ruby on rails - Pass arguments in scope -

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can provide example on how use 

scope

and parameters?

for example:

class permission < activerecord::base   scope :default_permissions, :conditions => { :is_default => true } end

i have code returns default_permissions , want convert return default permissions given user (user_id)

thanks

new syntax (ruby 1.9+), prevent errors if don't supply user - 

scope :default_permissions_for, ->(user = nil) { ... }

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