148 lines
5.0 KiB
Swift
148 lines
5.0 KiB
Swift
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import Foundation
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import GRDB
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/// AppDatabase lets the application access the database.
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///
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/// It applies the pratices recommended at
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/// <https://github.com/groue/GRDB.swift/blob/master/Documentation/GoodPracticesForDesigningRecordTypes.md>
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struct AppDatabase {
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/// Creates an `AppDatabase`, and make sure the database schema is ready.
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init(_ dbWriter: any DatabaseWriter) throws {
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self.dbWriter = dbWriter
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try migrator.migrate(dbWriter)
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}
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/// Provides access to the database.
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///
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/// Application can use a `DatabasePool`, while SwiftUI previews and tests
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/// can use a fast in-memory `DatabaseQueue`.
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///
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/// See <https://swiftpackageindex.com/groue/grdb.swift/documentation/grdb/databaseconnections>
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private let dbWriter: any DatabaseWriter
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/// The DatabaseMigrator that defines the database schema.
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///
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/// See <https://swiftpackageindex.com/groue/grdb.swift/documentation/grdb/migrations>
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private var migrator: DatabaseMigrator {
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var migrator = DatabaseMigrator()
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#if DEBUG
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// Speed up development by nuking the database when migrations change
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// See <https://swiftpackageindex.com/groue/grdb.swift/documentation/grdb/migrations>
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migrator.eraseDatabaseOnSchemaChange = true
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#endif
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migrator.registerMigration("createLine") { db in
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// Create a table
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// See <https://swiftpackageindex.com/groue/grdb.swift/documentation/grdb/databaseschema>
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try db.create(table: "Line") { t in
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t.autoIncrementedPrimaryKey("id")
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t.column("body", .text).notNull()
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t.column("chap", .integer).notNull()
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t.column("book", .text).notNull()
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t.column("verse", .integer)
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}
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try db.create(table: "Ribbon") { t in
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t.autoIncrementedPrimaryKey("id")
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t.column("book", .text).notNull()
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t.column("scrollOffset", .integer).notNull()
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}
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}
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// Migrations for future application versions will be inserted here:
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// migrator.registerMigration(...) { db in
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// ...
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// }
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return migrator
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}
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}
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// MARK: - Database Access: Writes
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func load<T: Decodable>(_ filename: String) -> T {
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let data: Data
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guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
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else {
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fatalError("Couldn't find \(filename) in main bundle.")
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}
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do {
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data = try Data(contentsOf: file)
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} catch {
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fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
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}
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do {
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let decoder = JSONDecoder()
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return try decoder.decode(T.self, from: data)
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} catch {
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fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)")
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}
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}
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extension AppDatabase {
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/// Create random Lines if the database is empty.
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func createRandomLinesIfEmpty() throws {
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let imports : JsonImport = load("john_export.json")
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try dbWriter.write { db in
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if try Line.all().isEmpty(db) {
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for l in imports.lines {
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print("here")
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print(l.body)
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_ = try l.inserted(db)
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}
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// print("cat")
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// try createRandomLines(db)
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_ = try Ribbon(id: nil, book: "bible.john", scrollOffset: 0).inserted(db)
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_ = try Ribbon(id: nil, book: "bible.john", scrollOffset: 2000).inserted(db)
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}
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}
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}
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// static let uiTestLines = [
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// Line(id: nil, name: "Arthur", score: 5),
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// Line(id: nil, name: "Barbara", score: 6),
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// Line(id: nil, name: "Craig", score: 8),
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// Line(id: nil, name: "David", score: 4),
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// Line(id: nil, name: "Elena", score: 1),
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// Line(id: nil, name: "Frederik", score: 2),
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// Line(id: nil, name: "Gilbert", score: 7),
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// Line(id: nil, name: "Henriette", score: 3)]
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// func createLinesForUITests() throws {
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// try dbWriter.write { db in
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// try AppDatabase.uiTestLines.forEach { Line in
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// _ = try Line.inserted(db) // insert but ignore inserted id
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// }
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// }
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// }
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// /// Support for `createRandomLinesIfEmpty()` and `refreshLines()`.
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private func createRandomLines(_ db: Database) throws {
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for _ in 0..<500 {
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_ = try Line.makeRandom().inserted(db) // insert but ignore inserted id
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}
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}
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}
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// MARK: - Database Access: Reads
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// This demo app does not provide any specific reading method, and instead
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// gives an unrestricted read-only access to the rest of the application.
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// In your app, you are free to choose another path, and define focused
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// reading methods.
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extension AppDatabase {
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/// Provides a read-only access to the database
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var reader: DatabaseReader {
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dbWriter
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}
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}
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