private List<Employee> UpdateEmployeesWithTerritories(IEnumerable<Employee> changes)
{
var updatedEmployees = new List<Employee>();
foreach (var origEmployee in changes)
{
// Simulate serialization
var updatedEmployee = origEmployee.Clone<Employee>();
// Simulate load related entities
var addedNewTerritory = updatedEmployee.Territories.Single(t => t.TerritoryId == "91360");
var modifiedTerritory = updatedEmployee.Territories.Single(t => t.TerritoryId == "01730");
var area5 = new Area { AreaId = 5, AreaName = "Southwestern",
Territories = new ChangeTrackingCollection<Territory> { addedNewTerritory }};
var area6 = new Area { AreaId = 6, AreaName = "Central",
Territories = new ChangeTrackingCollection<Territory> { modifiedTerritory }};
addedNewTerritory.Area = area5;
modifiedTerritory.Area = area6;
// Simulate db-generated values
addedNewTerritory.Data = "yyy";
updatedEmployee.AcceptChanges();
updatedEmployees.Add(updatedEmployee);
}
return updatedEmployees;
}
public void MergeChanges_Should_Merge_Updates_For_Unchanged_Employee_With_Changed_Territories()
{
// Arrange
var database = new MockNorthwind();
var employee = database.Employees[0];
var unchangedTerritory = employee.Territories[0];
var modifiedTerritory = employee.Territories[1];
var deletedTerritory = employee.Territories[2];
var addedExistingTerritory = database.Territories[3];
var area1 = new Area { AreaId = 1, AreaName = "Northern", Territories = new ChangeTrackingCollection<Territory> { unchangedTerritory } };
var area2 = new Area { AreaId = 2, AreaName = "Southern", Territories = new ChangeTrackingCollection<Territory> { modifiedTerritory } };
var area3 = new Area { AreaId = 3, AreaName = "Eastern", Territories = new ChangeTrackingCollection<Territory> { deletedTerritory } };
var area4 = new Area { AreaId = 4, AreaName = "Western", Territories = new ChangeTrackingCollection<Territory> { addedExistingTerritory } };
var addedNewTerritory = new Territory
{
TerritoryId = "91360",
TerritoryDescription = "SouthernCalifornia",
Employees = new ChangeTrackingCollection<Employee> { employee },
AreaId = 5,
TrackingState = TrackingState.Added // Must explicitly mark as added
};
unchangedTerritory.Area = area1;
unchangedTerritory.AreaId = area1.AreaId;
modifiedTerritory.Area = area2;
modifiedTerritory.AreaId = area2.AreaId;
deletedTerritory.Area = area3;
deletedTerritory.AreaId = area3.AreaId;
addedExistingTerritory.Area = area4;
addedExistingTerritory.AreaId = area4.AreaId;
var changeTracker = new ChangeTrackingCollection<Employee>(employee);
modifiedTerritory.TerritoryDescription = "xxx"; // mod prop
modifiedTerritory.AreaId = 6; // mod FK prop
employee.Territories.Remove(deletedTerritory); // should mark area deleted
employee.Territories.Add(addedExistingTerritory); // should keep area unchanged
employee.Territories.Add(addedNewTerritory); // should keep territory added
addedExistingTerritory.Area.AreaName = "zzz"; // should mark area modified
var changes = changeTracker.GetChanges(); // should exclude unchanged territory
var updatedEmployee = UpdateEmployeesWithTerritories(changes)[0]; // rel entities, db-gen vals
// Act
changeTracker.MergeChanges(updatedEmployee);
// Assert
Assert.Contains(unchangedTerritory, employee.Territories); // Unchanged present
Assert.Equal("zzz", addedExistingTerritory.Area.AreaName); // Area name updated
Assert.Equal("yyy", addedNewTerritory.Data); // Db-generated value set
Assert.Equal(addedNewTerritory.AreaId, addedNewTerritory.Area.AreaId); // Added territory Area set
Assert.Equal(modifiedTerritory.AreaId, modifiedTerritory.Area.AreaId); // Modified territory Area set
Assert.Same(addedExistingTerritory, employee.Territories.Single(t => t.TerritoryId == "02116")); // Ref equality
Assert.Same(addedNewTerritory, employee.Territories.Single(t => t.TerritoryId == "91360")); // Ref equality
Assert.Same(modifiedTerritory, employee.Territories.Single(t => t.TerritoryId == "01730")); // Ref equality
Assert.DoesNotContain(deletedTerritory, employee.Territories); // Detail deleted
ICollection cachedDeletes = ((ITrackingCollection)employee.Territories).GetChanges(true);
Assert.Empty(cachedDeletes); // Cached deletes have been removed
}
public void GetChanges_On_Existing_Employee_With_Territory_And_Modified_Area_Should_Return_Marked_Territory()
{
// Ensure that changes are retrieved across M-M relationships.
// Arrange
var database = new MockNorthwind();
var employee = database.Employees[0];
var territory = employee.Territories[0];
var area = new Area
{
AreaId = 1,
AreaName = "Northern",
TrackingState = TrackingState.Modified
};
territory.AreaId = 1;
territory.Area = area;
var changeTracker = new ChangeTrackingCollection<Employee>(employee);
area.AreaName = "xxx"; // Modify area
// Act
var changes = changeTracker.GetChanges();
var changedEmployee = changes.First();
var changedTerritory = changedEmployee.Territories.Single(t => t.TerritoryId == territory.TerritoryId);
var changedArea = changedTerritory.Area;
// Assert
Assert.Equal(TrackingState.Unchanged, changedEmployee.TrackingState);
Assert.Equal(TrackingState.Unchanged, changedTerritory.TrackingState);
Assert.Equal(TrackingState.Modified, changedArea.TrackingState);
Assert.Contains("AreaName", area.ModifiedProperties);
}
