## Mapping strategy

I think we have explored three main options while implementing the association 
mapping in MongoDB

1. Put the assoc info within the entity document we navigate from
2. Put the assoc info in a dedicated document and dedicated collection
3. Put the assoc info in n documents (one doc per row) and a dedicated 
collection

And slightly orthogonal to this, we have considered to use a prefix for the 
association collection to make sure it does not clash when mapping @ManyToOne 
@JoinColumn.

I am reading MongoDB in Action and it seems option 1 is the most natural for 
MongoDB. At least let's offer the option via a property collected by the 
datastore / dialect. We can decide to reduce options down the road we we have a 
better grasp. And that will prevent rewriting the dialect every tie someone 
changes his mind (like me ;P)

## Optimizing what is store

We definitely store the same data over and over (like the table in association 
rows. At some point we probably will want to clean that up to do a more 
"natural" mapping.

(More) thoughts on associations?

Emmanuel

PS: this is nothing new but I'd rather capture this info by mail rather than 
via IRC discussions to consolidate it.
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