skip some validations during creation in rails, but have other validations run

Question

I want to skip the validations of few attributes during creation of a new user like address, pin, phone number etc.
However, it still need to do the other validations in the model when user tries to edit it. I tried using :on => :update but that doesn't help me. Any suggestions ?

My Code:

validates :address, :presence => true, :length => { :maximum => 50 }, :on => :update 
validates :city, :presence => true, :length => { :maximum => 50 }, :on => :update 
validates :state, :presence => true, :length => { :maximum => 50 }, :on => :update 
validates :zip, :presence => true, :numericality => true, :on => :update, :length => { :is => 5 }

Could you post some code that you have tried? That might help us figure out what the problem is. — Justin Herrick
– Justin Herrick, Commented Feb 24, 2012 at 17:43
validates :address, :presence => true, :length => { :maximum => 50 }, :on => :update validates :city, :presence => true, :length => { :maximum => 50 }, :on => :update validates :state, :presence => true, :length => { :maximum => 50 }, :on => :update validates :zip, :presence => true, :numericality => true, :on => :update, :length => { :is => 5 } — Sandeep Rao
– Sandeep Rao, Commented Feb 24, 2012 at 17:46

Justin Herrick · Accepted Answer · 2012-02-24 17:45:13Z

5

According the the documentation, what you need to do is something like this. Are you saying this is not working?

class Person < ActiveRecord::Base
  validates_presence_of :address, :on => :update
  validates_presence_of :pin,     :on => :update
end

answered Feb 24, 2012 at 17:45

Justin Herrick

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Comments

Michael Durrant · Accepted Answer · 2012-02-24 18:28:23Z

4

The validation process on save can be skipped by passing :validate => false.

Note that is there are database constraints you'll still get an error. e.g. if you use a rails migration and have :null => false when it is created (by running the migration) the actual database column will have that restriction be at the database level. A good thing as validations should be in both places. The way to override the db constrainst (i.e. you can't) would be a migration to actually remove the constraint.

answered Feb 24, 2012 at 18:28

Michael Durrant

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3 Comments

Sandeep Rao Over a year ago

@Michale Durrant. By passing false to the save will skip all my validations at creation. I still want to validate few fields during creation.

Michael Durrant Over a year ago

Ahh, yes 'a few' didn't jump out. Let me clarify the question for us, emphasizing that.

Michael Durrant Over a year ago

and to stop a lot more answers that missed it like below too.

Jak · Accepted Answer · 2012-02-24 18:16:20Z

2

On creation of record:

@model = Model.new(params[:model])
@model.save false

This will skip the validation.

answered Feb 24, 2012 at 18:16

Jak

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2 Comments

Sandeep Rao Over a year ago

But I still want to validate some attributes during creation.

Jak Over a year ago

stackoverflow.com/questions/3542819/… this thread will help you.

Sandeep Rao · Accepted Answer · 2012-02-25 03:40:06Z

2

validates :address, :presence => true,
                      :length => { :maximum => 50 },
                      :if => :address_changed?

  validates :city, :presence => true,
                   :length => { :maximum => 50 },
                   :if => :city_changed?

  validates :state, :presence => true,
                    :length => { :maximum => 50 },
                    :if => :state_changed?

  validates :zip,   :presence => true,
                    :numericality => true,
                    :length => { :is => 5 },
                    :if => :zip_changed?

Adding if=> :attribute_changed? will solve the problem.

answered Feb 25, 2012 at 3:40

Sandeep Rao

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