ruby on rails - incompatible character encodings: ASCII-8BIT and UTF-8

Question

I use Ruby 1.9.2 and Rails 3.0.5

I have the following error:

incompatible character encodings: ASCII-8BIT and UTF-8

It has nothing to do with the database i think.

The error is happinging on this line in a view (just a div haml call):

#content

full stack:

    ActionView::Template::Error (incompatible character encodings: ASCII-8BIT and UTF-8):
        21:                     -flash.each do |name, msg|
        22:                         =content_tag :div, msg, :id => "flash_#{name}"
        23:                         %div.clear                      
        24:                     #content                                        
        25:                         = yield
        26:             = render :partial => "layouts/grid_right" if render_grid_right?
        27:             = render :partial => "layouts/footer"
      app/views/layouts/application.html.haml:24:in `_app_views_layouts_application_html_haml___4380000789490545718_2180251300_2717546578298801795'
      actionpack (3.0.5) lib/action_view/template.rb:135:in `block in render'
      activesupport (3.0.5) lib/active_support/notifications.rb:54:in `instrument'
      actionpack (3.0.5) lib/action_view/template.rb:127:in `render'
      actionpack (3.0.5) lib/action_view/render/layouts.rb:80:in `_render_layout'
      actionpack (3.0.5) lib/action_view/render/rendering.rb:62:in `block in _render_template'
      activesupport (3.0.5) lib/active_support/notifications.rb:52:in `block in instrument'
      activesupport (3.0.5) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
      activesupport (3.0.5) lib/active_support/notifications.rb:52:in `instrument'
      actionpack (3.0.5) lib/action_view/render/rendering.rb:56:in `_render_template'
      actionpack (3.0.5) lib/action_view/render/rendering.rb:26:in `render'
      haml (3.0.25) lib/haml/helpers/action_view_mods.rb:13:in `render_with_haml'
      actionpack (3.0.5) lib/abstract_controller/rendering.rb:115:in `_render_template'
      actionpack (3.0.5) lib/abstract_controller/rendering.rb:109:in `render_to_body'
      actionpack (3.0.5) lib/action_controller/metal/renderers.rb:47:in `render_to_body'
      actionpack (3.0.5) lib/action_controller/metal/compatibility.rb:55:in `render_to_body'
      actionpack (3.0.5) lib/abstract_controller/rendering.rb:102:in `render_to_string'
      actionpack (3.0.5) lib/abstract_controller/rendering.rb:93:in `render'
      actionpack (3.0.5) lib/action_controller/metal/rendering.rb:17:in `render'
      actionpack (3.0.5) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
      activesupport (3.0.5) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
      /Users/michaelkoper/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
      activesupport (3.0.5) lib/active_support/core_ext/benchmark.rb:5:in `ms'
      actionpack (3.0.5) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
      actionpack (3.0.5) lib/action_controller/metal/instrumentation.rb:78:in `cleanup_view_runtime'
      activerecord (3.0.5) lib/active_record/railties/controller_runtime.rb:15:in `cleanup_view_runtime'
      actionpack (3.0.5) lib/action_controller/metal/instrumentation.rb:39:in `render'
      actionpack (3.0.5) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
      actionpack (3.0.5) lib/action_controller/metal/mime_responds.rb:261:in `block in retrieve_response_from_mimes'
      actionpack (3.0.5) lib/action_controller/metal/mime_responds.rb:192:in `call'
      actionpack (3.0.5) lib/action_controller/metal/mime_responds.rb:192:in `respond_to'
      app/controllers/home_controller.rb:9:in `index'
      actionpack (3.0.5) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
      actionpack (3.0.5) lib/abstract_controller/base.rb:150:in `process_action'
      actionpack (3.0.5) lib/action_controller/metal/rendering.rb:11:in `process_action'
      actionpack (3.0.5) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
      activesupport (3.0.5) lib/active_support/callbacks.rb:445:in `_run__3968431659371141392__process_action__3163094469870857953__callbacks'
      activesupport (3.0.5) lib/active_support/callbacks.rb:409:in `_run_process_action_callbacks'
      activesupport (3.0.5) lib/active_support/callbacks.rb:93:in `run_callbacks'
      actionpack (3.0.5) lib/abstract_controller/callbacks.rb:17:in `process_action'
      actionpack (3.0.5) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
      activesupport (3.0.5) lib/active_support/notifications.rb:52:in `block in instrument'
      activesupport (3.0.5) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
      activesupport (3.0.5) lib/active_support/notifications.rb:52:in `instrument'
      actionpack (3.0.5) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
      actionpack (3.0.5) lib/action_controller/metal/rescue.rb:17:in `process_action'
      actionpack (3.0.5) lib/abstract_controller/base.rb:119:in `process'
      actionpack (3.0.5) lib/abstract_controller/rendering.rb:41:in `process'
      actionpack (3.0.5) lib/action_controller/metal.rb:138:in `dispatch'
      actionpack (3.0.5) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
      actionpack (3.0.5) lib/action_controller/metal.rb:178:in `block in action'
      actionpack (3.0.5) lib/action_dispatch/routing/route_set.rb:62:in `call'
      actionpack (3.0.5) lib/action_dispatch/routing/route_set.rb:62:in `dispatch'
      actionpack (3.0.5) lib/action_dispatch/routing/route_set.rb:27:in `call'
      rack-mount (0.6.13) lib/rack/mount/route_set.rb:148:in `block in call'
      rack-mount (0.6.13) lib/rack/mount/code_generation.rb:93:in `block in recognize'
      rack-mount (0.6.13) lib/rack/mount/code_generation.rb:68:in `optimized_each'
      rack-mount (0.6.13) lib/rack/mount/code_generation.rb:92:in `recognize'
      rack-mount (0.6.13) lib/rack/mount/route_set.rb:139:in `call'
      actionpack (3.0.5) lib/action_dispatch/routing/route_set.rb:492:in `call'
      haml (3.0.25) lib/sass/plugin/rack.rb:41:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/head.rb:14:in `call'
      rack (1.2.1) lib/rack/methodoverride.rb:24:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/flash.rb:182:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/cookies.rb:302:in `call'
      activerecord (3.0.5) lib/active_record/query_cache.rb:32:in `block in call'
      activerecord (3.0.5) lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
      activerecord (3.0.5) lib/active_record/query_cache.rb:12:in `cache'
      activerecord (3.0.5) lib/active_record/query_cache.rb:31:in `call'
      activerecord (3.0.5) lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/callbacks.rb:46:in `block in call'
      activesupport (3.0.5) lib/active_support/callbacks.rb:415:in `_run_call_callbacks'
      actionpack (3.0.5) lib/action_dispatch/middleware/callbacks.rb:44:in `call'
      rack (1.2.1) lib/rack/sendfile.rb:107:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
      railties (3.0.5) lib/rails/rack/logger.rb:13:in `call'
      rack (1.2.1) lib/rack/runtime.rb:17:in `call'
      activesupport (3.0.5) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
      rack (1.2.1) lib/rack/lock.rb:11:in `block in call'
      <internal:prelude>:10:in `synchronize'
      rack (1.2.1) lib/rack/lock.rb:11:in `call'
      actionpack (3.0.5) lib/action_dispatch/middleware/static.rb:30:in `call'
      railties (3.0.5) lib/rails/application.rb:168:in `call'
      railties (3.0.5) lib/rails/application.rb:77:in `method_missing'
      railties (3.0.5) lib/rails/rack/log_tailer.rb:14:in `call'
      rack (1.2.1) lib/rack/content_length.rb:13:in `call'
      rack (1.2.1) lib/rack/chunked.rb:15:in `call'
      rack (1.2.1) lib/rack/handler/mongrel.rb:67:in `process'
      mongrel (1.2.0.pre2) lib/mongrel.rb:165:in `block in process_client'
      mongrel (1.2.0.pre2) lib/mongrel.rb:164:in `each'
      mongrel (1.2.0.pre2) lib/mongrel.rb:164:in `process_client'
      mongrel (1.2.0.pre2) lib/mongrel.rb:291:in `block (2 levels) in run'

