My understand is before displaying a picture, you should check the user's
account, if there's no enough money then redirect to some page to show a
notice.
Since users and pictures are n:n relationships, if you want to add a
column to record times each people view the picture, it would be
amount_of_users * amount_of_pics records needed. And I don't think you need
to delete the picture.
before_filter :check_account, :only => :display_pic
def display_pic
# random get pic
end
private
def check_account
redirect_to :some_where if current_user.balance < price_per_pic
end
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