#Fixme

gistfile1.rb

class Post < ActiveRecord::Base
  #Validations
  validates :data, presence: true, length: {in: 6..200}
  validates :source, presence: true, length: {in: 3..200}
  validates :state, presence: true, length: {in: 0..20}
  #Callbacks
  after_save :padded_data
  #Associations
  has_many :subcategories, class_name: 'Category'
  has_one :category, :through => :subcategories
  private
  def padded_data
    #FixME: write logic here
  end
end


class Category < ActiveRecord::Base
  #Validations
  validates :name, presence: true, length: {in: 6..200}
  validates :state, presence: true, length: {in: 0..20}
  #Association
  belongs_to :category
  has_many :subcategories, class_name: 'Category', dependent: :destroy
  has_many :posts
end