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POIs it a bug of Mongoid or Rails3 ? Here are full codes that you can reproduce the strange 'bug'
 

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  1. POIs it a bug of Mongoid or Rails3 ? Here are full codes that you can reproduce the strange 'bug'
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    <pre><code>$ rails -v Rails 3.1.1 $ ruby -v ruby 1.9.2p312 (2011-08-11 revision 32926) [i686-linux] </code></pre> <p><strong>If you want to reproduce the problem, just follow me:</strong> </p> <p><strong>First, create these three model(just copy):</strong> </p> <pre><code>#school.rb class School include Mongoid::Document include Mongoid::Timestamps has_many :students end </code></pre> <hr> <pre><code>#student.rb class Student include Mongoid::Document include Mongoid::Timestamps has_many :books belongs_to :school accepts_nested_attributes_for :books end </code></pre> <hr> <pre><code>#book.rb class Book include Mongoid::Document include Mongoid::Timestamps field :name belongs_to :student validate :check def check # The calling for the 'school' method caused the issue self.student.school end end </code></pre> <p><strong>Second, run your console and paste:</strong> </p> <pre><code>ruby-1.9.2-head :001 &gt; School.destroy_all;Student.destroy_all; Book.destroy_all; School.create ruby-1.9.2-head :001 &gt; Student.create school_id: School.first.id, 'books_attributes' =&gt; {'1' =&gt; {'name' =&gt; 'I am a book'}} </code></pre> <hr> <p>Then, let's see what happend: </p> <pre><code>ruby-1.9.2-head :002 &gt; Book.count MONGODB xxx_development['$cmd'].find({"count"=&gt;"books", "query"=&gt;{}, "fields"=&gt;nil}) =&gt; 2 </code></pre> <p>And even more, if you set the 'student has_many books' relation to 'autosave: true':</p> <pre><code>class Student ...... has_many :books, autosave: true ...... end </code></pre> <p><strong>Let's see what will happend:</strong> </p> <pre><code>ruby-1.9.2-head :001 &gt; School.destroy_all;Student.destroy_all; Book.destroy_all; School.create ruby-1.9.2-head :001 &gt; Student.create school_id: School.first.id, 'books_attributes' =&gt; {'1' =&gt; {'name' =&gt; 'I am a book'}} ruby-1.9.2-head :002 &gt; Student.count MONGODB xxx_development['$cmd'].find({"count"=&gt;"students", "query"=&gt;{}, "fields"=&gt;nil}) =&gt; 2 ruby-1.9.2-head :004 &gt; Student.all.to_a MONGODB xxx_development['students'].find({}) =&gt; [#&lt;Student _id: 4f62a8341d41c81bc6000002, _type: nil, created_at: 2012-03-16 02:40:52 UTC, updated_at: 2012-03-16 02:40:52 UTC, school_id: BSON::ObjectId('4f62a8341d41c81bc6000001')&gt;, #&lt;Student _id: 4f62a8341d41c81bc6000003, _type: nil, created_at: 2012-03-16 02:40:52 UTC, updated_at: 2012-03-16 02:40:52 UTC, school_id: nil&gt;] ruby-1.9.2-head :005 &gt; Book.count MONGODB xxx_development['$cmd'].find({"count"=&gt;"books", "query"=&gt;{}, "fields"=&gt;nil}) =&gt; 2 ruby-1.9.2-head :006 &gt; Book.all.to_a MONGODB xxx_development['books'].find({}) =&gt; [#&lt;Book _id: 4f62a8341d41c81bc6000003, _type: nil, created_at: 2012-03-16 02:40:52 UTC, updated_at: 2012-03-16 02:40:52 UTC, name: "I am a book", student_id: BSON::ObjectId('4f62a8341d41c81bc6000002')&gt;, #&lt;Book _id: 4f62a8341d41c81bc6000002, _type: nil, created_at: 2012-03-16 02:40:52 UTC, updated_at: 2012-03-16 02:40:52 UTC, name: nil, student_id: nil&gt;] </code></pre> <p>This bug really run me crazy. Why there are <strong>additional models</strong> when calling 'school' in a book validate method?</p> <p>Or there is something I did wrong?</p>
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