Rails - Aug 2013 - Appropriate method for no-op AR Query chain

With Rails 3, we had a number of method-defined scopes along these lines:

def self.with_name(name)
  if name.present?
    where(name: name)
  else
    scoped
  end
end

In Rails 4, `Model#scoped` is obviously deprecated and recommends replacing 
with `Model#all`. But it looks like `Relation#all` is deprecated as well. 
What''s the "right" way to do this in Rails 4?

Looking at the code and docs, the best approach I''ve found is to use 
`where(nil)` but that doesn''t feel particularly idiomatic. Any better 
approaches?

Thanks much,
Jeremy

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