diff options
Diffstat (limited to 'activerecord/lib/active_record')
| -rwxr-xr-x | activerecord/lib/active_record/base.rb | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb index 65dc7275df..c7db48167c 100755 --- a/activerecord/lib/active_record/base.rb +++ b/activerecord/lib/active_record/base.rb @@ -1806,6 +1806,20 @@ module ActiveRecord #:nodoc: record end + # Returns an instance of the specified klass with the attributes of the current record. This is mostly useful in relation to + # single-table inheritance structures where you want a subclass to appear as the superclass. This can be used along with record + # identification in Action Pack to allow, say, Client < Company to do something like render :partial => @client.becomes(Company) + # to render that instance using the companies/company partial instead of clients/client. + # + # Note: The new instance will share a link to the same attributes as the original class. So any change to the attributes in either + # instance will affect the other. + def becomes(klass) + returning klass.new do |became| + became.instance_variable_set("@attributes", @attributes) + became.instance_variable_set("@new_record", new_record?) + end + end + # Updates a single attribute and saves the record. This is especially useful for boolean flags on existing records. # Note: This method is overwritten by the Validation module that'll make sure that updates made with this method # aren't subjected to validation checks. Hence, attributes can be updated even if the full object isn't valid. |