Move the unique post key storage code into the Post model

app/models/post.rb

@@ -70,6 +70,16 @@ class Post < ActiveRecord::Base
     "post-#{user_id}:#{raw_hash}"
   end
 
+  def store_unique_post_key
+    if SiteSetting.unique_posts_mins > 0
+      $redis.setex(unique_post_key, SiteSetting.unique_posts_mins.minutes.to_i, "1")
+    end
+  end
+
+  def matches_recent_post?
+    $redis.exists(unique_post_key)
+  end
+
   def raw_hash
     return if raw.blank?
     Digest::SHA1.hexdigest(raw.gsub(/\s+/, ""))

lib/post_creator.rb

@@ -220,9 +220,7 @@ class PostCreator
   end
 
   def store_unique_post_key
-    if SiteSetting.unique_posts_mins > 0
-      $redis.setex(@post.unique_post_key, SiteSetting.unique_posts_mins.minutes.to_i, "1")
-    end
+    @post.store_unique_post_key
   end
 
   def consider_clearing_flags

lib/validators/post_validator.rb

@@ -64,7 +64,7 @@ class Validators::PostValidator < ActiveModel::Validator
     # If the post is empty, default to the validates_presence_of
     return if post.raw.blank?
 
-    if $redis.exists(post.unique_post_key)
+    if post.matches_recent_post?
       post.errors.add(:raw, I18n.t(:just_posted_that))
     end
   end

spec/components/validators/post_validator_spec.rb

@@ -38,7 +38,7 @@ describe Validators::PostValidator do
 
     context "post is unique" do
       before do
-        $redis.stubs(:exists).with(post.unique_post_key).returns(nil)
+        post.stubs(:matches_recent_post?).returns(false)
       end
 
       it "should not add an error" do
@@ -49,7 +49,7 @@ describe Validators::PostValidator do
 
     context "post is not unique" do
       before do
-        $redis.stubs(:exists).with(post.unique_post_key).returns('1')
+        post.stubs(:matches_recent_post?).returns(true)
       end
 
       it "should add an error" do