private static EntityNavigationProperty CreateNavigationProperty(INavigation navigation)
{
var isCollection = navigation.IsCollection();
var isRequired = navigation.ForeignKey.IsRequired;
var navigationProperty = new EntityNavigationProperty(navigation.Name, isCollection ? navigation.ClrType.GetItemType() : navigation.ClrType, isCollection, !isRequired);
if (!isCollection)
{
var properties = navigation.ForeignKey.Properties;
navigationProperty.DependentPropertyNames = properties.Select(p => p.Name).ToArray();
}
return(navigationProperty);
}
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
JsonProperty property = base.CreateProperty(member, memberSerialization);
property.ShouldSerialize =
instance =>
{
var entity = instance as ITrackable;
if (entity == null)
{
return(true);
}
EntityNavigationProperty np = entity
.GetNavigationProperties(false)
.FirstOrDefault(x => x.Property == member);
if (np == null)
{
return(true); // not a nav prop
}
if (np.ValueIsNull)
{
return(false); // nav prop is not initialized
}
foreach (var rp in np.AsReferenceProperty())
{
// don't serialize unchanged reference navigation props
return(IncludeReferenceProp(entity, rp.Property));
}
// serialize collection navigation props
return(true);
};
// Inject the custom IValueProvider for entity collections which
// returns only changed items
property.ValueProvider = new CollectionValueProvider(this, member, property.ValueProvider);
return(property);
}
private static void ApplyChangesOnCollectionProperties(TrackingState stateFilter, bool includeState,
EntityNavigationProperty navProp, EntityCollectionProperty <IList> colProp,
DbContext context, ITrackable item, ObjectVisitationHelper visitationHelper, TrackingState?state = null)
{
// Apply changes to 1-M and M-M properties filtering by tracking state
var count = colProp.EntityCollection.Count;
for (int i = count - 1; i > -1; i--)
{
var trackableChild = colProp.EntityCollection[i] as ITrackable;
if (trackableChild != null)
{
bool condition = includeState
? trackableChild.TrackingState == stateFilter
: trackableChild.TrackingState != stateFilter;
if (condition)
{
context.ApplyChanges(trackableChild, item, visitationHelper, navProp.Property.Name, state);
}
}
}
}
