Custom ids of integer not found from params

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      When using a custom id of integer type Mongoid throws an error when finding a document by the string id from the controller parameter.

      This code illustrates the problem:

      class Band
  include Mongoid::Document
  field :band_id, :type => Integer,    :type => Integer, default: ->{ Random.rand(10000000000).to_i }
  field :_id, :type => Integer, default: ->{ band_id }
end

      Mongoid throws an error if the id is provided as a string from a controller parameter:

      1.9.3p194 :007 >   Band.create
 => #<Band _id: 8219652764, _type: nil, band_id: 8219652764> 

1.9.3p194 :008 > Band.find("8219652764")
Mongoid::Errors::DocumentNotFound: 
Problem:
  Document(s) not found for class Band with id(s) 8219652764.

              Assignee:
              Unassigned
              Reporter:
              digitalplaywright
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                Created:
                Updated:
                Resolved: