diff options
Diffstat (limited to 'railties/guides/source')
| -rw-r--r-- | railties/guides/source/active_record_querying.textile | 4 | ||||
| -rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 28 |
2 files changed, 29 insertions, 3 deletions
diff --git a/railties/guides/source/active_record_querying.textile b/railties/guides/source/active_record_querying.textile index 8ea06d28aa..4e77a6e803 100644 --- a/railties/guides/source/active_record_querying.textile +++ b/railties/guides/source/active_record_querying.textile @@ -560,6 +560,7 @@ Client.where("orders_count > 10").order(:name).reverse_order </ruby> The SQL that would be executed: + <sql> SELECT * FROM clients WHERE orders_count > 10 ORDER BY name DESC </sql> @@ -571,6 +572,7 @@ Client.where("orders_count > 10").reverse_order </ruby> The SQL that would be executed: + <sql> SELECT * FROM clients WHERE orders_count > 10 ORDER BY clients.id DESC </sql> @@ -621,8 +623,6 @@ You're then responsible for dealing with the conflict by rescuing the exception NOTE: You must ensure that your database schema defaults the +lock_version+ column to +0+. -<br /> - This behavior can be turned off by setting <tt>ActiveRecord::Base.lock_optimistically = false</tt>. To override the name of the +lock_version+ column, +ActiveRecord::Base+ provides a class method called +set_locking_column+: diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index e1fa374aca..df863935cf 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -452,6 +452,30 @@ Examples of +in?+: NOTE: Defined in +active_support/core_ext/object/inclusion.rb+. +h4. +public_send+ + +This method is available by default in Ruby 1.9, and is backported to Ruby 1.8 by Active Support. Like the regular +send+ method, +public_send+ allows you to call a method when the name is not known until runtime. However, if the method is not public then a +NoMethodError+ exception will be raised. + +<ruby> +class Greeter + def hello(who) + "Hello " + who + end + + private + + def secret + "sauce" + end +end + +greeter = Greeter.new +greeter.public_send(:hello, 'Jim') # => "Hello Jim" +greeter.public_send(:secret) # => NoMethodError +</ruby> + +NOTE: Defined in +active_support/core_ext/object/public_send.rb+. + h3. Extensions to +Module+ h4. +alias_method_chain+ @@ -864,7 +888,9 @@ end It is shorter, and the intention more obvious. -The macro accepts several methods: +The method must be public in the target. + +The +delegate+ macro accepts several methods: <ruby> delegate :name, :age, :address, :twitter, :to => :profile |