CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3methods
dax
dax

Reputation: 10997

Rails: how to test if parent has grandchildren present in child model

I (want to) have a method in a parent model (groups) to check if a child (subjects) has children (goals)

groups.rb:

def has_goals?
  @answer = []
  subjects = self.subjects
  subjects.each do |subject|
    if subject.try(:goals).present?
      @answer << true
    else
      @answer << false
    end  
  end  
  if @answer.include?("true")
    true
  else
    false
  end
end

I would use this like so -

if group.has_goals?
  # do something
else
  # do something else
end

at the moment it's not working as it's returning false for everything - whether the subject has goals or not. Any ideas how to get this working?

Upvotes: 2

Views: 706

Answers (1)

akhanubis
akhanubis

Reputation: 4232

Check if any of the subjects has at least a goal (subjects.goals should return [] if the subject has no goals):

def has_goals
  subjects.any? { |subject| subject.goals.present? }
end

Enumerable#any? reference: http://ruby-doc.org/core-2.0/Enumerable.html#method-i-any-3F

Upvotes: 4

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