diff options
Diffstat (limited to 'railties/guides/source/active_support_core_extensions.textile')
| -rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 56 |
1 files changed, 31 insertions, 25 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index 3ba840c044..f89c83e4cd 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -442,9 +442,9 @@ require_library_or_gem('mysql') NOTE: Defined in +active_support/core_ext/kernel/requires.rb+. -h4. +in?+ and +either?+ +h4. +in?+ -The predicate +in?+ tests if an object is included in another object, and the predicate +either?+ tests if an object is included in a list of objects which will be passed as arguments. +The predicate +in?+ tests if an object is included in another object. An +ArgumentError+ exception will be raised if the argument passed does not respond to +include?+. Examples of +in?+: @@ -454,14 +454,6 @@ Examples of +in?+: 25.in?(30..50) # => false </ruby> -Examples of +either?+: - -<ruby> - 1.either?(1,2,3) # => true - 5.either?(1,2,3) # => false - [1,2,3].either?([1,2,3], 2, [3,4,5]) # => true -</ruby> - NOTE: Defined in +active_support/core_ext/object/inclusion.rb+. h3. Extensions to +Module+ @@ -1274,6 +1266,15 @@ WARNING: The option +:separator+ can't be a regexp. NOTE: Defined in +active_support/core_ext/string/filters.rb+. +h4. +inquiry+ + +The <tt>inquiry</tt> method converts a string into a +StringInquirer+ object making equality checks prettier. + +<ruby> +"production".inquiry.production? # => true +"active".inquiry.inactive? # => false +</ruby> + h4. Key-based Interpolation In Ruby 1.9 the <tt>%</tt> string operator supports key-based interpolation, both formatted and unformatted: @@ -2005,6 +2006,11 @@ Similarly, +from+ returns the tail from the element at the passed index on: The methods +second+, +third+, +fourth+, and +fifth+ return the corresponding element (+first+ is built-in). Thanks to social wisdom and positive constructiveness all around, +forty_two+ is also available. +<ruby> +%w(a b c d).third # => c +%w(a b c d).fifth # => nil +</ruby> + NOTE: Defined in +active_support/core_ext/array/access.rb+. h4. Random Access @@ -2100,7 +2106,7 @@ h5. +to_xml+ The method +to_xml+ returns a string containing an XML representation of its receiver: <ruby> -Contributor.all(:limit => 2, :order => 'rank ASC').to_xml +Contributor.limit(2).order(:rank).to_xml # => # <?xml version="1.0" encoding="UTF-8"?> # <contributors type="array"> @@ -2175,7 +2181,7 @@ The name of children nodes is by default the name of the root node singularized. The default XML builder is a fresh instance of <tt>Builder::XmlMarkup</tt>. You can configure your own builder via the <tt>:builder</tt> option. The method also accepts options like <tt>:dasherize</tt> and friends, they are forwarded to the builder: <ruby> -Contributor.all(:limit => 2, :order => 'rank ASC').to_xml(:skip_types => true) +Contributor.limit(2).order(:rank).to_xml(:skip_types => true) # => # <?xml version="1.0" encoding="UTF-8"?> # <contributors> @@ -3415,11 +3421,11 @@ h4. +silence+ Silences every log level lesser to the specified one for the duration of the given block. Log level orders are: debug, info, error and fatal. <ruby> - logger = Logger.new("log/development.log") - logger.silence(Logger::INFO) do - logger.debug("In space, no one can hear you scream.") - logger.info("Scream all you want, small mailman!") - end +logger = Logger.new("log/development.log") +logger.silence(Logger::INFO) do + logger.debug("In space, no one can hear you scream.") + logger.info("Scream all you want, small mailman!") +end </ruby> h4. +datetime_format=+ @@ -3427,17 +3433,17 @@ h4. +datetime_format=+ Modifies the datetime format output by the formatter class associated with this logger. If the formatter class does not have a +datetime_format+ method then this is ignored. <ruby> - class Logger::FormatWithTime < Logger::Formatter - cattr_accessor(:datetime_format) { "%Y%m%d%H%m%S" } +class Logger::FormatWithTime < Logger::Formatter + cattr_accessor(:datetime_format) { "%Y%m%d%H%m%S" } - def self.call(severity, timestamp, progname, msg) - "#{timestamp.strftime(datetime_format)} -- #{String === msg ? msg : msg.inspect}\n" - end + def self.call(severity, timestamp, progname, msg) + "#{timestamp.strftime(datetime_format)} -- #{String === msg ? msg : msg.inspect}\n" end +end - logger = Logger.new("log/development.log") - logger.formatter = Logger::FormatWithTime - logger.info("<- is the current time") +logger = Logger.new("log/development.log") +logger.formatter = Logger::FormatWithTime +logger.info("<- is the current time") </ruby> NOTE: Defined in +active_support/core_ext/logger.rb+. |