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The MERGE statement conflicted with the FOREIGN KEY constraint on v0.9

See original GitHub issue

Our setup

We have a DownloadOnly setup.

public SyncAgent CreateSyncAgent()
{
    var source = CreateSourceProvider(
        databasesConfig.DataSync.RemoteDbProvider,
        databasesConfig.DataSync.RemoteDbConnectionString);

    var target = CreateTargetProvider(
        databasesConfig.RulesDbProvider,
        databasesConfig.RulesDbConnectionString);

    var agent = new SyncAgent(target, source, new SyncOptions(), GetSetup());

    // Fix for "Invalid object name" exception https://github.com/Mimetis/Dotmim.Sync/issues/563
    agent.LocalOrchestrator.OnApplyChangesFailed(args =>
    {
        if (args.Conflict.Type == ConflictType.RemoteIsDeletedLocalIsDeleted
            && args.Resolution == ConflictResolution.ClientWins)
        {
            args.Resolution = ConflictResolution.ServerWins;
        }
    });

    return agent;
}

private SyncSetup GetSetup()
{
    var dbStructure = dbStructureClient.GetTablesAndColumns();

    var syncSetup = new SyncSetup(dbStructure.Select(x => x.Key));
    foreach (var table in syncSetup.Tables)
    {
        table.SyncDirection = SyncDirection.DownloadOnly;
        table.Columns.AddRange(dbStructure[table.TableName]);
    }

    return syncSetup;
}

Scenario

We sometimes get exceptions when we remove a record from the source db. We ran on 0.9.1 and upgraded last week to 0.9.3 but it still happens. It didn’t appear on older versions.

The previous sync was succesfull “Synchronized 8 changes in dbname database in 648ms” The next sync fails with message below.

Exception

The MERGE statement conflicted with the FOREIGN KEY constraint “FK_Parking_Badges_Parking_Drivers_DriverId”. The conflict occurred in database “dbname”, table “dbtable”, column ‘Id’. The statement has been terminated.

type: Microsoft.Data.SqlClient.SqlException assembly: Dotmim.Sync.SqlServer, Version=0.9.3.0, Culture=neutral, PublicKeyToken=null method: Dotmim.Sync.SqlServer.Builders.SqlSyncAdapter+<ExecuteBatchCommandAsync>d__13.MoveNext outerType: Dotmim.Sync.SyncException

Stacktrace

[
    {
        "assembly": "Dotmim.Sync.Core, Version=0.9.3.0, Culture=neutral, PublicKeyToken=null",
        "method": "Dotmim.Sync.LocalOrchestrator+<ApplyChangesAsync>d__7.MoveNext",
        "level": 0,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw",
        "level": 1,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess",
        "level": 2,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification",
        "level": 3,
        "line": 0
    },
    {
        "assembly": "Dotmim.Sync.Core, Version=0.9.3.0, Culture=neutral, PublicKeyToken=null",
        "method": "Dotmim.Sync.SyncAgent+<>c__DisplayClass53_0+<<SynchronizeAsync>b__0>d.MoveNext",
        "level": 4,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw",
        "level": 5,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess",
        "level": 6,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification",
        "level": 7,
        "line": 0
    },
    {
        "assembly": "Dotmim.Sync.Core, Version=0.9.3.0, Culture=neutral, PublicKeyToken=null",
        "method": "Dotmim.Sync.SyncAgent+<SynchronizeAsync>d__53.MoveNext",
        "level": 8,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw",
        "level": 9,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess",
        "level": 10,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification",
        "level": 11,
        "line": 0
    },
    {
        "assembly": "CapaCT.Edge.DataSync, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
        "method": "CapaCT.Edge.DataSync.Sync.SyncWorker+<SyncDatabase>d__10.MoveNext",
        "level": 12,
        "line": 87,
        "fileName": "/app/Capacity.Edge/CapaCT.Edge.DataSync/Sync/SyncWorker.cs"
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw",
        "level": 13,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess",
        "level": 14,
        "line": 0
    },
    {
        "assembly": "System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e",
        "method": "System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification",
        "level": 15,
        "line": 0
    },
    {
        "assembly": "CapaCT.Edge.DataSync, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
        "method": "CapaCT.Edge.DataSync.DataSyncService+<Sync>d__16.MoveNext",
        "level": 16,
        "line": 137,
        "fileName": "/app/Capacity.Edge/CapaCT.Edge.DataSync/DataSyncService.cs"
    }
]