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Merging two relations (ActiveRecord::Relation) created with joins() method does not work.

#5132 
class Containment < ActiveRecord::Base
  belongs_to :child, :class_name => 'Unit'
end

Containment.joins(:child => :properties) works fine but

Containment.joins(:child) & Unit.joins(:properties) raises an exception:

ActiveRecord::ConfigurationError: Association named 'properties' was not found; perhaps you misspelled it?
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/associations.rb:1818:in `build'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/associations.rb:1823:in `block in build'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/associations.rb:1822:in `each'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/associations.rb:1822:in `build'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/associations.rb:1739:in `initialize'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/relation/query_methods.rb:133:in `new'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/relation/query_methods.rb:133:in `build_arel'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/relation/query_methods.rb:93:in `arel'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/relation.rb:64:in `to_a'
    from /home/rupert/.rvm/gems/ruby-1.9.2-head/gems/activerecord-3.0.0.beta4/lib/active_record/relation.rb:324:in `inspect

I think that both expressions should be equal and behave in the same way.

Reported by Robert Pankowecki · July 16th, 2010 @ 09:38 AM

State: stale
Milestone: none
Assigned to: nobody
Importance: none

Activity

  1. Santiago Pastorino
    Santiago Pastorino
    • State changed from new to open

    This issue has been automatically marked as stale because it has not been commented on for at least three months.

    The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.

    Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.

    February 2nd, 2011 @ 04:36 PM

  2. Santiago Pastorino
    Santiago Pastorino
    • State changed from open to stale

    February 2nd, 2011 @ 04:36 PM