Hi!

I have the following structure in my application:

Tree embeds_many Leaves
Leaf embeds_one Worm

And I had problems with serialization.

I create a Tree document with 2 Leaves. Each one of those Leaves contains one Worm.
The, I try to convert Tree to Json with to_json and excluding all the _id fields for Tree, Leaves and Worms.

Tree.to_json(:except => :_id,
:include => { :leaves => {:except => :_id,
:include => { :worm => {:except => :_id}
}
}
})

If I serialize Tree before storing it in the database everything works as expected. Cool! The problem is when I retrieve the Tree document from the database (Tree.find(whatever)) and try to serialize it. What I get there is that only the first Worm is serialized without the _id field.

I've created a spec that reproduces the failure.

I've fixed the problem by changing how serialize_relations works. Before the change, it deletes the :inclusion key form the serializable options. This works ok for everything except when we have an embeds_many with an embeds_something, because only the first document of the embeds_many knows that it needs to include something (That's why the second worm does not know anything about removing the _id field).

Am I doing something wrong retrieving the Tree document from the database? Is this fix correct? (All the specs are green after the change, of course )

Thank you!