diff --git a/config/environments/production.rb b/config/environments/production.rb
index 30239671c08..ed2d885b063 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -42,7 +42,7 @@ Rails.application.configure do
   config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
 
   # Allow to specify public IP of reverse proxy if it's needed
-  config.action_dispatch.trusted_proxies = ENV['TRUSTED_PROXY_IP'].split.map { |item| IPAddr.new(item) } unless ENV['TRUSTED_PROXY_IP'].blank?
+  config.action_dispatch.trusted_proxies = ENV['TRUSTED_PROXY_IP'].split.map { |item| IPAddr.new(item) } if ENV['TRUSTED_PROXY_IP'].present?
 
   # Use the lowest log level to ensure availability of diagnostic information
   # when problems arise.
diff --git a/config/initializers/http_client_proxy.rb b/config/initializers/http_client_proxy.rb
index e607aff3c40..9d7b16e69c8 100644
--- a/config/initializers/http_client_proxy.rb
+++ b/config/initializers/http_client_proxy.rb
@@ -6,7 +6,7 @@ Rails.application.configure do
     raise "No proxy host" unless proxy.host
 
     host = proxy.host
-    host = host[1...-1] if host[0] == '[' #for IPv6 address
+    host = host[1...-1] if host[0] == '[' # for IPv6 address
     config.x.http_client_proxy[:proxy] = { proxy_address: host, proxy_port: proxy.port, proxy_username: proxy.user, proxy_password: proxy.password }.compact
   end
 
diff --git a/config/initializers/omniauth.rb b/config/initializers/omniauth.rb
index 21b58eb5b31..254e751d42e 100644
--- a/config/initializers/omniauth.rb
+++ b/config/initializers/omniauth.rb
@@ -3,7 +3,7 @@ Rails.application.config.middleware.use OmniAuth::Builder do
 end
 
 Devise.setup do |config|
-  # Devise omniauth strategies
+  # Devise omniauth strategies
   options = {}
   options[:redirect_at_sign_in] = ENV['OAUTH_REDIRECT_AT_SIGN_IN'] == 'true'
 
diff --git a/config/initializers/open_uri_redirection.rb b/config/initializers/open_uri_redirection.rb
index e24fdecabc0..ea2dcffea29 100644
--- a/config/initializers/open_uri_redirection.rb
+++ b/config/initializers/open_uri_redirection.rb
@@ -1,7 +1,7 @@
 require 'open-uri'
 
 module OpenURI
-  def OpenURI.redirectable?(uri1, uri2) # :nodoc:
+  def self.redirectable?(uri1, uri2) # :nodoc:
     uri1.scheme.downcase == uri2.scheme.downcase ||
       (/\A(?:http|https|ftp)\z/i =~ uri1.scheme && /\A(?:http|https|ftp)\z/i =~ uri2.scheme)
   end
diff --git a/config/initializers/rack_attack.rb b/config/initializers/rack_attack.rb
index 0ca0a7e7fd5..8756b8fbf0e 100644
--- a/config/initializers/rack_attack.rb
+++ b/config/initializers/rack_attack.rb
@@ -42,7 +42,7 @@ class Rack::Attack
   # (blocklist & throttles are skipped)
   Rack::Attack.safelist('allow from localhost') do |req|
     # Requests are allowed if the return value is truthy
-    '127.0.0.1' == req.ip || '::1' == req.ip
+    req.ip == '127.0.0.1' || req.ip == '::1'
   end
 
   throttle('throttle_authenticated_api', limit: 300, period: 5.minutes) do |req|
diff --git a/config/initializers/sidekiq.rb b/config/initializers/sidekiq.rb
index 05c80410056..7f8a40d7ba7 100644
--- a/config/initializers/sidekiq.rb
+++ b/config/initializers/sidekiq.rb
@@ -19,4 +19,4 @@ Sidekiq.configure_client do |config|
   config.redis = redis_params
 end
 
