diff --git a/app/controllers/ci/lints_controller.rb b/app/controllers/ci/lints_controller.rb
index a81e4e319ff..24dd1b5c93a 100644
--- a/app/controllers/ci/lints_controller.rb
+++ b/app/controllers/ci/lints_controller.rb
@@ -18,7 +18,7 @@ module Ci
     rescue Ci::GitlabCiYamlProcessor::ValidationError => e
       @error = e.message
       @status = false
-    rescue Exception => e
+    rescue Exception
       @error = "Undefined error"
       @status = false
     end
diff --git a/app/controllers/omniauth_callbacks_controller.rb b/app/controllers/omniauth_callbacks_controller.rb
index 523264b8ea9..f809fa7500a 100644
--- a/app/controllers/omniauth_callbacks_controller.rb
+++ b/app/controllers/omniauth_callbacks_controller.rb
@@ -71,7 +71,7 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
         redirect_to omniauth_error_path(oauth['provider'], error: error_message) and return
       end
     end
-  rescue Gitlab::OAuth::SignupDisabledError => e
+  rescue Gitlab::OAuth::SignupDisabledError
     label = Gitlab::OAuth::Provider.label_for(oauth['provider'])
     message = "Signing in using your #{label} account without a pre-existing GitLab account is not allowed."
 
@@ -80,7 +80,7 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     end
 
     flash[:notice] = message
-    
+
     redirect_to new_user_session_path
   end
 
diff --git a/app/controllers/projects/wikis_controller.rb b/app/controllers/projects/wikis_controller.rb
index 51c26a6a465..88fccfed509 100644
--- a/app/controllers/projects/wikis_controller.rb
+++ b/app/controllers/projects/wikis_controller.rb
@@ -98,7 +98,7 @@ class Projects::WikisController < Projects::ApplicationController
 
     # Call #wiki to make sure the Wiki Repo is initialized
     @project_wiki.wiki
-  rescue ProjectWiki::CouldNotCreateWikiError => ex
+  rescue ProjectWiki::CouldNotCreateWikiError
     flash[:notice] = "Could not create Wiki Repository at this time. Please try again later."
     redirect_to project_path(@project)
     return false
diff --git a/app/finders/issuable_finder.rb b/app/finders/issuable_finder.rb
index ab89aa2c53a..6aa16673d63 100644
--- a/app/finders/issuable_finder.rb
+++ b/app/finders/issuable_finder.rb
@@ -39,7 +39,7 @@ class IssuableFinder
     items = by_assignee(items)
     items = by_author(items)
     items = by_label(items)
-    items = sort(items)
+    sort(items)
   end
 
   def group
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 39ab83ccf12..3ab44719d9f 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -35,7 +35,7 @@ module ApplicationHelper
   def project_icon(project_id, options = {})
     project =
       if project_id.is_a?(Project)
-        project = project_id
+        project_id
       else
         Project.find_with_namespace(project_id)
       end
diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index 19f957eb965..645ad68e1b3 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -26,7 +26,7 @@
 module Ci
   class Build < ActiveRecord::Base
     extend Ci::Model
-    
+
     LAZY_ATTRIBUTES = ['trace']
 
     belongs_to :commit, class_name: 'Ci::Commit'
@@ -140,7 +140,7 @@ module Ci
 
     def trace_html
       html = Ci::Ansi2html::convert(trace) if trace.present?
-      html ||= ''
+      html || ''
     end
 
     def started?
@@ -211,7 +211,7 @@ module Ci
         if coverage.present?
           coverage.to_f
         end
-      rescue => ex
+      rescue
         # if bad regex or something goes wrong we dont want to interrupt transition
         # so we just silentrly ignore error for now
       end
diff --git a/app/models/ci/project.rb b/app/models/ci/project.rb
index 24f70171094..88ba933a434 100644
--- a/app/models/ci/project.rb
+++ b/app/models/ci/project.rb
@@ -184,7 +184,7 @@ module Ci
 
         # If service is available but missing in db
         # we should create an instance. Ex `create_gitlab_ci_service`
-        service = self.send :"create_#{service_name}_service" if service.nil?
+        self.send :"create_#{service_name}_service" if service.nil?
       end
     end
 
diff --git a/app/models/merge_request_diff.rb b/app/models/merge_request_diff.rb
index f75f999b0d0..c9ef8023aea 100644
--- a/app/models/merge_request_diff.rb
+++ b/app/models/merge_request_diff.rb
@@ -144,12 +144,10 @@ class MergeRequestDiff < ActiveRecord::Base
   # Collect array of Git::Diff objects
   # between target and source branches
   def unmerged_diffs
-    diffs = compare_result.diffs
-    diffs ||= []
-    diffs
-  rescue Gitlab::Git::Diff::TimeoutError => ex
+    compare_result.diffs || []
+  rescue Gitlab::Git::Diff::TimeoutError
     self.state = :timeout
-    diffs = []
+    []
   end
 
