ruby on rails - Convert Active Record set into an array of hashes -

I saw this ...

And wanted to make a method Which will allow me to set any scud or non-score record in an array of hashes. I added this to my model:

  def self.to_hash to_a.map (& serializable_hash) end   
 However, I get this error < / P> 
  name: error: 'to_a' method for undefined local variables or #; Class: 0x007fb0da2f2708 & gt;   
 Any ideas?   
 
 
 You may also  all  on  to_a  A scope or current result will work fine on the set (such as  User.active.to_hash ), but not directly on the model (such as  User.to_hash ). Using  all.to_a  will work for both scenarios.  
  def self.to_hash all.to_a.map (& serializable_hash) termination   
 Note that  all.to_a  is slightly narrow Because  all  already gives an array, but in Rail 4 it will be necessary.