--- a/app/controllers/pastes_controller.rb	Sat Jun 06 22:01:08 2015 +0900
+++ b/app/controllers/pastes_controller.rb	Sat Jun 06 22:12:56 2015 +0900
@@ -28,28 +28,23 @@
   # POST /pastes.json
   # POST /pastes.txt
   def create
-    @paste = Paste.new paste_params.merge(:ip => request.remote_ip)
+    created, @paste, @fresh = Paste.graceful_create paste_params.merge(:ip => request.remote_ip)
 
-    begin
-      respond_to do |format|
-        if @paste.save
-          @fresh = true
+    respond_to do |format|
+      if created
+        if @fresh
           format.html { redirect_to @paste, :notice => "Paste was successfully created." }
           format.json { render :json => @paste, :status => :created, :location => @paste }
         else
-          flash.now[:alert] = @paste.errors.full_messages.to_sentence
-          format.html { render :action => "new" }
-          format.json { render :json => @paste.errors, :status => :unprocessable_entity }
+          format.html { redirect_to paste_path(@paste) }
+          format.json { render :json => @paste }
         end
-        format.txt
+      else
+        flash.now[:alert] = @paste.errors.full_messages.to_sentence
+        format.html { render :action => "new" }
+        format.json { render :json => @paste.errors, :status => :unprocessable_entity }
       end
-    rescue ActiveRecord::RecordNotUnique
-      @paste = Paste.where(:ip => @paste.ip, :paste_hash => @paste.paste_hash).first
-      respond_to do |format|
-        format.html { redirect_to paste_path(@paste) }
-        format.json { render :json => @paste }
-        format.txt
-      end
+      format.txt
     end
   end
 

--- a/app/models/paste.rb	Sat Jun 06 22:01:08 2015 +0900
+++ b/app/models/paste.rb	Sat Jun 06 22:12:56 2015 +0900
@@ -22,6 +22,21 @@
     end
   end
 
+  def self.graceful_create(params)
+    paste = self.new(params)
+    fresh = true
+    created = true
+
+    begin
+      created = paste.save
+    rescue ActiveRecord::RecordNotUnique
+      paste = self.find_by(:ip => paste.ip, :paste_hash => paste.paste_hash)
+      fresh = false
+    end
+
+    return [created, paste, fresh]
+  end
+
   def paste_gzip=(paste)
     self.paste = ActiveSupport::Gzip.decompress paste
   end