/// <summary>
/// Retrieves all objects of type U and their retrospective keys whence given the key for type T
/// </summary>
/// <typeparam name="T">The type of the sorce object</typeparam>
/// <typeparam name="U">The type of the related object</typeparam>
/// <param name="store">The underlying store</param>
/// <param name="keyT">The key of the source object</param>
/// <param name="transformer"></param>
/// <returns></returns>
public static IEnumerable <KeyValuePair <string, U> > GetRelatedFor <T, U>(this IKVStore store, Key keyT,
ITypeStringTransformer transformer = null)
{
var tr = transformer ?? new ForeignKeyTypeStringTransformer();
var keys = store.GetRelatedKeysFor <T, U>(keyT);
return(keys.Select(key => new KeyValuePair <string, U>(key, store.Get <U>(key))));
}
/// <summary>
/// Clears all relationships in both directtions between two types of objects connected to the source key.
/// </summary>
/// <typeparam name="T">The type of the sorce object</typeparam>
/// <typeparam name="U">The type of the related object</typeparam>
/// <param name="store">The underlying store</param>
/// <param name="keyT">The key of the source object</param>
/// <param name="transformer"></param>
public static void ClearRelationships <T, U>(this IKVStore store, Key keyT,
ITypeStringTransformer transformer = null)
{
var tr = transformer ?? new ForeignKeyTypeStringTransformer();
var keys = store.GetRelatedKeysFor <T, U>(keyT, tr);
foreach (var keyU in keys)
{
store.RemoveRelationship <T, U>(keyT, keyU, tr);
}
}
public TypesafeKVStore(IKVStore underlyingStore, ITypeStringTransformer generator = null)
: base(underlyingStore)
{
_generator = generator ?? new TypeStringTransformer(null);
}
/// <summary>
/// Gets all the related keys to objects of type U connected to keyT. This can be used in either direction
/// </summary>
/// <typeparam name="T">The type of the sorce object</typeparam>
/// <typeparam name="U">The type of the related object</typeparam>
/// <param name="store">The underlying store</param>
/// <param name="keyT">The key of the source object</param>
/// <param name="transformer"></param>
/// <returns></returns>
public static IEnumerable <string> GetRelatedKeysFor <T, U>(this IKVStore store, Key keyT, ITypeStringTransformer transformer = null)
{
var tr = transformer ?? new ForeignKeyTypeStringTransformer();
return(store.GetCollection <string>(tr.TransformFor <T, U>(keyT)).Distinct());
}
/// <summary>
/// Remove a relationship between two objects. This will remove the keys for each side of the relationship.
/// </summary>
/// <typeparam name="T">The type of the sorce object</typeparam>
/// <typeparam name="U">The type of the related object</typeparam>
/// <param name="store">The underlying store</param>
/// <param name="keyT">The key of the source object</param>
/// <param name="keyU">The key of the related object</param>
/// <param name="transformer"></param>
public static void RemoveRelationship <T, U>(this IKVStore store, Key keyT, Key keyU, ITypeStringTransformer transformer = null)
{
var tr = transformer ?? new ForeignKeyTypeStringTransformer();
store.RemoveFromCollection(tr.TransformFor <T, U>(keyT), keyU.Value);
store.RemoveFromCollection(tr.TransformFor <U, T>(keyU), keyT.Value);
}
