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You need to specify the counter_cache option on the has_many side of the association when using a custom counter cache column. This is documented on the has_many association here: http://apidock.com/rails/ActiveRecord/Associations/ClassMethods/has_many [ci skip]

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Steve Lounsbury 2014-12-16 01:58:19 +00:00
parent 72a815c3fd
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8
guides/source/association_basics.md
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@ -879,10 +879,12 @@ class Order < ActiveRecord::Base
belongs_to :customer, counter_cache: :count_of_orders belongs_to :customer, counter_cache: :count_of_orders
end end
class Customer < ActiveRecord::Base class Customer < ActiveRecord::Base
has_many :orders has_many :orders, counter_cache: :count_of_orders
end end
``` ```
NOTE: You only need to specify the :counter_cache option on the "has_many side" of the association when using a custom name for the counter cache.
Counter cache columns are added to the containing model's list of read-only attributes through `attr_readonly`. Counter cache columns are added to the containing model's list of read-only attributes through `attr_readonly`.
##### `:dependent` ##### `:dependent`
@ -1495,6 +1497,7 @@ The `has_many` association supports these options:
* `:as` * `:as`
* `:autosave` * `:autosave`
* `:class_name` * `:class_name`
* `:counter_cache`
* `:dependent` * `:dependent`
* `:foreign_key` * `:foreign_key`
* `:inverse_of` * `:inverse_of`
@ -1522,6 +1525,9 @@ class Customer < ActiveRecord::Base
end end
``` ```
##### `:counter_cache`
This option can be used to configure a custom named `:counter_cache`. You only need this option when you customized the name of your `:counter_cache` on the [belongs_to association](#options-for-belongs-to).
##### `:dependent` ##### `:dependent`
Controls what happens to the associated objects when their owner is destroyed: Controls what happens to the associated objects when their owner is destroyed: