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Generate params hash for Model

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  1. class Object
  2.  
  3.   # provides a params hash which will can useful for testing
  4.   # USAGE : Model.to_params :name_of_params_hash # => :name_of_params_hash defaults to :params
  5.   #         to override the params hash, just pass a hash list of attributes :
  6.   #         Model.to_params.merge(:my_options => "my_value")
  7.   def to_params(params_name="params")
  8.     @@params_var = params_name.to_sym
  9.     attributes = self.new.attributes.keys.map {|c| c.to_sym}
  10.     p_hsh = {}
  11.     attributes.map {|a| p_hsh[a]=nil}
  12.     params = {@@params_var => p_hsh}  
  13.  
  14.     params.instance_eval do
  15.       #overrides Hash#merge method by merging just the sub hash and not the main one
  16.       def merge(options={})
  17.         self[@@params_var].update(options)
  18.         return self
  19.       end
  20.     end
  21.     return params
  22.   end
  23.  
  24. end

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