text> </View> ); } }
12. const Realm = require('realm'); class AwesomeProject extends Component { render() { class Person {} Dog.schema = { name: 'Dog', primaryKey: 'name', properties: { name: 'string', age: {type: 'int', default: 0}, }, }; const realm = new Realm({schema: [Dog]}); realm.write(() => { realm.create('Dog', { name: 'Hal Incandenza', age: 17 }); }); return ( <View style={styles.container}> <Text style={styles.welcome}> Count of Dogs in Realm: {realm.objects('Dog').length} </Text> </View> ); } }
13. const Realm = require('realm'); class AwesomeProject extends Component { render() { class Person {} Dog.schema = { name: 'Dog', primaryKey: 'name', properties: { name: 'string', age: {type: 'int', default: 0}, }, }; const realm = new Realm({schema: [Dog]}); realm.write(() => { realm.create('Dog', { name: 'Hal Incandenza', age: 17 }); }); return ( <View style={styles.container}> <Text style={styles.welcome}> Count of Dogs in Realm: {realm.objects('Dog').length} </Text> </View> ); } }
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18. ⟃⵸ך3FBMNח㼎ׅ׷鸐濼 notificationToken = realm.addNotificationBlock { (notification, realm) in ... }
19. 3FTVMUT5ח㼎ׅ׷鸐濼 timeline = realm.objects(Tweet) .sorted("createdAt", ascending: false) notificationToken = timeline?.addNotificationBlock { (results, error) -> () in if let _ = error { return } count = results.count self.tableView.reloadData() } return count
20. timeline = realm.objects(User) notificationToken = timeline?.addNotificationBlock { (results, error) -> () in if let _ = error { return } self.tableView.reloadData() } 3FTVMUT5ח㼎ׅ׷鸐濼
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23. class Project: Object { dynamic var id = "" dynamic var name = "" let todos = List<Todo>() override class func primaryKey() -> String? { return "id" } } class Todo: Object { dynamic var name = "" dynamic var completionDate: NSDate? dynamic var user: User? } class User: Object { dynamic var name = "" }
24. class Project: Object { dynamic var id = "" dynamic var name = "" let todos = List<Todo>() override class func primaryKey() -> String? { return "id" } } class Todo: Object { dynamic var name = "" dynamic var completionDate: NSDate? dynamic var user: User? } class User: Object { dynamic var name = "" }
25. class Project: Object { dynamic var id = "" dynamic var name = "" let todos = List<Todo>() override class func primaryKey() -> String? { return "id" } } class Todo: Object { dynamic var name = "" dynamic var completionDate: NSDate? dynamic var user: User? } class User: Object { dynamic var name = "" }
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28. let projects = realm .objects(Project) .filter("ANY todos.completionDate == nil AND ANY todos.user.name == %@", "Katsumi") print(projects)
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30. let todos = realm .objects(Todo) .filter("completionDate == nil AND user.name == %@", "Katsumi") let projects = realm.objects(Project).filter("ANY todos IN %@", todos) print(projects)
31. "SUBQUERY(todos, $todo, $todo.completionDate = nil AND $todo.user.name = 'Katsumi').@count > 0"
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