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Configuring Rails Applications
==============================
This guide covers the configuration and initialization features available to Rails applications. By referring to this guide, you will be able to:
* Adjust the behavior of your Rails applications
* Add additional code to be run at application start time
== Locations for Initialization Code
preinitializers
environment.rb first
env-specific files
initializers (load_application_initializers)
after-initializer
== Using a Preinitializer
== Initialization Process Settings
== Configuring Rails Components
=== Configuring Active Record
+ActiveRecord::Base+ includej a variety of configuration options:
+logger+ accepts a logger conforming to the interface of Log4r or the default Ruby 1.8+ Logger class, which is then passed on to any new database connections made. You can retrieve this logger by calling +logger+ on either an ActiveRecord model class or an ActiveRecord model instance. Set to nil to disable logging.
+primary_key_prefix_type+ lets you adjust the naming for primary key columns. By default, Rails assumes that primary key columns are named +id+ (and this configuration option doesn't need to be set.) There are two other choices:
* +:table_name+ would make the primary key for the Customer class +customerid+
* +:table_name_with_underscore+ would make the primary key for the Customer class +customer_id+
+table_name_prefix+ lets you set a global string to be prepended to table names. If you set this to +northwest_+, then the Customer class will look for +northwest_customers+ as its table. The default is an empty string.
+table_name_suffix+ lets you set a global string to be appended to table names. If you set this to +_northwest+, then the Customer class will look for +customers_northwest+ as its table. The default is an empty string.
+pluralize_table_names+ specifies whether Rails will look for singular or plural table names in the database. If set to +true+ (the default), then the Customer class will use the +customers+ table. If set to +false+, then the Customers class will use the +customer+ table.
+colorize_logging+ (true by default) specifies whether or not to use ANSI color codes when logging information from ActiveRecord.
+default_timezone+ determines whether to use +Time.local+ (if set to +:local+) or +Time.utc+ (if set to +:utc+) when pulling dates and times from the database. The default is +:local+.
+schema_format+ controls the format for dumping the database schema to a file. The options are +:ruby+ (the default) for a database-independent version that depends on migrations, or +:sql+ for a set of (potentially database-dependent) SQL statements.
+timestamped_migrations+ controls whether migrations are numbered with serial integers or with timestamps. The default is +true+, to use timestamps, which are preferred if there are multiple developers working on the same application.
+lock_optimistically+ controls whether ActiveRecord will use optimistic locking. By default this is +true+.
The MySQL adapter adds one additional configuration option:
+ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans+ controls whether ActiveRecord will consider all +tinyint(1)+ columns in a MySQL database to be booleans. By default this is +true+.
The schema dumper adds one additional configuration option:
+ActiveRecord::SchemaDumper.ignore_tables+ accepts an array of tables that should _not_ be included in any generated schema file. This setting is ignored unless +ActiveRecord::Base.schema_format == :ruby+.
=== Configuring Action Controller
ActionController::Base includes a number of configuration settings:
+asset_host+ provides a string that is prepended to all of the URL-generating helpers in +AssetHelper+. This is designed to allow moving all javascript, CSS, and image files to a separate asset host.
+consider_all_requests_local+ is generally set to +true+ during development and +false+ during production; if it is set to +true+, then any error will cause detailed debugging information to be dumped in the HTTP response. For finer-grained control, set this to +false+ and implement +local_request?+ to specify which requests should provide debugging information on errors.
+allow_concurrency+ should be set to +true+ to allow concurrent (threadsafe) action processing. Set to +false+ by default.
+param_parsers+ provides an array of handlers that can extract information from incoming HTTP requests and add it to the +params+ hash. By default, parsers for multipart forms, URL-encoded forms, XML, and JSON are active.
+default_charset+ specifies the default character set for all renders. The default is "utf-8".
+logger+ accepts a logger conforming to the interface of Log4r or the default Ruby 1.8+ Logger class, which is then used to log information from Action Controller. Set to nil to disable logging.
+resource_action_separator+ gives the token to be used between resources and actions when building or interpreting RESTful URLs. By default, this is "/".
+resource_path_names+ is a hash of default names for several RESTful actions. By default, the new action is named +new+ and the edit action is named +edit+.
