Rails date validation with conditional validation if and future? method

Question

I found a few duplicate Q&As; however, I did not figure it out.

I have House model which has :available_at validation (The field is Date). I'm trying to achieve something like this.

The availability date must be in future.

# db/schema.rb
create_table "houses", force: :cascade do |t|
  # ...
  t.date "available_at", null: false
  # ...
end

# app/models/house.rb
class House < ApplicationRecord
  validates :available_at, presence: true, if: -> { available_at.future? }
end

Also, here is the PR

Duplicate answers
Conditional Validation RAILS MODEL
Conditional validation if another validation is valid
Rails validate uniqueness only if conditional
rails date validation with age
How do I validate a date in rails?
https://codereview.stackexchange.com/questions/110262/checking-for-valid-date-range-in-rails

Community · Accepted Answer · 2022-11-01 18:07:08Z

Thank you for Mark Merritt because I inspired his answer. The answer works as expected, but the problem is keeping the model DRY, and also, it has a long method name.

I created separate validator which is name at_future_validator.rb. I placed the file inside of lib/validators folder.

Then, I wrote this validator

# lib/validators/at_future_validator.rb
class AtFutureValidator < ActiveModel::EachValidator
  def validate_each(object, attribute, value)
    if attribute.present? && value < Date.today
      object.errors[attribute] << (options[:message] || 'must be in the future')
    end
  end
end

OK. The first part has done. The important part is, which I saw now on the guide, working with custom validator which we named at_future_validator. We need to require the validator inside of the house model.

# app/models/house.rb
class House < ApplicationRecord
  require_dependency 'validators/at_future_validator'
  # ...
  validates :available_at, presence: true, at_future: true
  # ...
end

Guides that I followed
#211 Validations in Rails 3 - 8:09

Mark Merritt · Accepted Answer · 2018-08-23 19:14:57Z

0

This seems like a good use case for a custom method that validates available_at...

class House < ApplicationRecord
  validate :available_at_is_in_the_future

  def available_at_is_in_the_future
    if available_at.present? && available_at <= Date.today
      errors.add(:available_at, "must be in the future")
    end
  end
end

edited Aug 23, 2018 at 19:14

answered Aug 23, 2018 at 19:07

Mark Merritt

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3 Comments

Berkhan Berkdemir Over a year ago

Thank you for your answer. For now, it works like charm, but I need to update RSpecs. After that I will mark as answer.

Berkhan Berkdemir Over a year ago

Thank you Mark. I added my answer. You can check it out!

Berkhan Berkdemir Over a year ago

Yes, you are right, but the point is that model should do model's job.

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