Advanced Routing in Rails - Daniel Phillips

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Why do we namespace things?

We namespace when we want to separate the available functionality for a certain type of User on an app, or when we don't want
to repeate information that isn't pertinent to every user on certain pages.

What is the difference between namespacing and scoping?

scoping allows use to define the module, as well as the prefix assignment, while namespacing assumes we want 
those elements be the same. 

When would we use one over the other?

  if we wanted to be explicit with the route prefix for a certain purpose, we would scope; otherwise, we would use namespacing. 
  
When should you use nested resources?

  When we want a resource to have access to to the dynamic properties of a top-level resource.