Missing overrided version of ActiveRecord::Associations::CollectionAssociation#ids_reader

[pustomytnyk]

When I'm trying to call model.association_ids for association with composite key it fails with <keys array> is not a symbol nor a string at line

activerecord (5.0.1) lib/active_record/associations/collection_association.rb:60:in block in ids_reader

    if loaded?
      load_target.map do |record|
fail => record.send(reflection.association_primary_key)
      end

[pustomytnyk]

I don't know what are correct test cases for this feature

[cfis]

Ok - do you have a traceback?

[pustomytnyk]

@cfis, it occurs in https://github.com/thoughtbot/administrate/blob/master/app/views/fields/has_many/_form.html.erb#L26
on line <%= f.select(field.attribute_key, nil, {}, multiple: true) do %>
where f.object is a model having my_association with composite key
and field.attribute_key is :my_association_ids

then traceback is:

activerecord (5.0.1) lib/active_record/associations/collection_association.rb:60:in `block in ids_reader'
activerecord (5.0.1) lib/active_record/associations/collection_association.rb:59:in `map'
activerecord (5.0.1) lib/active_record/associations/collection_association.rb:59:in `ids_reader'
activerecord (5.0.1) lib/active_record/associations/builder/collection_association.rb:56:in `authors_source_ids'
actionview (5.0.1) lib/action_view/helpers/tags/base.rb:28:in `public_send'
actionview (5.0.1) lib/action_view/helpers/tags/base.rb:28:in `value'
actionview (5.0.1) lib/action_view/helpers/tags/select.rb:16:in `block in render'
actionview (5.0.1) lib/action_view/helpers/tags/select.rb:16:in `fetch'
actionview (5.0.1) lib/action_view/helpers/tags/select.rb:16:in `render'
actionview (5.0.1) lib/action_view/helpers/form_options_helper.rb:163:in `select'
actionview (5.0.1) lib/action_view/helpers/form_options_helper.rb:817:in `select'

[cfis]

Pull request 391 merged.