gistfile1.txt

class SomeClass

  def a_field(arg)
    puts "I'm a_field: #{arg}"
  end
  
  def b_field(arg)
    puts "I'm b_field: #{arg}"
  end
  
  def some_other_method
  end

end

list_of_methods = SomeClass.instance_methods.select {|method| method.to_s.include? "_field"}

=> [:a_field, :b_field]

list_of_methods.each do |method|

  SomeClass.new.method(:"#{method}").call("test")
  
end

=> "I'm a_field: test"
=> "I'm b_field: test"