Ruby on Rails - Active Storage - how to accept only pdf and doc?

Question

Is it possible to add a validation to accept only .pdf and .doc files using Active Storage?

Answer 1

Adding a gem for just a few lines of code is not always needed. Here's a working example based on a small alteration on the example above.

validate :logo_content_type, if: -> { logo.attached? }


def logo_content_type
  allowed = %w[image/jpeg image/jpeg image/webp image/png]
  if allowed.exclude?(logo.content_type)
    errors.add(:logo, message: 'Logo must be a JPG, JPEG, WEBP or PNG')
  end
end

Answer 2

there is a gem which provides validation for active storage

gem 'activestorage-validator'

https://github.com/aki77/activestorage-validator

  validates :avatar, presence: true, blob: { content_type: :image }
  validates :photos, presence: true, blob: { content_type: ['image/png', 'image/jpg', 'image/jpeg'], size_range: 1..5.megabytes }