I would remove the :type option from that filter - as it's not a single 
datetime value, but a collection of them (:multi). Though I'm not sure if 
that's the problem you're seeing here...

What happens if you just write:
  has comments.created_at, :as => :comments_created_at

-- 
Pat

On 28/10/2010, at 2:51 AM, Surbhi wrote:

> Hi,
> 
> I have the following model
> 
> class Post < ActiveRecord::Base
>  # Sphinx server indexing
>  has_many :comments
> define_index do
>    #fields
>    indexes title
>    has
> comments(:created_at),:as=> :comment_created_at, :type=> :datetime
>    has created_at, :type => :datetime
>  end
> end
> 
> Now, I have a model named Comment.
> 
> Scenario: I want to search for posts which have comments created in a
> given date range.
> 
> For this I have added attribute " has
> comments(:created_at),:as=> :comment_created_at, :type=> :datetime"
> 
> Issue: When I create a new post it gives the folloiwng error:
> 
> 
> NoMethodError: undefined method `created_at' for []:Array
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/associations/association_proxy.rb:148:in `send'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/associations/association_proxy.rb:148:in `send'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/attribute.rb:187:in `live_value'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:37:in
> `attribute_values_for_
> index'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/base.rb:2036:in `inject'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:36:in `each'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:36:in `inject'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:36:in
> `attribute_values_for_
> index'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:17:in
> `update_attribute_valu
> es'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:16:in `each'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/thinking-
> sphinx-1.3.20/lib
> /thinking_sphinx/active_record/attribute_updates.rb:16:in
> `update_attribute_valu
> es'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:178:in `send'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:178:in `evaluate_method'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:166:in `call'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:93:in `run'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:92:in `each'
> ... 1 levels...
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:92:in `run'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activesupport-2.3.5/lib/ac
> tive_support/callbacks.rb:276:in `run_callbacks'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/callbacks.rb:344:in `callback'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> after_commit-1.0.8/lib/aft
> er_commit/connection_adapters.rb:129:in `send'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> after_commit-1.0.8/lib/aft
> er_commit/connection_adapters.rb:129:in
> `trigger_after_commit_callbacks'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> after_commit-1.0.8/lib/aft
> er_commit/connection_adapters.rb:128:in `each'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> after_commit-1.0.8/lib/aft
> er_commit/connection_adapters.rb:128:in
> `trigger_after_commit_callbacks'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> after_commit-1.0.8/lib/aft
> er_commit/connection_adapters.rb:36:in `commit_db_transaction'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/connection_adapters/abstract/database_statements.rb:159:in
> `transacti
> on_without_callback'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> after_commit-1.0.8/lib/aft
> er_commit/connection_adapters.rb:12:in `transaction'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/transactions.rb:182:in `transaction'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/transactions.rb:228:in `with_transaction_returning_status'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/transactions.rb:196:in `save'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/transactions.rb:208:in `rollback_active_record_state!'
>        from F:/Softwares/ruby/lib/ruby/gems/1.8/gems/
> activerecord-2.3.5/lib/act
> ive_record/transactions.rb:196:in `save'
>        from (irb):2>>
> 
> -- 
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