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zeus
2025-01-22 16:22:33 +08:00
parent 09b9cec8ec
commit 738c373a77
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iOS-SwiftUI-Code/GRDB.swift-6.29.3/Tests/GRDBTests/RecordInitializersTests.swift
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import XCTest
import GRDB
// Tests about how minimal can class go regarding their initializers
// What happens for a class without property, without any initializer?
class EmptyRecordWithoutInitializer : Record {
// nothing is required
}
// What happens if we add a mutable property, still without any initializer?
// A compiler error: class 'RecordWithoutInitializer' has no initializers
//
// class RecordWithoutInitializer : Record {
// let name: String?
// }
// What happens with a mutable property, and init(row: Row)?
class RecordWithMutablePropertyAndRowInitializer : Record {
var name: String?
required init(row: Row) throws {
try super.init(row: row) // super.init(row: row) is required
self.name = "toto" // property can be set before or after super.init
}
}
// What happens with a mutable property, and init()?
class RecordWithMutablePropertyAndEmptyInitializer : Record {
var name: String?
override init() {
super.init() // super.init() is required
self.name = "toto" // property can be set before or after super.init
}
required init(row: Row) throws { // init(row) is required
try super.init(row: row) // super.init(row: row) is required
}
}
// What happens with a mutable property, and a custom initializer()?
class RecordWithMutablePropertyAndCustomInitializer : Record {
var name: String?
init(name: String? = nil) {
self.name = name
super.init() // super.init() is required
}
required init(row: Row) throws { // init(row) is required
try super.init(row: row) // super.init(row: row) is required
}
}
// What happens with an immutable property?
class RecordWithImmutableProperty : Record {
let initializedFromRow: Bool
required init(row: Row) throws { // An initializer is required, and the minimum is init(row)
initializedFromRow = true // property must be set before super.init(row: row)
try super.init(row: row) // super.init(row: row) is required
}
}
// What happens with an immutable property and init()?
class RecordWithPedigree : Record {
let initializedFromRow: Bool
override init() {
initializedFromRow = false // property must be set before super.init(row: row)
super.init() // super.init() is required
}
required init(row: Row) throws { // An initializer is required, and the minimum is init(row)
initializedFromRow = true // property must be set before super.init(row: row)
try super.init(row: row) // super.init(row: row) is required
}
}
// What happens with an immutable property and a custom initializer()?
class RecordWithImmutablePropertyAndCustomInitializer : Record {
let initializedFromRow: Bool
init(name: String? = nil) {
initializedFromRow = false // property must be set before super.init(row: row)
super.init() // super.init() is required
}
required init(row: Row) throws { // An initializer is required, and the minimum is init(row)
initializedFromRow = true // property must be set before super.init(row: row)
try super.init(row: row) // super.init(row: row) is required
}
}
class RecordInitializersTests : GRDBTestCase {
func testFetchedRecordAreInitializedFromRow() throws {
// Here we test that Record.init(row: Row) can be overridden independently from Record.init().
// People must be able to perform some initialization work when fetching records from the database.
XCTAssertFalse(RecordWithPedigree().initializedFromRow)
let dbQueue = try makeDatabaseQueue()
try dbQueue.inDatabase { db in
try db.execute(sql: "CREATE TABLE pedigrees (foo INTEGER)")
try db.execute(sql: "INSERT INTO pedigrees (foo) VALUES (NULL)")
let pedigree = try RecordWithPedigree.fetchOne(db, sql: "SELECT * FROM pedigrees")!
XCTAssertTrue(pedigree.initializedFromRow) // very important
}
}
}