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Backport `Fix to working before/after validation callbacks on multipl…
…e contexts.` Though the validation have supported multiple context since rails#21069, its callbacks don't support multiple context currently. So I regarded this as the bug and fixed. Example: ```ruby class Dog include ActiveModel::Validations include ActiveModel::Validations::Callbacks attr_accessor :history def initialize @history = [] end before_validation :set_before_validation_on_a, on: :a before_validation :set_before_validation_on_b, on: :b after_validation :set_after_validation_on_a, on: :a after_validation :set_after_validation_on_b, on: :b def set_before_validation_on_a; history << "before_validation on a"; end def set_before_validation_on_b; history << "before_validation on b"; end def set_after_validation_on_a; history << "after_validation on a" ; end def set_after_validation_on_b; history << "after_validation on b" ; end end ``` Before: ``` d = Dog.new d.valid?([:a, :b]) d.history # [] ``` After: ``` d = Dog.new d.valid?([:a, :b]) d.history # ["before_validation on a", "before_validation on b", "after_validation on a", "after_validation on b"] ```
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