Support for multiple relations on the same entity

[wtfuii]

This could be either classified as a bug or a missing feature:

Given the following Relationships:

One "Person" has Many "Friends".
One "Person" has Many "Kids".
One "Kid" has one "Godparent" - "Godparent" being a foreign key relationship to a row in the "Friends" table.

If a "Person" is getting cloned including its relationships, the "Friends" who are also "Godparents" in of a "Kid" will be duplicated in the "Friends" table.

Solution:

1. Save every copied entity in a dictionary, having the original ID and type as key.
2. Whenever a related entity is being set in the graph, check if the dictionary contains an instance with the original key.
3. If it does not, reset the instance and add it to the dictionary.
4. Set the relationship using the instance from the dictionary.

Those steps make sure, that all relationships are using the same instance of entities with a specific key.

[HenkKin]

Currently the originals and the copies are stored in a lDictionary. But if the original object does not have the same instance, then they will be duplicated. I think if you use EF with AsNoTracking then they are already different instances. I will have a look if changing key to primary key instead of instance will solve this.

[HenkKin]

@wtfuii I created a pull request #22. Please have a look at it.

[HenkKin]

@wtfuii are you able to have a look at it, Is this the solution for your issue?