Rails - May 2013 - How to pass more than one argument to Rails validation hooks?

I don''t know how to pass many arguments to before_validation hook. I
want to implement the hook on both create and update methods:

  before_validation(:on => [:create, :update]) {
    // do something
  }
But this form of arguments :on => [:create, :update] throws an error:

/active_support/callbacks.rb:403: syntax error, unexpected
''['',
expecting tSTRING_CONTENT or tSTRING_DBEG or tSTRING_DVAR or tSTRING_END
... (self.validation_context == :[:create, :update])


This one :on => :create, :update also doesn''t work:

syntax error, unexpected '')'', expecting tASSOC
before_validation(:on => :create, :update) {


And API has only one example with one argument:

before_validation(:on => :create) do
  self.number = number.gsub(/[^0-9]/, "") if
attribute_present?("number")
end

How to pass multiple arguments?

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Per this: 
http://guides.rubyonrails.org/active_record_validations_callbacks.html#available-callbacks

before_validation only occurs/runs on create and update

try this:
before_validation do |object_name|
   #some code
end 

On Thursday, May 30, 2013 11:55:53 AM UTC-4, Ruby-Forum.com User
wrote:
>
> I don''t know how to pass many arguments to before_validation hook.
I
> want to implement the hook on both create and update methods: 
>
>   before_validation(:on => [:create, :update]) { 
>     // do something 
>   } 
> But this form of arguments :on => [:create, :update] throws an error: 
>
> /active_support/callbacks.rb:403: syntax error, unexpected
''['',
> expecting tSTRING_CONTENT or tSTRING_DBEG or tSTRING_DVAR or tSTRING_END 
> ... (self.validation_context == :[:create, :update]) 
>
>
> This one :on => :create, :update also doesn''t work: 
>
> syntax error, unexpected '')'', expecting tASSOC 
> before_validation(:on => :create, :update) { 
>
>
> And API has only one example with one argument: 
>
> before_validation(:on => :create) do 
>   self.number = number.gsub(/[^0-9]/, "") if 
> attribute_present?("number") 
> end 
>
> How to pass multiple arguments? 
>
> -- 
> Posted via http://www.ruby-forum.com/. 
>
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Rafael wrote in post #1110688:
> Per this:
> 
http://guides.rubyonrails.org/active_record_validations_callbacks.html#available-callbacks
>
> before_validation only occurs/runs on create and update
>
Thank you. I found an explanation. Just to pass :on => save will include 
both:

class Person < ActiveRecord::Base
  # it will be possible to update email with a duplicated value
  validates :email, :uniqueness => true, :on => :create

  # it will be possible to create the record with a non-numerical age
  validates :age, :numericality => true, :on => :update

  # the default (validates on both create and update)
  validates :name, :presence => true, :on => :save
end

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