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WIP: dynamic migrations

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John Estropia
2017-04-25 18:08:43 +09:00
parent 53ab140341
commit 54c81d23f5
7 changed files with 147 additions and 82 deletions
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101
Sources/Migrating/Migration Mapping Providers/MigrationMappingProvider.swift
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@@ -27,53 +27,78 @@ import CoreData
import Foundation
// MARK: - MigrationMappingProvider
// MARK: - SchemaMappingProvider
public protocol MigrationMappingProvider {
public protocol SchemaMappingProvider {
associatedtype SourceSchema: DynamicSchema
associatedtype DestinationSchema: DynamicSchema
var sourceSchema: DynamicSchema { get }
var destinationSchema: DynamicSchema { get }
var sourceSchema: SourceSchema { get }
var destinationSchema: DestinationSchema { get }
init(source: SourceSchema, destination: DestinationSchema)
// func migrate(
// from oldObject: SourceType,
// to newObject: DestinationType,
// transaction: UnsafeDataTransaction
// )
//
// func forEachPropertyMapping(
// from oldObject: SourceType,
// to newObject: DestinationType,
// removed: (_ keyPath: KeyPath) -> Void,
// added: (_ keyPath: KeyPath) -> Void,
// transformed: (_ keyPath: KeyPath) -> Void,
// copied: (_ keyPath: KeyPath) -> Void
// )
func createMappingModel() throws -> (mappingModel: NSMappingModel, migrationType: MigrationType)
}
public extension MigrationMappingProvider {
public protocol EntityMappingProvider {
// func migrate(from oldObject: SourceType, to newObject: DestinationType, transaction: UnsafeDataTransaction) {
//
//
// }
//
// func forEachPropertyMapping(from oldObject: SourceType, to newObject: DestinationType, removed: (_ keyPath: KeyPath) -> Void, added: (_ keyPath: KeyPath) -> Void, transformed: (_ keyPath: KeyPath) -> Void) {
//
// let oldAttributes = oldObject.cs_toRaw().entity.attributesByName
// let newAttributes = newObject.cs_toRaw().entity.attributesByName
// let oldAttributeKeys = Set(oldAttributes.keys)
// let newAttributeKeys = Set(newAttributes.keys)
// for keyPath in
// }
var source: (schema: DynamicSchema, entity: DynamicEntity) { get }
var destination: (schema: DynamicSchema, entity: DynamicEntity) { get }
func createEntityMapping() -> NSEntityMapping
}
public extension MigrationMappingProvider {
// MARK: - XcodeMappingModelProvider
open class XcodeMappingModelProvider<S: DynamicSchema, D: DynamicSchema>: SchemaMappingProvider {
private let mappingModelBundles: [Bundle]
public required init(source: SourceSchema, destination: DestinationSchema, mappingModelBundles: [Bundle] = Bundle.allBundles) {
self.sourceSchema = source
self.destinationSchema = destination
self.mappingModelBundles = mappingModelBundles
}
// MARK: SchemaMappingProvider
public typealias SourceSchema = S
public typealias DestinationSchema = D
public let sourceSchema: SourceSchema
public let destinationSchema: DestinationSchema
public func createMappingModel() throws -> (mappingModel: NSMappingModel, migrationType: MigrationType) {
let sourceModel = self.sourceSchema.rawModel()
let destinationModel = self.destinationSchema.rawModel()
if let mappingModel = NSMappingModel(
from: self.mappingModelBundles,
forSourceModel: sourceModel,
destinationModel: destinationModel) {
return (
mappingModel,
.heavyweight(
sourceVersion: self.sourceSchema.modelVersion,
destinationVersion: self.destinationSchema.modelVersion
)
)
}
let mappingModel = try NSMappingModel.inferredMappingModel(
forSourceModel: sourceModel,
destinationModel: destinationModel
)
return (
mappingModel,
.lightweight(
sourceVersion: self.sourceSchema.modelVersion,
destinationVersion: self.destinationSchema.modelVersion
)
)
}
}