Question

I have a class Sample

Sample.class returns

(id :integer, name :String, date :date)

and A hash has all the given attributes as its keys.
Then how can I initialize a variable of Sample without assigning each attribute independently.

Something like

Sample x = Sample.new

x.(attr) = Hash[attr]

How can I iterate through the attributes, the problem is Hash contains keys which are not part of the class attributes too

Answer 1

class Sample
  attr_accessor :id, :name, :date
end

h = {:id => 1, :name => 'foo', :date => 'today', :extra1 => '', :extra2 => ''}

init_hash = h.select{|k,v| Sample.method_defined? "#{k}=" }

# This will work
s = Sample.new
init_hash.each{|k,v| s.send("#{k}=", v)}

# This may work if constructor takes a hash of attributes
s = Sample.new(init_hash)