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WIP: Migrations

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John Estropia
2017-04-20 20:26:11 +09:00
parent a543a4c94a
commit 02a660e4a6
11 changed files with 205 additions and 77 deletions
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24
Sources/Setup/Dynamic Models/SchemaHistory.swift
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@@ -29,14 +29,30 @@ import Foundation
// MARK: - SchemaHistory
/**
The `SchemaHistory` encapsulates all model versions that is relevant to the data model, including past versions.
- SeeAlso: SchemaHistory.currentModelVersion
- SeeAlso: SchemaHistory.migrationChain
*/
public final class SchemaHistory: ExpressibleByArrayLiteral {
// MARK: -
/**
The version string for the current model version. The `DataStack` will try to migrate all `StorageInterface`s added to itself to this version, following the version steps provided by the `migrationChain`.
*/
public let currentModelVersion: ModelVersion
/**
The version string for the current model version. The `DataStack` will try to migrate all `StorageInterface`s added to itself to this version, following the version steps provided by the `migrationChain`.
*/
public let migrationChain: MigrationChain
/**
Initializes a `SchemaHistory` with all models declared in the specified (.xcdatamodeld) model file.
- Important: Use this initializer only if all model versions are either `XcodeDataModelSchema`s or `LegacyXcodeDataModelSchema`s. Do not use this initializer if even one of the model versions is a `CoreStoreSchema`; use the `SchemaHistory.init(allSchema:migrationChain:exactCurrentModelVersion:)` initializer instead.
- parameter modelName: the name of the (.xcdatamodeld) model file. If not specified, the application name (CFBundleName) will be used if it exists, or "CoreData" if it the bundle name was not set.
- parameter bundle: an optional bundle to load models from. If not specified, the main bundle will be used.
- parameter migrationChain: the `MigrationChain` that indicates the sequence of model versions to be used as the order for progressive migrations. If not specified, will default to a non-migrating data stack.
*/
public convenience init(modelName: XcodeDataModelFileName, bundle: Bundle = Bundle.main, migrationChain: MigrationChain = nil) {
guard let modelFilePath = bundle.path(forResource: modelName, ofType: "momd") else {
@@ -92,7 +108,7 @@ public final class SchemaHistory: ExpressibleByArrayLiteral {
for modelVersion in modelVersions {
let fileURL = modelFileURL.appendingPathComponent("\(modelVersion).mom", isDirectory: false)
allSchema.append(XcodeDataModel(modelVersion: modelVersion, modelVersionFileURL: fileURL))
allSchema.append(XcodeDataModelSchema(modelVersion: modelVersion, modelVersionFileURL: fileURL))
}
self.init(
allSchema: allSchema,