Refactored Topic#limit_topics_per_day to reduce code climate complexity

Extracted  1) #apply_per_day_rate_limit_for, method as generic
RateLimiter , 2) #limit_first_day_topics_per_day as a separate method,
3) Added User#added_a_day_ago?, 4) Fixed private methods indentation.

app/models/topic.rb

@@ -182,15 +182,13 @@ class Topic < ActiveRecord::Base
 
   # Additional rate limits on topics: per day and private messages per day
   def limit_topics_per_day
-    RateLimiter.new(user, "topics-per-day:#{Date.today.to_s}", SiteSetting.max_topics_per_day, 1.day.to_i)
-    if user.created_at > 1.day.ago
-      RateLimiter.new(user, "first-day-topics-per-day:#{Date.today.to_s}", SiteSetting.max_topics_in_first_day, 1.day.to_i)
-    end
+    apply_per_day_rate_limit_for("topics", :max_topics_per_day)
+    limit_first_day_topics_per_day if user.added_a_day_ago?
   end
 
   def limit_private_messages_per_day
     return unless private_message?
-    RateLimiter.new(user, "pms-per-day:#{Date.today.to_s}", SiteSetting.max_private_messages_per_day, 1.day.to_i)
+    apply_per_day_rate_limit_for("pms", :max_private_messages_per_day)
   end
 
   def fancy_title
@@ -325,9 +323,7 @@ class Topic < ActiveRecord::Base
   end
 
   def changed_to_category(cat)
-
-    return true if cat.blank?
-    return true if Category.where(topic_id: id).first.present?
+    return true if cat.blank? || Category.where(topic_id: id).first.present?
 
     Topic.transaction do
       old_category = category
@@ -621,6 +617,14 @@ class Topic < ActiveRecord::Base
     end
   end
 
+  def limit_first_day_topics_per_day
+    apply_per_day_rate_limit_for("first-day-topics", :max_topics_in_first_day)
+  end
+
+  def apply_per_day_rate_limit_for(key, method_name)
+    RateLimiter.new(user, "#{key}-per-day:#{Date.today.to_s}", SiteSetting.send(method_name), 1.day.to_i)
+  end
+
 end
 
 # == Schema Information

app/models/user.rb

@@ -467,6 +467,10 @@ class User < ActiveRecord::Base
     uploaded_avatar.present?
   end
 
+  def added_a_day_ago?
+    created_at > 1.day.ago
+  end
+
   protected
 
   def cook

spec/models/user_spec.rb

@@ -822,4 +822,23 @@ describe User do
       end
     end
   end
+
+  describe "#added_a_day_ago?" do
+    context "when user is more than a day old" do
+      subject(:user) { Fabricate(:user, created_at: Date.today - 2.days) }
+
+      it "returns false" do
+        expect(user).to_not be_added_a_day_ago
+      end
+    end
+
+    context "is less than a day old" do
+      subject(:user) { Fabricate(:user) }
+
+      it "returns true" do
+        expect(user).to be_added_a_day_ago
+      end
+    end
+
+  end
 end