validation - Validate the number of has_many items in Ruby on Rails

Question

Users can add tags to a snippet:

class Snippet < ActiveRecord::Base

  # Relationships
  has_many :taggings
  has_many :tags, :through => :taggings
  belongs_to :closing_reason

end

I want to validate the number of tags: at least 1, at most 6. How am I about to do this? Thanks.

Answer 1

A better solution has been provided by @SooDesuNe on this SO post

validates :tags, length: { minimum: 1, maximum: 6 }