diff --git a/lib/api/helpers.rb b/lib/api/helpers.rb
index 7fada98fcdc..549b1f9e9a7 100644
--- a/lib/api/helpers.rb
+++ b/lib/api/helpers.rb
@@ -63,11 +63,11 @@ module API
           user_project.build_missing_services
 
           service_method = "#{underscored_service}_service"
-          
+
           send_service(service_method)
         end
       end
-   
+
       @project_service || not_found!("Service")
     end
 
@@ -149,7 +149,6 @@ module API
     end
 
     def attributes_for_keys(keys, custom_params = nil)
-      params_hash = custom_params || params
       attrs = {}
       keys.each do |key|
         if params[key].present? or (params.has_key?(key) and params[key] == false)
diff --git a/lib/event_filter.rb b/lib/event_filter.rb
index 163937c02cf..f15b2cfd231 100644
--- a/lib/event_filter.rb
+++ b/lib/event_filter.rb
@@ -47,7 +47,7 @@ class EventFilter
 
     actions << Event::COMMENTED if filter.include? 'comments'
 
-    events = events.where(action: actions)
+    events.where(action: actions)
   end
 
   def options(key)
diff --git a/lib/gitlab/contributions_calendar.rb b/lib/gitlab/contributions_calendar.rb
index 45bb904ed7a..8a7f8dc5003 100644
--- a/lib/gitlab/contributions_calendar.rb
+++ b/lib/gitlab/contributions_calendar.rb
@@ -12,7 +12,6 @@ module Gitlab
 
       @timestamps = {}
       date_from = 1.year.ago
-      date_to = Date.today
 
       events = Event.reorder(nil).contributions.where(author_id: user.id).
         where("created_at > ?", date_from).where(project_id: projects).
diff --git a/lib/gitlab/diff/parser.rb b/lib/gitlab/diff/parser.rb
index c1d9520ddf1..7015fe36c3d 100644
--- a/lib/gitlab/diff/parser.rb
+++ b/lib/gitlab/diff/parser.rb
@@ -14,8 +14,6 @@ module Gitlab
         lines_arr = ::Gitlab::InlineDiff.processing lines
 
         lines_arr.each do |line|
-          raw_line = line.dup
-
           next if filename?(line)
 
           full_line = html_escape(line.gsub(/\n/, ''))
diff --git a/lib/gitlab/fogbugz_import/project_creator.rb b/lib/gitlab/fogbugz_import/project_creator.rb
index f02ea43910f..8b1b6f48ed5 100644
--- a/lib/gitlab/fogbugz_import/project_creator.rb
+++ b/lib/gitlab/fogbugz_import/project_creator.rb
@@ -23,7 +23,7 @@ module Gitlab
           import_url: Project::UNKNOWN_IMPORT_URL
         ).execute
 
-        import_data = project.create_import_data(
+        project.create_import_data(
           data: {
             'repo' => repo.raw_data,
             'user_map' => user_map,
diff --git a/lib/gitlab/google_code_import/project_creator.rb b/lib/gitlab/google_code_import/project_creator.rb
index 0cfeaf9d61c..1cb7d16aeb3 100644
--- a/lib/gitlab/google_code_import/project_creator.rb
+++ b/lib/gitlab/google_code_import/project_creator.rb
@@ -23,7 +23,7 @@ module Gitlab
           import_url: repo.import_url
         ).execute
 
-        import_data = project.create_import_data(
+        project.create_import_data(
           data: {
             "repo"      => repo.raw_data,
             "user_map"  => user_map