How to create an ActiveRecord dynamic creation class during runtime? (ruby)

Object.const_set("Orders", Class.new {def blah() 42 end })

o = Orders.new
o.blah #<== 42

Object. const_set("Orders", Class.new 
Give me a syntax error and

 Object.const_set("Orders", Class.new {def blah() 42 end} 
I won’t complain until I try to instantiate the Orders class
 Is there a tip? 
Thank you.

SomeClass = Class.new(ActiveRecord::Base) do
 .... #some behaviour
end

I am trying metaprogramming and want to dynamically create a class that inherits from ActiveRecord.

For example, I can do this:

Object.const_set("Orders", Class.new {def blah() 42 end })

So now I can:

o = Orders .new
o.blah #<== 42

But when I try:

Object.const_set("Orders", Class. new 
Give me a syntax error and

Object.const_set("Orders", Class.new {def blah() 42 end} 
I won’t complain until I try to instantiate the Orders class
Are there any tips? 
Thank you.

Try this: 

SomeClass = Class.new(ActiveRecord::Base) do
 .... #some behaviour
end