persistence

[dcdieci]

Great lib!
Is there any way to persist a rule in a database?

[ulfurinn]

It's up to you how you want to do it.

[dcdieci]

I don't quite get it.
For instance how would it be possible to store and load such a rule

`harry = {}
  engine << [harry, "wizard", true]
  engine << [harry, "muggle", true]
  engine << [harry, "potions_grade", 2]
  engine << [harry, "spells_grade", 2]

  advance_grade = engine.rule "advanced to second grade?" do
    forall {
      has :Student, "wizard", true
      has :Student, "muggle", true
      maybe :Student, "potions_grade", :Potions_grade
      maybe :Student, "spells_grade", :Spells_grade
      assert do |token|
        token[:Potions_grade] < 3 && token[:Spells_grade] < 3
      end

      assert do |token|
        token[:Potions_grade] >= 2
      end
      make {
        action { |token|
          p "passed"
        }
      }
    }
  end`

thanks for the swift reply
edit:
e.g. Marshal.dump is not possible due to the used Proc

[ulfurinn]

Procs cannot be persisted, of course. They are not marshalable in Ruby.

[ulfurinn]

Unless you store the AST and generate code with ruby2ruby or something like that.

[dcdieci]

Procs cannot be persisted, of course. They are not marshalable in Ruby.

exactly.
So I am wondering how I could do it?

[ulfurinn]

I don't know. Look into sexpr and such.