My gems:

        Using rake (0.8.7) 
        Using RedCloth (4.2.2) 
        Using abstract (1.0.0) 
        Using activesupport (3.0.5) 
        Using builder (2.1.2) 
        Using i18n (0.5.0) 
        Using activemodel (3.0.5) 
        Using erubis (2.6.6) 
        Using rack (1.2.1) 
        Using rack-mount (0.6.13) 
        Using rack-test (0.5.7) 
        Using tzinfo (0.3.24) 
        Using actionpack (3.0.5) 
        Using mime-types (1.16) 
        Using polyglot (0.3.1) 
        Using treetop (1.4.9) 
        Using mail (2.2.15) 
        Using actionmailer (3.0.5) 
        Using arel (2.0.9) 
        Using activerecord (3.0.5) 
        Using activeresource (3.0.5) 
        Using authlogic (2.1.6) 
        Using xml-simple (1.0.14) 
        Using aws-s3 (0.6.2) 
        Using block_helpers (0.3.3) 
        Using bundler (1.0.10) 
        Using diff-lcs (1.1.2) 
        Using json (1.4.6) 
        Using gherkin (2.3.4) 
        Using term-ansicolor (1.0.5) 
        Using cucumber (0.10.0) 
        Using cucumber-rails (0.3.2) 
        Using daemons (1.0.10) 
        Using database_cleaner (0.6.5) 
        Using factory_girl (1.3.3) 
        Using faker (0.9.5) 
        Using formtastic (1.2.3) 
        Using gem_plugin (0.2.3) 
        Using haml (3.0.25) 
        Using thor (0.14.6) 
        Using railties (3.0.5) 
        Using rails (3.0.5) 
        Using kaminari (0.10.4) 
        Using mongrel (1.2.0.pre2) 
        Using mysql2 (0.2.6) 
        Using nokogiri (1.4.4) 
        Using paperclip (2.3.8) 
        Using rspec-core (2.5.1) 
        Using rspec-expectations (2.5.0) 
        Using rspec-mocks (2.5.0) 
        Using rspec (2.5.0) 
        Using yard (0.6.4) 
        Using pickle (0.4.4) 
        Using populator (1.0.0) 
        Using rspec-rails (2.5.0) 
        Using webrat (0.7.3) 

Answer 1

I solved it by following these steps:

• Make sure config.encoding = "utf-8" is in the application.rb file.
• Make sure you are using the 'mysql2' gem.
• Put # encoding: utf-8 at the top of file containing UTF-8 characters.

• Above the <App Name>::Application.initialize! line in the environment.rb file, add following two lines:

  Encoding.default_external = Encoding::UTF_8
  Encoding.default_internal = Encoding::UTF_8
  

http://rorguide.blogspot.com/2011/06/incompatible-character-encodings-ascii.html