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author | Vijay Dev <vijaydev.cse@gmail.com> | 2011-06-13 23:14:15 +0530 |
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committer | Vijay Dev <vijaydev.cse@gmail.com> | 2011-06-13 23:14:15 +0530 |
commit | 3b4f04ab832b00806b2de78f1947d6438dd13f59 (patch) | |
tree | a9a15d686739642b45f7af21f1ddcf6bc9752081 /railties/guides/source | |
parent | 67a705f95241e447b996487e5c42f2245f83aca2 (diff) | |
download | rails-3b4f04ab832b00806b2de78f1947d6438dd13f59.tar.gz rails-3b4f04ab832b00806b2de78f1947d6438dd13f59.tar.bz2 rails-3b4f04ab832b00806b2de78f1947d6438dd13f59.zip |
document the instance_accessor option for cattr_accessor
Diffstat (limited to 'railties/guides/source')
-rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index 16cacc9928..f9f7f2d83c 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+. |