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authorPratik Naik <pratiknaik@gmail.com>2010-08-31 00:14:49 +0100
committerPratik Naik <pratiknaik@gmail.com>2010-08-31 00:14:49 +0100
commit6d8fc26ce860259d05d4655af584641e4bf33554 (patch)
tree9a07ca3799c91b0e2bbcebb5daa6bbf32e76e249
parent5a310f8335a407f2c95a84f1c73db20846370216 (diff)
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Fix the readonly section
-rw-r--r--railties/guides/source/active_record_querying.textile16
1 files changed, 5 insertions, 11 deletions
diff --git a/railties/guides/source/active_record_querying.textile b/railties/guides/source/active_record_querying.textile
index 811f45d8b3..70a0ab9fcb 100644
--- a/railties/guides/source/active_record_querying.textile
+++ b/railties/guides/source/active_record_querying.textile
@@ -509,22 +509,16 @@ This will return single order objects for each day, but only for the last month.
h4. Readonly Objects
-To explicitly disallow modification/destruction of the matching records returned in a Relation object, you could chain the +readonly+ method as +true+ to the find call.
-
-Any attempt to alter or destroy the readonly records will not succeed, raising an +ActiveRecord::ReadOnlyRecord+ exception. To set this option, specify it like this:
-
-<ruby>
-Client.first.readonly(true)
-</ruby>
-
-For example, calling the following code will raise an +ActiveRecord::ReadOnlyRecord+ exception:
+Active Record provides +readonly+ method on a relation to explicitly disallow modification or deletion of any of the returned object. Any attempt to alter or destroy a readonly record will not succeed, raising an +ActiveRecord::ReadOnlyRecord+ exception.
<ruby>
-client = Client.first.readonly(true)
-client.locked = false
+client = Client.readonly.first
+client.visits += 1
client.save
</ruby>
+As +client+ is explicitly set to be a readonly object, the above code will raise an +ActiveRecord::ReadOnlyRecord+ exception when trying to calling +client.save+ with an updated value of _visists_.
+
h4. Locking Records for Update
Locking is helpful for preventing race conditions when updating records in the database and ensuring atomic updates.