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# in user model
def display_city
  city.capitalize if city
end

# in helper
def blank_not_specified(value) # you can probably come up with a better name for this.
  value.blank? ? "Not Specified" : value
end

# in view
<%= blank_not_specified @user.display_city %>

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# in User model

def pretty_city
  city.blank? ? 'Not specified' : city.capitalize
end

# in your views

<%= @user.pretty_city %>

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class User < ActiveRecord::Base

   def display_city
      return self.city.blank? ? 'Not Specified' : self.city
   end

end


<%= @user.display_city %>

<%# Or Without Editing Your Model %>
<%= @user.city.blank? ? 'Not Specified' : @user.city %>

Helper

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module ApplicationHelper
  def present(object)
    object.class.const_get("Presenter").new(object)
  end
end

Presenter

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class User::Presenter < Struct.new(:user)
  def city
    user.city.blank? ? "Not specified" : user.city.capitalize
  end
  
  def method_missing(method, *args, &block)
    user.send(method, *args, &block)
  end
end

View

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<%= present(@user).city %>

View

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<%= !@user.city.blank? && @user.city || "Not specified" %>