-Sidekiq::Logging.logger.level = ::Logger::const_get(ENV.fetch('RAILS_LOG_LEVEL', 'info').upcase.to_s)
+Sidekiq::Logging.logger.level = ::Logger.const_get(ENV.fetch('RAILS_LOG_LEVEL', 'info').upcase.to_s)
diff --git a/config/puma.rb b/config/puma.rb
index 0397b892048..5ebf5ed192a 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -1,7 +1,7 @@
 threads_count = ENV.fetch('MAX_THREADS') { 5 }.to_i
 threads threads_count, threads_count
 
-if ENV['SOCKET'] then
+if ENV['SOCKET']
   bind 'unix://' + ENV['SOCKET']
 else
   port ENV.fetch('PORT') { 3000 }
diff --git a/db/migrate/20160314164231_add_owner_to_application.rb b/db/migrate/20160314164231_add_owner_to_application.rb
index 1919f09a170..553c18b5ebe 100644
--- a/db/migrate/20160314164231_add_owner_to_application.rb
+++ b/db/migrate/20160314164231_add_owner_to_application.rb
@@ -4,4 +4,4 @@ class AddOwnerToApplication < ActiveRecord::Migration[4.2]
     add_column :oauth_applications, :owner_type, :string, null: true
     add_index :oauth_applications, [:owner_id, :owner_type]
   end
-end
\ No newline at end of file
+end
diff --git a/db/migrate/20170105224407_add_shortcode_to_media_attachments.rb b/db/migrate/20170105224407_add_shortcode_to_media_attachments.rb
index 2685ae150ec..fba46a4b63b 100644
--- a/db/migrate/20170105224407_add_shortcode_to_media_attachments.rb
+++ b/db/migrate/20170105224407_add_shortcode_to_media_attachments.rb
@@ -8,7 +8,7 @@ class AddShortcodeToMediaAttachments < ActiveRecord::Migration[5.0]
   end
 
   def down
-  	remove_index :media_attachments, :shortcode
-  	remove_column :media_attachments, :shortcode
+    remove_index :media_attachments, :shortcode
+    remove_column :media_attachments, :shortcode
   end
 end
diff --git a/spec/controllers/admin/statuses_controller_spec.rb b/spec/controllers/admin/statuses_controller_spec.rb
index 6afcc144257..1a08c10b7e8 100644
--- a/spec/controllers/admin/statuses_controller_spec.rb
+++ b/spec/controllers/admin/statuses_controller_spec.rb
@@ -24,7 +24,7 @@ describe Admin::StatusesController do
     end
 
     it 'returns http success with media' do
-      get :index, params: { account_id: account.id , media: true }
+      get :index, params: { account_id: account.id, media: true }
 
       statuses = assigns(:statuses).to_a
       expect(statuses.size).to eq 1
diff --git a/spec/controllers/concerns/export_controller_concern_spec.rb b/spec/controllers/concerns/export_controller_concern_spec.rb
index 6a13db69d65..e5861c801f5 100644
--- a/spec/controllers/concerns/export_controller_concern_spec.rb
+++ b/spec/controllers/concerns/export_controller_concern_spec.rb
@@ -8,6 +8,7 @@ describe ApplicationController, type: :controller do
     def index
       send_export_file
     end
+
     def export_data
       @export.account.username
     end
diff --git a/spec/controllers/settings/applications_controller_spec.rb b/spec/controllers/settings/applications_controller_spec.rb
index fd4b1007175..29c27814846 100644
--- a/spec/controllers/settings/applications_controller_spec.rb
+++ b/spec/controllers/settings/applications_controller_spec.rb
@@ -47,13 +47,13 @@ describe Settings::ApplicationsController do
     context 'success (passed scopes as a String)' do
       def call_create
         post :create, params: {
-               doorkeeper_application: {
-                 name: 'My New App',
-                 redirect_uri: 'urn:ietf:wg:oauth:2.0:oob',
-                 website: 'http://google.com',
-                 scopes: 'read write follow'
-               }
-             }
+          doorkeeper_application: {
+            name: 'My New App',
+            redirect_uri: 'urn:ietf:wg:oauth:2.0:oob',
+            website: 'http://google.com',
+            scopes: 'read write follow'
+          }
+        }
         response
       end
 
