Rails ActiveRecord :counter_cache not updated if assocation not set up before create. Intentional? -

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i've implemented belongs_to relation :counter_cache => true , notice counter cache not updated if relation not set before initial save.

for instance, company has_many employees. if do

company.employees << employee.new(:name => "joe")

the counter gets updated correctly if do

company.employees << employee.create(:name => "joe")

the counter remains unchanged.

for more details, here models:

class employee < activerecord::base   belongs_to :company, :counter_cache => true end  class company < activerecord::base   has_many :employees end

and here's rails console session demonstrates this:

loading development environment (rails 3.0.5) ruby-1.9.2-p180 :001 > company_a = company.create(:name => "acme")  => #<company id: 1, name: "acme", created_at: "2011-07-22 01:31:39", updated_at: "2011-07-22 01:31:39", employees_count: 0>  ruby-1.9.2-p180 :002 > company_a.employees << employee.new(:name => "bob")  => [#<employee id: 1, company_id: 1, name: "bob", created_at: "2011-07-22 01:31:59", updated_at: "2011-07-22 01:31:59">]  ruby-1.9.2-p180 :003 > company_a.reload  => #<company id: 1, name: "acme", created_at: "2011-07-22 01:31:39", updated_at: "2011-07-22 01:31:39", employees_count: 1>  ruby-1.9.2-p180 :004 > company_a.employees << employee.create(:name => "joe")  => [#<employee id: 1, company_id: 1, name: "bob", created_at: "2011-07-22 01:31:59", updated_at: "2011-07-22 01:31:59">, #<employee id: 2, company_id: 1, name: "joe", created_at: "2011-07-22 01:32:28", updated_at: "2011-07-22 01:32:28">]  ruby-1.9.2-p180 :005 > company_a.reload  => #<company id: 1, name: "acme", created_at: "2011-07-22 01:31:39", updated_at: "2011-07-22 01:31:39", employees_count: 1>

the documentation counter incremented/decremented when object created/destroyed thinking should monitor updates useful. otherwise, say, moving employees between companies result in counters totally off.

is expected behavior? if so, what's rationale? , if not, doing wrong? tried in rails 3.0.5 , ruby 1.9.2

thanks!


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