In tables "X", "Product" and  "Info"  I have a coloumn named "product_id",
this coloumn in table X is a simple coloumn but in both Product and Info
tables are primary key.
In table X (where product_id is simple) I have:
ManyToOne from X to Product cloumns/refenceColoumn => product_id
=>product_id
ManyToOne from X to Info cloumns/refenceColoumn => product_id =>product_id

I understand when I want to add a new row to table X, first I should call
Product and Info entity by ->find() method as product_id can not be set
simply by:
$this->productId = $blah
nor cannot be null. but if I call these two entities, that would be
duplicate for productId in X entity.
Now my question is that:
Is it safe to have the same property like this as primary key in Product
and Info entities and X entity is mapped to these two as ManyToOne by that
property? Or better to have another coloumn in X table e.g. "something" and
join "something" coloumn to Info entity and product_id coloumn to Product
table, however the value of productId and Something in X table will be
always the same? Please advice if this is better to have a separate coloumn
in X for other two entities or this one I have is ok and I may ignore that
would be a duplicate productId?
I probably have to add that the relationship between Info and Product is
OneToOne as well.
Look forward hearing from you as I am stuck in this.

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