search for: keywords_control

Hello I have 2 models. link.rb has_many :categories, :as => :categorized validates_presence_of :name, :url, :created_at, :category category.rb belongs_to :categorized, :polymorphic => true validates_presence_of :name Everything seems to work. I select my category from a select tag. The problem is i don''t know how to validate if category is for example empty (nothing in a

problem: validation error is not functionning in callback callback for many-to-many association: # keyword.rb :before_add => :reject_self_related def reject_self_related(related_keyword) if (related_keyword == self) # this does not work: errors.add(:name, "Relating a keyword to itself is forbidden!") raise "Relating a keyword to itself is

What are the limitations on using: errors.add_to_base to display errors in views? I have tried for days to add errors from my object.rb and they never get displayed. class Keyword < ActiveRecord::Base validates_presence_of(:name, :message => "Name is required.") validates_uniqueness_of(:name, :message => "This name is already in use. Please try