replace if ! with unless

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

actionmailer/lib/action_mailer/old_api.rb

@@ -212,7 +212,7 @@ module ActionMailer
 
         # If this is a multipart e-mail add the mime_version if it is not
         # already set.
-        @mime_version ||= "1.0" if !@parts.empty?
+        @mime_version ||= "1.0" unless @parts.empty?
       end
     end
 

actionpack/lib/action_controller/metal/http_authentication.rb

@@ -407,7 +407,7 @@ module ActionController
       # Returns nil if no token is found.
       def authenticate(controller, &login_procedure)
         token, options = token_and_options(controller.request)
-        if !token.blank?
+        unless token.blank?
           login_procedure.call(token, options)
         end
       end

activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb

@@ -72,7 +72,7 @@ module ActiveRecord
           end
 
           adapter_method = "#{spec[:adapter]}_connection"
-          if !respond_to?(adapter_method)
+          unless respond_to?(adapter_method)
             raise AdapterNotFound, "database configuration specifies nonexistent #{spec[:adapter]} adapter"
           end
 

activesupport/lib/active_support/dependencies.rb

@@ -166,7 +166,7 @@ module ActiveSupport #:nodoc:
       def const_missing(const_name, nesting = nil)
         klass_name = name.presence || "Object"
 
-        if !nesting
+        unless nesting
           # We'll assume that the nesting of Foo::Bar is ["Foo::Bar", "Foo"]
           # even though it might not be, such as in the case of
           # class Foo::Bar; Baz; end

activesupport/lib/active_support/secure_random.rb

@@ -95,7 +95,7 @@ module ActiveSupport
           end
         end
 
-        if !defined?(@has_win32)
+        unless defined?(@has_win32)
           begin
             require 'Win32API'
 

railties/lib/rails/application.rb

@@ -147,7 +147,7 @@ module Rails
         middleware.use ::Rack::Cache, rack_cache  if rack_cache
 
         middleware.use ::ActionDispatch::Static, config.static_asset_paths if config.serve_static_assets
-        middleware.use ::Rack::Lock if !config.allow_concurrency
+        middleware.use ::Rack::Lock unless config.allow_concurrency
         middleware.use ::Rack::Runtime
         middleware.use ::Rails::Rack::Logger
         middleware.use ::ActionDispatch::ShowExceptions, config.consider_all_requests_local if config.action_dispatch.show_exceptions

railties/lib/rails/rack/log_tailer.rb

@@ -19,7 +19,7 @@ module Rails
       def tail!
         @file.seek @cursor
 
-        if !@file.eof?
+        unless @file.eof?
           contents = @file.read
           @cursor = @file.tell
           $stdout.print contents