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author | Stephen Pike <steve@sevenfifty.comexit> | 2011-10-11 09:32:23 -0400 |
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committer | Stephen Pike <steve@sevenfifty.comexit> | 2011-10-11 09:32:23 -0400 |
commit | c4e29541724433fd1c96715bde829209066ca205 (patch) | |
tree | 19473e034fa806a12ab17979515b7da8cd7a884f /railties/guides | |
parent | 3ca269674f66558f6ced4d956ecae4959dacd596 (diff) | |
download | rails-c4e29541724433fd1c96715bde829209066ca205.tar.gz rails-c4e29541724433fd1c96715bde829209066ca205.tar.bz2 rails-c4e29541724433fd1c96715bde829209066ca205.zip |
Runtime conditions for associations should use procs
The association guide previously recommended using a trick with single
quote delaying of string interpolation in order to handle setting association
conditions that would be evaluated at runtime. Using a proc is the new way as
this no longer works.
Diffstat (limited to 'railties/guides')
-rw-r--r-- | railties/guides/source/association_basics.textile | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/railties/guides/source/association_basics.textile b/railties/guides/source/association_basics.textile index 479a3c1e30..6829eb8ef4 100644 --- a/railties/guides/source/association_basics.textile +++ b/railties/guides/source/association_basics.textile @@ -1229,17 +1229,15 @@ end If you use a hash-style +:conditions+ option, then record creation via this association will be automatically scoped using the hash. In this case, using +@customer.confirmed_orders.create+ or +@customer.confirmed_orders.build+ will create orders where the confirmed column has the value +true+. -If you need to evaluate conditions dynamically at runtime, you could use string interpolation in single quotes: +If you need to evaluate conditions dynamically at runtime, use a proc: <ruby> class Customer < ActiveRecord::Base has_many :latest_orders, :class_name => "Order", - :conditions => 'orders.created_at > #{10.hours.ago.to_s(:db).inspect}' + :conditions => proc { "orders.created_at > #{10.hours.ago.to_s(:db).inspect}" } end </ruby> -Be sure to use single quotes. - h6(#has_many-counter_sql). +:counter_sql+ Normally Rails automatically generates the proper SQL to count the association members. With the +:counter_sql+ option, you can specify a complete SQL statement to count them yourself. |