ruby on rails - How do I validate one post per day? -

i trying create validation ensure 1 post per day, 24hrs starting 00:00. how can done in rails please?

i did following not sure put today method. simpler alternatives appreciated.

def today   where(:created_at => (time.now.beginning_of_day..time.now)) end

i added validation article model:

validate :time_limit, :on => :create

and defined time_limit in same model so:

def time_limit  if user.articles.today.count >= 1  errors.add(:base, "exceeds daily limit") end

but keep getting "no method" error in create action.

undefined method `today'

i'm not sure put method.

you shoud use scopes that:

class article   scope :today, -> { where(:created_at => (time.now.beginning_of_day..time.now.end_of_day)) } end

Sharma