SchemaHistory

public final class SchemaHistory : ExpressibleByArrayLiteral

extension SchemaHistory: CustomDebugStringConvertible, CoreStoreDebugStringConvertible

The SchemaHistory encapsulates multiple DynamicSchema across multiple model versions. It contains all model history and is used by the DataStack to

currentModelVersion
The version string for the current model version. The DataStack will try to migrate all StorageInterfaces added to itself to this version, following the version steps provided by the migrationChain.
Declaration
Swift

public let currentModelVersion: ModelVersion
currentSchema
The schema for the current model version. The DataStack will try to migrate all StorageInterfaces added to itself to this version, following the version steps provided by the migrationChain.
Declaration
Swift

public var currentSchema: DynamicSchema { get }
migrationChain
The version string for the current model version. The DataStack will try to migrate all StorageInterfaces added to itself to this version, following the version steps provided by the migrationChain.
Declaration
Swift

public let migrationChain: MigrationChain


                    
                    
                    init(_:migrationChain:)

Convenience initializer for a SchemaHistory created from a single xcdatamodeld file.

Declaration

Swift

public convenience init(_ xcodeDataModeld: (allSchema: [XcodeDataModelSchema], currentModelVersion: ModelVersion), migrationChain: MigrationChain = nil)

Parameters

`xcodeDataModeld`	a tuple returned from the `XcodeDataModelSchema.from(modelName:bundle:migrationChain:)` method.
`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.


                    
                    
                    init(_:_:migrationChain:exactCurrentModelVersion:)

Initializes a SchemaHistory with a list of DynamicSchema and a MigrationChain to describe the order of progressive migrations.

Declaration

Swift

public convenience init(_ schema: DynamicSchema, _ otherSchema: DynamicSchema..., migrationChain: MigrationChain = nil, exactCurrentModelVersion: String? = nil)

Parameters

`schema`	a `DynamicSchema` that represents a model version
`otherSchema`	a list of `DynamicSchema` that represent other model versions
`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.
`exactCurrentModelVersion`	an optional string to explicitly select the current model version string. This is useful if the `DataStack` should load a non-latest model version (usually to prepare data before migration). If not provided, the current model version will be computed from the `MigrationChain`.


                    
                    
                    init(allSchema:migrationChain:exactCurrentModelVersion:)

Initializes a SchemaHistory with a list of DynamicSchema and a MigrationChain to describe the order of progressive migrations.

Declaration

Swift

public required init(allSchema: [DynamicSchema], migrationChain: MigrationChain = nil, exactCurrentModelVersion: String? = nil)

Parameters

`allSchema`	a list of `DynamicSchema` that represent model versions
`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.
`exactCurrentModelVersion`	an optional string to explicitly select the current model version string. This is useful if the `DataStack` should load a non-latest model version (usually to prepare data before migration). If not provided, the current model version will be computed from the `MigrationChain`.

ExpressibleByArrayLiteral


                    
                    
                    init(arrayLiteral:)

Declaration

Swift

public convenience init(arrayLiteral elements: DynamicSchema...)

CustomDebugStringConvertible


                    
                    
                    debugDescription

Declaration

Swift

public var debugDescription: String { get }