Adding post details in preparation for the API importer code.

app/models/post.rb

@@ -34,6 +34,8 @@ class Post < ActiveRecord::Base
 
   has_one :post_search_data
 
+  has_many :post_details
+
   validates_with ::Validators::PostValidator
 
   # We can pass several creating options to a post via attributes
@@ -56,6 +58,17 @@ class Post < ActiveRecord::Base
     @types ||= Enum.new(:regular, :moderator_action)
   end
 
+  def self.find_by_detail(key, value)
+    includes(:post_details).where( "post_details.key = ? AND " +
+                                   "post_details.value = ?",
+                                   key,
+                                   value ).first
+  end
+
+  def add_detail(key, value, extra = nil)
+    post_details.build(key: key, value: value, extra: extra)
+  end
+
   def limit_posts_per_day
     if user.created_at > 1.day.ago && post_number > 1
       RateLimiter.new(user, "first-day-replies-per-day:#{Date.today.to_s}", SiteSetting.max_replies_in_first_day, 1.day.to_i)

app/models/post_detail.rb

@@ -0,0 +1,6 @@
+class PostDetail < ActiveRecord::Base
+  belongs_to :post
+
+  validates_presence_of   :key, :value
+  validates_uniqueness_of :key, scope: :post_id
+end