CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3ruby-on-rails-3.1
katie
katie

Reputation: 2951

conditional validation in one model but two different forms

I have one model but two different forms ,one form i am saving through create action and another one through student_create action.I want to validate a field in student_create action form and leave other one free.How do i do it?Any help will be appreciated

 class BookController < ApplicationController
     def create
      if @book.save
     redirect_to @book    #eliminated some of the code for simplicity
      end 
     end

     def student_create
     if @book.save            #eliminated some of the code for simplicity
      redirect_to @book
     end
     end

I have tried this but it didnt work

      class Book < ActiveRecord::Base
        validates_presence_of :town ,:if=>:student?

    def student?
    :action=="student_create"
    end
    end

Also this didnt work

      class Book < ActiveRecord::Base
        validates_presence_of :town ,:on=>:student_create
       end

Upvotes: 1

Views: 428

Answers (3)

drhenner
drhenner

Reputation: 2230

Sounds like you have two types of books. not sure what your domain logic is but the normal flow I would do nothing. 

class Book < ActiveRecord::Base

end

Then for the path you want an extra validation you could do this:

class SpecialBook < Book
  validates :town, :presence => true
end

If this is the case you might want to consider Single Table Inheritance.

In another case you might want to save the student_id on the book.

Then

class Book < ActiveRecord::Base
  validate :validate_town

  private
    def validate_town
      if student_id
        self.errors.add(:town, "This book is evil, it needs a town.") if town.blank?
      end
    end
end

Upvotes: 0

katie
katie

Reputation: 2951

I was able to acomplish it what i wanted to do by giving it an option :allow_nil=>true

Upvotes: 0

davidb
davidb

Reputation: 8954

In the one that should not be validated you do this:

@object = Model.new(params[:xyz])

respond_to do |format|
     if @object.save(:validate => false)
          #do stuff here
     else
          #do stuff here
     end
end

the save(:validate => false) will skipp the validation.

Upvotes: 2

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