Question

I have a Rails 3.2 app that manages tasks. Here tasks are being assigned to users. The task model has multiple user variables that are booleans. How would I add a validation to say that at least one user is set to true?

Original:

class Task < ActiveRecord::Base
  attr_accessible :title, :user1, :user2, :user3, :user4:
  validates :title, :presence => true
  validates :is_assigned


  def is_assigned
    if #AT_LEAST_ONE_USER_IS_TRUE
      errors.add("The task must be assigned to at least one user.")
    end
  end

end

Edited:

class Task < ActiveRecord::Base
  attr_accessible :title, :user1, :user2, user3, :user4

  validates :title, :presence => true
  validate :is_assigned

  def is_assigned
    unless @user1 || @user2 || @user3 || @user4
      errors.add(:user1, "The task must be assigned to at least one user.")
    end
  end

end

I’m getting closer I think but this does not work. The error seems to always appear.

Also it looks like errors.add requires another variable. How do I give it all users instead of just user1?

Answer 1

This ended up being my final solution:

class Task < ActiveRecord::Base
  attr_accessible :title, :user1, :user2, user3, :user4

  validates :title, :presence => true
  validate :is_assigned

  def is_assigned
    unless user1 || user2 || user3 || user4
      errors[:base] << "The task must be assigned to at least one user."
    end
  end

end