+request_forgery_protection_token+ sets the token parameter name for RequestForgery. Calling +protect_from_forgery+ sets it to +:authenticity_token+ by default.
+optimise_named_routes+ turns on some optimizations in generating the routing table. It is set to +true+ by default.
+use_accept_header+ sets the rules for determining the response format. If this is set to +true+ (the default) then +respond_to+ and +Request#format+ will take the Accept header into account. If it is set to false then the request format will be determined solely by examining +params[:format]+. If there is no +format+ parameter, then the response format will be either HTML or Javascript depending on whether the request is an AJAX request.
+allow_forgery_protection+ enables or disables CSRF protection. By default this is +false+ in test mode and +true+ in all other modes.
+relative_url_root+ can be used to tell Rails that you are deploying to a subdirectory. The default is +ENV['RAILS_RELATIVE_URL_ROOT']+.
The caching code adds two additional settings:
+ActionController::Caching::Pages.page_cache_directory+ sets the directory where Rails will create cached pages for your web server. The default is +Rails.public_path+ (which is usually set to +RAILS_ROOT + "/public"+).
+ActionController::Caching::Pages.page_cache_extension+ sets the extension to be used when generating pages for the cache (this is ignored if the incoming request already has an extension). The default is +.html+.
The dispatcher includes one setting:
+ActionController::Dispatcher.error_file_path+ gives the path where Rails will look for error files such as +404.html+. The default is +Rails.public_path+.
The Active Record session store can also be configured:
+CGI::Session::ActiveRecordStore::Session.data_column_name+ sets the name of the column to use to store session data. By default it is 'data'
=== Configuring Action View
There are only a few configuration options for Action View, starting with four on +ActionView::Base+:
+debug_rjs+ specifies whether RJS responses should be wrapped in a try/catch block that alert()s the caught exception (and then re-raises it). The default is +false+.
+warn_cache_misses+ tells Rails to display a warning whenever an action results in a cache miss on your view paths. The default is +false+.
+field_error_proc+ provides an HTML generator for displaying errors that come from Active Record. The default is +Proc.new{ |html_tag, instance| "<div class=\"fieldWithErrors\">#{html_tag}</div>" }+
+default_form_builder+ tells Rails which form builder to use by default. The default is +ActionView::Helpers::FormBuilder+.
The ERB template handler supplies one additional option:
+ActionView::TemplateHandlers::ERB.erb_trim_mode+ gives the trim mode to be used by ERB. It defaults to +'-'+.
=== Configuring Action Mailer
There are a number of settings available on +ActionMailer::Base+:
=== Configuring Active Resource
=== Configuring Active Support
== Using Initializers
organization, controlling load order
== Using an After-Initializer
== Rails Environment Settings
ENV
== Changelog ==
http://rails.lighthouseapp.com/projects/16213-rails-guides/tickets/28[Lighthouse ticket]
* November 5, 2008: Rough outline by link:../authors.html#mgunderloy[Mike Gunderloy]
actionmailer/lib/action_mailer/base.rb
257: cattr_accessor :logger
267: cattr_accessor :smtp_settings
273: cattr_accessor :sendmail_settings
276: cattr_accessor :raise_delivery_errors
282: cattr_accessor :perform_deliveries
285: cattr_accessor :deliveries
288: cattr_accessor :default_charset
291: cattr_accessor :default_content_type
294: cattr_accessor :default_mime_version
297: cattr_accessor :default_implicit_parts_order
299: cattr_reader :protected_instance_variables
actionmailer/Rakefile
36: rdoc.options << '--line-numbers' << '--inline-source' << '-A cattr_accessor=object'
actionpack/lib/action_controller/base.rb
263: cattr_reader :protected_instance_variables
273: cattr_accessor :asset_host
279: cattr_accessor :consider_all_requests_local
285: cattr_accessor :allow_concurrency
