CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-5
Huy Vo
Huy Vo

Reputation: 2500

How to avoid create some attribute in controller's create method?

I have a model like this:

class Url < ApplicationRecord
  validates ...
  before_create :generate_number

  def generate_number
    self.number = a random value
  end
end

and a create() method in controller:

def create
  @url = Url.new(url_params)

  respond_to do |format|
    if @url.save
      format.html { redirect_to @url, notice: 'Url was successfully created.' }
      format.json { render :show, status: :created, location: @url }
    else
      format.html { render :new }
      format.json { render json: @url.errors, status: :unprocessable_entity }
    end
  end
end

My DB only have two fields: given_url and number. Now, when I go to the new page, there's 2 input form for given_url and number. But I want number take the value from generate_number, not from the form. How can I do that?

Or more specific, is there a way to make the generate_number method to overrides user's input after the app already receive value from user's input?

Upvotes: 1

Views: 60

Answers (2)

Deepak Mahakale
Deepak Mahakale

Reputation: 23661

You can simply restrict the input from user by using strong params

def url_params
  params.require(:url).permit(:other, :params)
end

Upvotes: 1

Huy Vo
Huy Vo

Reputation: 2500

Well, I have found a way to fix this. As @ts mentioned in the question's comment, I changed before_create :generate_number to after_create :generate_number and added self.save to the end of generate_number method:

def generate_number
  ...
  self.number = some number
  self.save
end

Upvotes: 1

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