How to add new attribute to ActiveRecord

Question

After getting all values from model, I want to add another custom attribute to the ActiveRecord class (this attribute is not a column in db) so that I could use it in view, but

Answer 1

I think you mean to assign @test to the ActiveRecord query, correct? Try:

@test = MyARClass.select("*, NULL as newatt")
@test.each {|t| t[:newatt] = some_value}

Another related solution is to make it a singleton class method, though you'd have to jump though more hoops to make it writeable and I intuitively feel like this probably incurs more overhead

@test = MyARClass.all
@test.each do t
  def t.newatt
    some_value
  end
end

Using the second method, of course you'd access it via @test.first.newatt, rather than @test.first[:newatt]. You could try redefining t.[] and t.[]=, but this is starting to get really messy.