diff --git a/app/controllers/admin_controller.rb b/app/controllers/admin_controller.rb
index a8c8b7f..605db95 100644
--- a/app/controllers/admin_controller.rb
+++ b/app/controllers/admin_controller.rb
@@ -8,10 +8,9 @@ def dashboard
   private
 
   def authenticate
-    if Rails.env.production?
-      authenticate_or_request_with_http_basic do |username, password|
-        username == ENV['ADMIN_USERNAME'] && password == ENV['ADMIN_PASSWORD']
-      end
+    return unless Rails.env.production?
+    authenticate_or_request_with_http_basic do |username, password|
+      username == ENV['ADMIN_USERNAME'] && password == ENV['ADMIN_PASSWORD']
     end
   end
 end
diff --git a/app/controllers/questions_controller.rb b/app/controllers/questions_controller.rb
index 21b22b5..803524b 100644
--- a/app/controllers/questions_controller.rb
+++ b/app/controllers/questions_controller.rb
@@ -13,12 +13,9 @@ def create
     @question.save!
 
     params[:options].each do |option|
-      if option[:title] != ''
-        new_option = Option.new
-        new_option.title = option[:title]
-        new_option.question_id = @question.id
-        new_option.save!
-      end
+      next unless option[:title] != ''
+      new_option = Option.new(title: option[:title], question_id: @question.id)
+      new_option.save!
     end
 
     redirect_to "/#{@question.secret}"
@@ -40,7 +37,7 @@ def check_secret_availability
   private
 
   def set_question
-    @question = Question.where(secret: params[:secret]).first
+    @question = Question.find_by_secret!(params[:secret])
   end
 
   def question_params
@@ -48,11 +45,9 @@ def question_params
   end
 
   def check_secret_is_unique
-    if defined? params[:question][:secret]
-      if Question.where({ secret: params[:question][:secret] }).exists?
-        @question = Question.new(question_params)
-        redirect_to :back, notice: 'Sorry that URL is taken'
-      end
-    end
+    return unless defined? params[:question][:secret] &&
+                           Question.where(secret: params[:question][:secret]).exists?
+    @question = Question.new(question_params)
+    redirect_to :back, notice: 'Sorry that URL is taken'
   end
 end
diff --git a/app/controllers/votes_controller.rb b/app/controllers/votes_controller.rb
index c26f685..13945ec 100644
--- a/app/controllers/votes_controller.rb
+++ b/app/controllers/votes_controller.rb
@@ -6,20 +6,20 @@ def update
     vote_id = cookies["vote_#{question_id}"]
     vote = Vote.where(secret: vote_id).first_or_initialize
 
-    question = Question.where(secret: question_id).first
+    question = Question.find_by_secret!(question_id)
     vote.secret = SecureRandom.urlsafe_base64(nil, false) unless vote.secret
     vote.question_id = question.id unless vote.question_id
     vote.option_id = Option.find(params[:vote][:option_id]).id
 
     Pusher[question_id].trigger('vote', {})
 
-    if vote.save!
-      cookies.permanent["vote_#{question.secret}"] = vote.secret
+    return unless vote.save!
 
-      respond_to do |format|
-        format.html { redirect_to "/#{question.secret}" }
-        format.json { render json: {}, status: :created }
-      end
+    cookies.permanent["vote_#{question.secret}"] = vote.secret
+
+    respond_to do |format|
+      format.html { redirect_to "/#{question.secret}" }
+      format.json { render json: {}, status: :created }
     end
   end