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Type: Task
Resolution: Done
Fix Version/s: 3.1.5
Affects Version/s: None
Component/s: None
Labels:
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I am getting a weird error and I'm not sure whether it is caused by what I am doing or by Mongoid.

I have a Booking model with embedded LineItem models. My class definitions look like this (reduced down for clarity).

class Booking
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::History::Trackable

  track_history track_destroy: true, track_create: true

  embeds_many :line_items
end

class LineItem
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::History::Trackable

  track_history track_destroy: true, track_create: true

  field :amount, type: BigDecimal, default: 0
  field :quantity, type: Integer, default: 1

  embedded_in :booking

  default_scope order_by amount: :desc

  belongs_to :item, polymorphic: true

  def total_price
    return 0 if amount.blank? || quantity.blank?
    amount * quantity
  end
end

This is the error and stacktrace that I get:

Unable to find source-code formatter for language: shell. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml

>irb(main):010:0> b = Booking.find(...)
>irb(main):011:0> b.line_items
NoMethodError: undefined method `*' for nil:NilClass
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:382:in `block (2 levels) in in_place_sort'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:379:in `sort!'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:379:in `block in in_place_sort'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:378:in `each_pair'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:378:in `in_place_sort'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:344:in `apply_sorting'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual/memory.rb:168:in `initialize'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual.rb:47:in `new'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual.rb:47:in `create_context'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual.rb:30:in `context'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual.rb:20:in `rescue in each'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/contextual.rb:18:in `each'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/embedded/many.rb:432:in `entries'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/embedded/many.rb:432:in `scope'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/embedded/many.rb:224:in `block in initialize'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/proxy.rb:38:in `init'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/embedded/many.rb:218:in `initialize'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/accessors.rb:44:in `new'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/accessors.rb:44:in `create_relation'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/accessors.rb:26:in `__build__'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/accessors.rb:156:in `block (3 levels) in getter'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/threaded/lifecycle.rb:125:in `_loading'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/accessors.rb:156:in `block (2 levels) in getter'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/threaded/lifecycle.rb:84:in `_building'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/mongoid-3.0.3/lib/mongoid/relations/accessors.rb:155:in `block in getter'
  from (irb):11
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
  from /Users/jord/.rbenv/versions/1.9.3-p385/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
  from script/rails:6:in `require'

If I remove the default_scope line, the error goes away.

Am I doing something wrong or is this a bug?

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