[Rails] before_validation coding help

I can't get both of these validations to work, I must comment out one
or the other.

before_validation :amazon_ecs_lookup_item, :on => :create
before_validation :amazon_ecs_lookup_item, :on => :update, :if
=> :refresh

in this case only update works

before_validation :amazon_ecs_lookup_item, :on => :create
# before_validation :amazon_ecs_lookup_item, :on => :update, :if
=> :refresh

now create works

I guess you can only code 1 so how do you code it?

before_validation :amazon_ecs_lookup_item, [:on => :create, {:on
=> :update, :if => :refresh}]

doesn't work.

Any ideas?

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