diff options
Diffstat (limited to 'railties/guides/source/active_support_core_extensions.textile')
| -rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 48 |
1 files changed, 40 insertions, 8 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index 1fe805d2d7..221d20fee6 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -1036,18 +1036,24 @@ module ActionView end </ruby> -we can access +field_error_proc+ in views. The generation of the writer instance method can be prevented by setting +:instance_writer+ to +false+ (not any false value, but exactly +false+): +we can access +field_error_proc+ in views. + +The generation of the reader instance method can be prevented by setting +:instance_reader+ to +false+ and the generation of the writer instance method can be prevented by setting +:instance_writer+ to +false+. Generation of both methods can be prevented by setting +:instance_accessor+ to +false+. In all cases, the value must be exactly +false+ and not any false value. <ruby> -module ActiveRecord - class Base - # No pluralize_table_names= instance writer is generated. - cattr_accessor :pluralize_table_names, :instance_writer => false +module A + class B + # No first_name instance reader is generated. + cattr_accessor :first_name, :instance_reader => false + # No last_name= instance writer is generated. + cattr_accessor :last_name, :instance_writer => false + # No surname instance reader or surname= writer is generated. + cattr_accessor :surname, :instance_accessor => false end end </ruby> -A model may find that option useful as a way to prevent mass-assignment from setting the attribute. +A model may find it useful to set +:instance_accessor+ to +false+ as a way to prevent mass-assignment from setting the attribute. NOTE: Defined in +active_support/core_ext/class/attribute_accessors.rb+. @@ -2300,7 +2306,7 @@ NOTE: Defined in +active_support/core_ext/array/grouping.rb+. h5. +in_groups(number, fill_with = nil)+ -The method +in_groups+ splits an array into a certain number of groups. The method returns and array with the groups: +The method +in_groups+ splits an array into a certain number of groups. The method returns an array with the groups: <ruby> %w(1 2 3 4 5 6 7).in_groups(3) @@ -2732,7 +2738,7 @@ Active Support extends the method +Range#step+ so that it can be invoked without (1..10).step(2) # => [1, 3, 5, 7, 9] </ruby> -As the example shows, in that case the method returns and array with the corresponding elements. +As the example shows, in that case the method returns an array with the corresponding elements. NOTE: Defined in +active_support/core_ext/range/blockless_step.rb+. @@ -3334,6 +3340,32 @@ Active Support defines +Time.current+ to be today in the current time zone. That When making Time comparisons using methods which honor the user time zone, make sure to use +Time.current+ and not +Time.now+. There are cases where the user time zone might be in the future compared to the system time zone, which +Time.today+ uses by default. This means +Time.now+ may equal +Time.yesterday+. +h5. +all_day+, +all_week+, +all_month+, +all_quarter+ and +all_year+ + +The method +all_day+ returns a range representing the whole day of the current time. + +<ruby> +now = Time.current +# => Mon, 09 Aug 2010 23:20:05 UTC +00:00 +now.all_day +# => Mon, 09 Aug 2010 00:00:00 UTC +00:00..Mon, 09 Aug 2010 23:59:59 UTC +00:00 +</ruby> + +Analogously, +all_week+, +all_month+, +all_quarter+ and +all_year+ all serve the purpose of generating time ranges. + +<ruby> +now = Time.current +# => Mon, 09 Aug 2010 23:20:05 UTC +00:00 +now.all_week +# => Mon, 09 Aug 2010 00:00:00 UTC +00:00..Sun, 15 Aug 2010 23:59:59 UTC +00:00 +now.all_month +# => Sat, 01 Aug 2010 00:00:00 UTC +00:00..Tue, 31 Aug 2010 23:59:59 UTC +00:00 +now.all_quarter +# => Thu, 01 Jul 2010 00:00:00 UTC +00:00..Thu, 30 Sep 2010 23:59:59 UTC +00:00 +now.all_year +# => Fri, 01 Jan 2010 00:00:00 UTC +00:00..Fri, 31 Dec 2010 23:59:59 UTC +00:00 +</ruby> + h4. Time Constructors Active Support defines +Time.current+ to be +Time.zone.now+ if there's a user time zone defined, with fallback to +Time.now+: |