Defining a Custom Sync Up Target

You define custom targets for sync up operations by subclassing your platform’s abstract base class for sync up targets. To use custom targets in hybrid apps, you’re required to implement a custom native target class for each platform you support. The base sync up target classes are:

iOS:

Swift Objective-C

SyncUpTarget SFSyncUpTarget
Android: SyncUpTarget

Swift	Objective-C
`SyncUpTarget`	`SFSyncUpTarget`

Handling Field Lists in Create and Update Operations

A target’s Create On Server and Update On Server methods operate only on the list of fields specified in their argument lists. However, a Salesforce object can require the target to create certain fields that can’t be updated by apps. With these objects, a target that uses a single field list for both create and update operations can fail if it tries to update locked fields.

To specify distinct field lists for create and update operations, you can use an initializer method that supports createFieldlist and updateFieldlist parameters. This option can save you the effort of defining a custom target if you’re doing so only to provide these field lists.

iOS

Call the following SFSyncUpTarget init method:

Swift

1SyncUpTarget.init(createFieldlist: [Any]?, updateFieldlist: [Any]?)

Here's an example:

1SyncUpTarget.init(createFieldlist: nil, updateFieldlist: ["Name"])

Objective-C

1- (instancetype)initWithCreateFieldlist:(NSArray *)createFieldlist
2                        updateFieldlist:(NSArray *)updateFieldlist

If you provide the createFieldlist and updateFieldlist arguments, the target uses them where applicable. In those cases, the target ignores the field list defined in the sync options object.

Android

Use the following SyncUpTarget constructor:

1public SyncUpTarget(List<String> createFieldlist, List<String> updateFieldlist)

If you provide the createFieldlist and updateFieldlist arguments, the target uses them where applicable. In those cases, the target ignores the field list defined in the SyncOptions object.

Required Methods

Every custom target class must implement the following required methods.

Create On Server Method

Sync up a locally created record. Hybrid and React native apps can override the fields parameter by calling syncUp with the optional createFieldList parameter.

iOS:

Swift

1func createOnServer(syncManager: SyncManager, 
2                         record: [AnyHashable : Any], 
3                      fieldlist: [Any], 
4                     onComplete: SyncUpcompletionBlock([AnyHashable : Any]?) 
5                                     -> Void, 
6                         onFail: SyncUpErrorBlock(Error) -> Void)

Objective-C

1- (void) createOnServer:(NSString*)objectType 
2                 fields:(NSDictionary*)fields 
3        completionBlock:(SFSyncUpTargetCompleteBlock)
4                        completionBlock 
5              failBlock:(SFSyncUpTargetErrorBlock)failBlock;

Android:

1String createOnServer(SyncManager syncManager, 
2    String objectType, Map<String, Object> fields);

Update On Server Method

Sync up a locally updated record. For the objectId parameter, Mobile Sync uses the field specified in the getIdFieldName() method (Android) or the idFieldName property (iOS) of the custom target. Hybrid and React native apps can override the fields parameter by calling syncUp with the optional updateFieldList parameter.

iOS:

Swift

1func updateOnServer(syncManager: SyncManager, 
2                         record: [AnyHashable : Any], 
3                      fieldlist: [Any], 
4                     onComplete: SyncUpcompletionBlock([AnyHashable : Any]?) 
5                                     -> Void, 
6                         onFail: SyncUpErrorBlock(Error) -> Void)

Objective-C

1- (void) updateOnServer:(NSString*)objectType 
2               objectId:(NSString*)objectId 
3                 fields:(NSDictionary*)fields 
4        completionBlock:(SFSyncUpTargetCompleteBlock)
5                        completionBlock 
6              failBlock:(SFSyncUpTargetErrorBlock)failBlock;

Android:

updateOnServer(SyncManager syncManager, String objectType, String objectId, Map<String, Object> fields);

Delete On Server Method

Sync up a locally deleted record. For the objectId parameter, Mobile Sync uses the field specified in the getIdFieldName() method (Android) or the idFieldName property (iOS) of the custom target.

iOS:

Swift

1func deleteOnServer(syncManager: SyncManager, 
2                         record: [AnyHashable : Any], 
3                      fieldlist: [Any], 
4                     onComplete: SyncUpcompletionBlock([AnyHashable : Any]?) 
5                                     -> Void, 
6                         onFail: SyncUpErrorBlock(Error) -> Void)

Objective-C

1- (void) deleteOnServer:(NSString*)objectType 
2               objectId:(NSString*)objectId 
3        completionBlock:(SFSyncUpTargetCompleteBlock)
4                        completionBlock 
5              failBlock:(SFSyncUpTargetErrorBlock)failBlock;

Android:

1deleteOnServer(SyncManager syncManager, String objectType, 
2    String objectId);

Optional Configuration Changes

Optionally, you can override the following values in your custom class.

getIdsOfRecordsToSyncUp

List of record IDs returned for syncing up. By default, these methods return any record where __local__ is true.

iOS:

Swift

1func getIdsOfRecords(toSyncUp: SyncManager, soupName: String)

Objective-C

1- (NSArray*) 
2getIdsOfRecordsToSyncUp:(SFMobileSyncSyncManager*)syncManager 
3               soupName:(NSString*)soupName;

Android:

1Set<String> getIdsOfRecordsToSyncUp(SyncManager syncManager, 
2    String soupName);

Modification Date Field Name

Field used during a LEAVE_IF_CHANGED sync up operation to determine whether a record was remotely modified. Default value is lastModifiedDate.

iOS (Swift and Objective-C):

modificationDateFieldName property

Android:

1String getModificationDateFieldName();

isNewerThanServer

Determines whether a soup element is more current than the corresponding server record.

iOS:

Swift

1func isNewerThanServer(syncManager: SyncManager, 
2                            record: [AnyHashable : Any], 
3                       resultBlock: RecordNewerThanServerBlock(Bool) -> Void)

Objective-C

1- (void)isNewerThanServer:(SFMobileSyncSyncManager *)syncManager
2                   record:(NSDictionary*)record
3              resultBlock:(SFSyncUpRecordNewerThanServerBlock)resultBlock;

Android:

1public boolean isNewerThanServer(SyncManager syncManager, 
2    JSONObject record) throws JSONException, IOException

ID Field Name

Field used to get the ID of the record. For example, during sync up, Mobile SDK obtains the ID that it passes to the updateOnServer() method from the field whose name matches idFieldName in the local record.

iOS (Swift and Objective-C):: idFieldName property
Android:: String getIdFieldName();

Mobile SDK Development Guide

Defining a Custom Sync Up Target

Handling Field Lists in Create and Update Operations

Required Methods