@@ -69,13 +69,13 @@ describe Settings::ApplicationsController do
     context 'success (passed scopes as an Array)' do
       def call_create
         post :create, params: {
-               doorkeeper_application: {
-                 name: 'My New App',
-                 redirect_uri: 'urn:ietf:wg:oauth:2.0:oob',
-                 website: 'http://google.com',
-                 scopes: [ 'read', 'write', 'follow' ]
-               }
-             }
+          doorkeeper_application: {
+            name: 'My New App',
+            redirect_uri: 'urn:ietf:wg:oauth:2.0:oob',
+            website: 'http://google.com',
+            scopes: [ 'read', 'write', 'follow' ]
+          }
+        }
         response
       end
 
@@ -91,13 +91,13 @@ describe Settings::ApplicationsController do
     context 'failure' do
       before do
         post :create, params: {
-               doorkeeper_application: {
-                 name: '',
-                 redirect_uri: '',
-                 website: '',
-                 scopes: []
-               }
-             }
+          doorkeeper_application: {
+            name: '',
+            redirect_uri: '',
+            website: '',
+            scopes: []
+          }
+        }
       end
 
       it 'returns http success' do
@@ -120,9 +120,9 @@ describe Settings::ApplicationsController do
 
       def call_update
         patch :update, params: {
-                id: app.id,
-                doorkeeper_application: opts
-              }
+          id: app.id,
+          doorkeeper_application: opts
+        }
         response
       end
 
@@ -139,14 +139,14 @@ describe Settings::ApplicationsController do
     context 'failure' do
       before do
         patch :update, params: {
-                id: app.id,
-                doorkeeper_application: {
-                  name: '',
-                  redirect_uri: '',
-                  website: '',
-                  scopes: []
-                }
-              }
+          id: app.id,
+          doorkeeper_application: {
+            name: '',
+            redirect_uri: '',
+            website: '',
+            scopes: []
+          }
+        }
       end
 
       it 'returns http success' do
diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
index ae19251ae9d..60d13d32e90 100644
--- a/spec/models/account_spec.rb
+++ b/spec/models/account_spec.rb
@@ -275,7 +275,7 @@ RSpec.describe Account, type: :model do
 
     subject { Fabricate(:account) }
 
-    context 'when the status is a reblog of another status'do
+    context 'when the status is a reblog of another status' do
       let(:original_reblog) do
         author = Fabricate(:account, username: 'original_reblogger')
         Fabricate(:status, reblog: original_status, account: author)
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 015e90edcde..42198cb4d62 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -254,7 +254,7 @@ RSpec.describe User, type: :model do
 
   it_behaves_like 'Settings-extended' do
     def create!
-      User.create!(account: Fabricate(:account), email: 'foo@mastodon.space', password: 'abcd1234' )
+      User.create!(account: Fabricate(:account), email: 'foo@mastodon.space', password: 'abcd1234')
     end
 
     def fabricate
diff --git a/spec/views/stream_entries/show.html.haml_spec.rb b/spec/views/stream_entries/show.html.haml_spec.rb
index e0841959694..93f0adb991c 100644
--- a/spec/views/stream_entries/show.html.haml_spec.rb
+++ b/spec/views/stream_entries/show.html.haml_spec.rb
@@ -49,7 +49,7 @@ describe 'stream_entries/show.html.haml', without_verify_partial_doubles: true d
     assign(:stream_entry, reply.stream_entry)
     assign(:account, alice)
     assign(:type, reply.stream_entry.activity_type.downcase)
-    assign(:ancestors, reply.stream_entry.activity.ancestors(1, bob) )
+    assign(:ancestors, reply.stream_entry.activity.ancestors(1, bob))
     assign(:descendant_threads, [{ statuses: reply.stream_entry.activity.descendants(1) }])
 
     render