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  1. Mongoid
  2. MONGOID-4317

Nested eager loading fails with nils

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Critical - P2 Critical - P2
    • 6.0.0, 5.1.5
    • Affects Version/s: 5.1.4
    • Component/s: None

      Mongoid raises an unexpected NoMethodError when trying to eager load through a nested relationship that is `nil`.

      Concretely, given the models

      class Blog
  include Mongoid::Document
  has_one :post
end

class Post
  include Mongoid::Document
  belongs_to :blog
  belongs_to :author
end

class Author
  include Mongoid::Document
end

      with seed data

      Blog.create()

      the following code

      Blog.includes(:post => :author).to_a

      raises the error

      NoMethodError: undefined method `set_relation' for nil:NilClass
from /Users/martin/.rvm/gems/ruby-2.2.3/gems/mongoid-5.1.4/lib/mongoid/relations/eager/base.rb:148:in `set_relation'

      Note that the non-nested version works correctly:

      Blog.includes(:post).to_a

            Assignee:
            Unassigned Unassigned
            Reporter:
            mmun Martin Muñoz
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              Created:
              Updated:
              Resolved: