How to conditionally delegate Active Records in Ruby

Question

Is it possible to delegate a function or series of functions to one of multiple other objects based on conditional logic?

Ex:

class Item
    has_one :thing
    has_one :other_thing

    delegate :foo,
             :bar
             to: :[thing or other_thing]
end

In this case, I would want the actions foo and bar to either be delegated to the thing, or the other thing based on some conditional logic.

Possibly related: Active Record with Delegate and conditions

score 5 · Accepted Answer · edited Aug 14 '18 at 15:55

5

Yes.

in addition to other objects, functions can be delegated to other functions.

Ex:

class Item
  has_one :thing
  has_one :other_thing

  delegate :foo,
           :bar
           to: :correct_thing

  def correct_thing
    [conditional] ? thing : other_thing
  end
end

edited Aug 14 '18 at 15:55

Sebastián Palma

32,692
6
40
59

answered Feb 03 '17 at 17:15

ThunderGuppy

189
1
11

score 0 · Answer 2 · edited Aug 14 '18 at 15:54

0

Something like below:

class Item
  has_one :thing
  has_one :other_thing

  delegate :foo,
           :bar
           to: :thing if: thing_condition?

  delegate :foo,
           :bar
           to: :otherthing if: otherthing_condition?
end

edited Aug 14 '18 at 15:54

Sebastián Palma

32,692
6
40
59

answered Feb 03 '17 at 19:59

Sapna Jindal

412
3
11

There's no `if` option for [`delegate`](https://api.rubyonrails.org/classes/Module.html#method-i-delegate) method. – Sebastián Palma Aug 14 '18 at 16:37

How to conditionally delegate Active Records in Ruby

2 Answers2