aboutsummaryrefslogtreecommitdiffstats
path: root/railties/guides/source/association_basics.textile
diff options
context:
space:
mode:
authorJon Leighton <j@jonathanleighton.com>2011-03-02 21:24:56 +0000
committerJon Leighton <j@jonathanleighton.com>2011-03-04 09:30:27 +0000
commit735844db712c511dd8abf36a5279318fbc0ff9d0 (patch)
tree5fbd5d224ef85d8c878bf221db98b422c9345466 /railties/guides/source/association_basics.textile
parent9a98c766e045aebc2ef6d5b716936b73407f095d (diff)
parentb171b9e73dcc6a89b1da652da61c5127fe605b51 (diff)
downloadrails-735844db712c511dd8abf36a5279318fbc0ff9d0.tar.gz
rails-735844db712c511dd8abf36a5279318fbc0ff9d0.tar.bz2
rails-735844db712c511dd8abf36a5279318fbc0ff9d0.zip
Merge branch 'master' into nested_has_many_through
Conflicts: activerecord/CHANGELOG activerecord/lib/active_record/association_preload.rb activerecord/lib/active_record/associations.rb activerecord/lib/active_record/associations/class_methods/join_dependency.rb activerecord/lib/active_record/associations/class_methods/join_dependency/join_association.rb activerecord/lib/active_record/associations/has_many_association.rb activerecord/lib/active_record/associations/has_many_through_association.rb activerecord/lib/active_record/associations/has_one_association.rb activerecord/lib/active_record/associations/has_one_through_association.rb activerecord/lib/active_record/associations/through_association_scope.rb activerecord/lib/active_record/reflection.rb activerecord/test/cases/associations/has_many_through_associations_test.rb activerecord/test/cases/associations/has_one_through_associations_test.rb activerecord/test/cases/reflection_test.rb activerecord/test/cases/relations_test.rb activerecord/test/fixtures/memberships.yml activerecord/test/models/categorization.rb activerecord/test/models/category.rb activerecord/test/models/member.rb activerecord/test/models/reference.rb activerecord/test/models/tagging.rb
Diffstat (limited to 'railties/guides/source/association_basics.textile')
-rw-r--r--railties/guides/source/association_basics.textile12
1 files changed, 9 insertions, 3 deletions
diff --git a/railties/guides/source/association_basics.textile b/railties/guides/source/association_basics.textile
index 62abc40c81..e5b8c73c43 100644
--- a/railties/guides/source/association_basics.textile
+++ b/railties/guides/source/association_basics.textile
@@ -65,7 +65,7 @@ To learn more about the different types of associations, read the next section o
h3. The Types of Associations
-In Rails, an _association_ is a connection between two Active Record models. Associations are implemented using macro-style calls, so that you can declaratively add features to your models. For example, by declaring that one model +belongs_to+ another, you instruct Rails to maintain Primary Key–Foreign Key information between instances of the two models, and you also get a number of utility methods added to your model. Rails supports six types of association:
+In Rails, an _association_ is a connection between two Active Record models. Associations are implemented using macro-style calls, so that you can declaratively add features to your models. For example, by declaring that one model +belongs_to+ another, you instruct Rails to maintain Primary Key–Foreign Key information between instances of the two models, and you also get a number of utility methods added to your model. Rails supports six types of associations:
* +belongs_to+
* +has_one+
@@ -165,6 +165,12 @@ class Paragraph < ActiveRecord::Base
end
</ruby>
+With +:through => :sections+ specified, Rails will now understand:
+
+<ruby>
+@document.paragraphs
+</ruby>
+
h4. The +has_one :through+ Association
A +has_one :through+ association sets up a one-to-one connection with another model. This association indicates that the declaring model can be matched with one instance of another model by proceeding _through_ a third model. For example, if each supplier has one account, and each account is associated with one account history, then the customer model could look like this:
@@ -1135,7 +1141,7 @@ h6(#has_many-collection-find). <tt><em>collection</em>.find(...)</tt>
The <tt><em>collection</em>.find</tt> method finds objects within the collection. It uses the same syntax and options as +ActiveRecord::Base.find+.
<ruby>
-@open_orders = @customer.orders.find(:all, :conditions => "open = 1")
+@open_orders = @customer.orders.all(:conditions => "open = 1")
</ruby>
NOTE: Starting Rails 3, supplying options to +ActiveRecord::Base.find+ method is discouraged. Use <tt><em>collection</em>.where</tt> instead when you need to pass conditions.
@@ -1564,7 +1570,7 @@ h6(#has_and_belongs_to_many-collection-find). <tt><em>collection</em>.find(...)<
The <tt><em>collection</em>.find</tt> method finds objects within the collection. It uses the same syntax and options as +ActiveRecord::Base.find+. It also adds the additional condition that the object must be in the collection.
<ruby>
-@new_assemblies = @part.assemblies.find(:all,
+@new_assemblies = @part.assemblies.all(
:conditions => ["created_at > ?", 2.days.ago])
</ruby>