317: cattr_accessor :param_parsers
321: cattr_accessor :default_charset
325: cattr_accessor :logger
329: cattr_accessor :resource_action_separator
333: cattr_accessor :resources_path_names
337: cattr_accessor :request_forgery_protection_token
341: cattr_accessor :optimise_named_routes
351: cattr_accessor :use_accept_header
361: cattr_accessor :relative_url_root
actionpack/lib/action_controller/caching/pages.rb
55: cattr_accessor :page_cache_directory
58: cattr_accessor :page_cache_extension
actionpack/lib/action_controller/caching.rb
37: cattr_reader :cache_store
48: cattr_accessor :perform_caching
actionpack/lib/action_controller/dispatcher.rb
98: cattr_accessor :error_file_path
actionpack/lib/action_controller/mime_type.rb
24: cattr_reader :html_types, :unverifiable_types
actionpack/lib/action_controller/rescue.rb
36: base.cattr_accessor :rescue_responses
40: base.cattr_accessor :rescue_templates
actionpack/lib/action_controller/session/active_record_store.rb
60: cattr_accessor :data_column_name
170: cattr_accessor :connection
173: cattr_accessor :table_name
177: cattr_accessor :session_id_column
181: cattr_accessor :data_column
282: cattr_accessor :session_class
actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
44: cattr_accessor :included_tags, :instance_writer => false
actionpack/lib/action_view/base.rb
189: cattr_accessor :debug_rjs
193: cattr_accessor :warn_cache_misses
actionpack/lib/action_view/helpers/active_record_helper.rb
7: cattr_accessor :field_error_proc
actionpack/lib/action_view/helpers/form_helper.rb
805: cattr_accessor :default_form_builder
actionpack/lib/action_view/template_handlers/erb.rb
47: cattr_accessor :erb_trim_mode
actionpack/test/active_record_unit.rb
5: cattr_accessor :able_to_connect
6: cattr_accessor :connected
actionpack/test/controller/filters_test.rb
286: cattr_accessor :execution_log
actionpack/test/template/form_options_helper_test.rb
3:TZInfo::Timezone.cattr_reader :loaded_zones
activemodel/lib/active_model/errors.rb
28: cattr_accessor :default_error_messages
activemodel/Rakefile
19: rdoc.options << '--line-numbers' << '--inline-source' << '-A cattr_accessor=object'
activerecord/lib/active_record/attribute_methods.rb
9: base.cattr_accessor :attribute_types_cached_by_default, :instance_writer => false
11: base.cattr_accessor :time_zone_aware_attributes, :instance_writer => false
activeresource/lib/active_resource/base.rb
206: cattr_accessor :logger
activeresource/Rakefile
43: rdoc.options << '--line-numbers' << '--inline-source' << '-A cattr_accessor=object'
activesupport/lib/active_support/buffered_logger.rb
17: cattr_accessor :silencer
activesupport/lib/active_support/cache.rb
81: cattr_accessor :logger
activesupport/lib/active_support/core_ext/class/attribute_accessors.rb
5:# cattr_accessor :hair_colors
10: def cattr_reader(*syms)
29: def cattr_writer(*syms)
50: def cattr_accessor(*syms)
51: cattr_reader(*syms)
52: cattr_writer(*syms)
activesupport/lib/active_support/core_ext/logger.rb
34: cattr_accessor :silencer
activesupport/test/core_ext/class/attribute_accessor_test.rb
6: cattr_accessor :foo
7: cattr_accessor :bar, :instance_writer => false
activesupport/test/core_ext/module/synchronization_test.rb
6: @target.cattr_accessor :mutex, :instance_writer => false
railties/doc/guides/html/creating_plugins.html
786: cattr_accessor <span style="color: #990000">:</span>yaffle_text_field<span style="color: #990000">,</span> <span style="color: #990000">:</span>yaffle_date_field
860: cattr_accessor <span style="color: #990000">:</span>yaffle_text_field<span style="color: #990000">,</span> <span style="color: #990000">:</span>yaffle_date_field
railties/lib/rails_generator/base.rb
93: cattr_accessor :logger
railties/Rakefile
265: rdoc.options << '--line-numbers' << '--inline-source' << '--accessor' << 'cattr_accessor=object'
railties/test/rails_info_controller_test.rb
12: cattr_accessor :local_request
Rakefile
32: rdoc.options << '-A cattr_accessor=object'
need to look for def self. ???
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