Readme.markdown in deferred_associations-0.5.3 vs Readme.markdown in deferred_associations-0.5.4
- old
+ new
@@ -1,8 +1,10 @@
Make ActiveRecord defer/postpone saving the records you add to an habtm (has_and_belongs_to_many) or has_many association
until you call model.save, allowing validation in the style of normal attributes.
+[](http://travis-ci.org/MartinKoerner/deferred_associations) [](https://gemnasium.com/MartinKoerner/deferred_associations)
+
How to install
==============
gem install deferred_associations
@@ -24,31 +26,40 @@
errors.add :tables, "There are too many tables in this room"
end
# Neither people nor tables are saved to the database, if a validation error is added
end
- def check_usage
+ def check_change
# you can check, if there were changes to the association
if people != people_without_deferred_save
self.updated_at = Time.now.utc
end
end
end
Compatibility
=============
-Tested with Rails 2.3.14, 3.2.2
+Tested with Rails 2.3.14, 3.2.3 on Ruby 1.8.7, 1.9.3 and JRuby 1.6.6
Gotchas
=======
Be aware, that the habtm association objects sometimes asks the database instead of giving you the data directly from the array. So you can get something
like
- room = Room.new
+ room = Room.create
room.people << Person.create
room.people.first # => nil, since the DB doesn't have the association saved yet
+
+
+Also it is good to know, that the array you set to an association is stored there directly, so after setting a list, the typical association
+methods are not working:
+
+ room = Room.create
+ room.people.klass # => Person
+ room.people = [Person.first]
+ room.people.klass # => undefined method klass for #Array:0x007fa3b9efc2c0`
Bugs
====
http://github.com/MartinKoerner/deferred_associations/issues
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