   def repository
diff --git a/app/models/project.rb b/app/models/project.rb
index 8527fa29808..06a66bbf494 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -413,7 +413,7 @@ class Project < ActiveRecord::Base
 
         if template.nil?
           # If no template, we should create an instance. Ex `create_gitlab_ci_service`
-          service = self.send :"create_#{service_name}_service"
+          self.send :"create_#{service_name}_service"
         else
           Service.create_from_template(self.id, template)
         end
@@ -738,7 +738,7 @@ class Project < ActiveRecord::Base
   def create_wiki
     ProjectWiki.new(self, self.owner).wiki
     true
-  rescue ProjectWiki::CouldNotCreateWikiError => ex
+  rescue ProjectWiki::CouldNotCreateWikiError
     errors.add(:base, 'Failed create wiki')
     false
   end
diff --git a/app/models/project_services/hipchat_service.rb b/app/models/project_services/hipchat_service.rb
index 7a15a861abc..af2840a57f0 100644
--- a/app/models/project_services/hipchat_service.rb
+++ b/app/models/project_services/hipchat_service.rb
@@ -85,17 +85,16 @@ class HipchatService < Service
   def create_message(data)
     object_kind = data[:object_kind]
 
-    message = \
-      case object_kind
-      when "push", "tag_push"
-        create_push_message(data)
-      when "issue"
-        create_issue_message(data) unless is_update?(data)
-      when "merge_request"
-        create_merge_request_message(data) unless is_update?(data)
-      when "note"
-        create_note_message(data)
-      end
+    case object_kind
+    when "push", "tag_push"
+      create_push_message(data)
+    when "issue"
+      create_issue_message(data) unless is_update?(data)
+    when "merge_request"
+      create_merge_request_message(data) unless is_update?(data)
+    when "note"
+      create_note_message(data)
+    end
   end
 
   def create_push_message(push)
@@ -167,8 +166,6 @@ class HipchatService < Service
     obj_attr = data[:object_attributes]
     obj_attr = HashWithIndifferentAccess.new(obj_attr)
     merge_request_id = obj_attr[:iid]
-    source_branch = obj_attr[:source_branch]
-    target_branch = obj_attr[:target_branch]
     state = obj_attr[:state]
     description = obj_attr[:description]
     title = obj_attr[:title]
@@ -194,8 +191,6 @@ class HipchatService < Service
     data = HashWithIndifferentAccess.new(data)
     user_name = data[:user][:name]
 
-    repo_attr = HashWithIndifferentAccess.new(data[:repository])
-
     obj_attr = HashWithIndifferentAccess.new(data[:object_attributes])
     note = obj_attr[:note]
     note_url = obj_attr[:url]
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 79b48ebfedf..2c5ab62d22c 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -549,7 +549,7 @@ class Repository
 
       # Run GitLab post receive hook
       post_receive_hook = Gitlab::Git::Hook.new('post-receive', path_to_repo)
-      status = post_receive_hook.trigger(gl_id, oldrev, newrev, ref)
+      post_receive_hook.trigger(gl_id, oldrev, newrev, ref)
     else
       # Remove tmp ref and return error to user
       rugged.references.delete(tmp_ref)
diff --git a/app/models/user.rb b/app/models/user.rb
index 9ea7cabff15..ef687f737cc 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -701,13 +701,7 @@ class User < ActiveRecord::Base
   end
 
   def manageable_namespaces
-    @manageable_namespaces ||=
-      begin
-        namespaces = []
-        namespaces << namespace
-        namespaces += owned_groups
-        namespaces += masters_groups
-      end
+    @manageable_namespaces ||= [namespace] + owned_groups + masters_groups
   end
 
   def namespaces
diff --git a/app/services/files/base_service.rb b/app/services/files/base_service.rb
index 7aecee217d8..008833eed80 100644
--- a/app/services/files/base_service.rb
+++ b/app/services/files/base_service.rb
@@ -21,7 +21,7 @@ module Files
         create_target_branch
       end
 
-      if sha = commit
+      if commit
         success
       else
         error("Something went wrong. Your changes were not committed")
diff --git a/app/services/projects/create_service.rb b/app/services/projects/create_service.rb
index e54a13ed6c5..faf1ee008e7 100644
--- a/app/services/projects/create_service.rb
+++ b/app/services/projects/create_service.rb
@@ -62,7 +62,7 @@ module Projects
       after_create_actions if @project.persisted?
 
       @project
-    rescue => ex
+    rescue
       @project.errors.add(:base, "Can't save project. Please try again later")
       @project
     end