/// <summary>
/// Adds a root entity to which other entities may be in relationship.
/// </summary>
public void Add(IEntity entity)
{
var ce = ContextEntity.Create <NullRelationship>(entity, NullEntity.Instance);
entities.Add(ce);
ValidateContextDeclaration(entity, () => entities.Remove(ce));
ValidateRelationshipDeclaration <NullRelationship>(entity, NullEntity.Instance, () => entities.Remove(ce));
}
/// <summary>
/// Adds a target entity that has the specified relationship to the source entitiy.
/// </summary>
public void Add <R>(IEntity target, IEntity source) where R : IRelationship
{
ValidateRelationship <R>(target, source);
var ce = ContextEntity.Create <R>(target, source);
entities.Add(ce);
ValidateContextDeclaration(target, () => entities.Remove(ce));
ValidateRelationshipDeclaration <R>(target, source, () => entities.Remove(ce));
}