Cheet shet or overview of visibility between modal, views, a

Where is an overview of who can see what and how ?

session[] and params[] seem to be global, but what about instance
variables of the controller? The views seem to be able to see (and
modify) them.

components seems to be able to set instance variables that their
controllers can see; likewise partials can set values that the template
and layout can see.

I’m getting all the Rails books I can, so a page reference to one of
them will suffice.

Cheers

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