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PONested attributes problem in rails 3 with mongoid (nested objects aren`t saved)
 

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    <p>So I have a simple application as in <a href="http://railscasts.com/episodes/196-nested-model-form-part-1" rel="nofollow">RailsCast about nested forms.</a> and a problem is that when I submit the form (with survey and questions) <strong>the questions are not saved</strong>. </p> <p>My models (Survey, that has many Questions):</p> <pre><code>class Survey include Mongoid::Document field :name has_many :questions, :dependent =&gt; :destroy accepts_nested_attributes_for :questions, :allow_destroy =&gt; true end class Question include Mongoid::Document field :content belongs_to :survey end </code></pre> <p>and Survey Controller:</p> <pre><code>def new @survey = Survey.new 3.times {@survey.questions.build} .... </code></pre> <p>and a view:</p> <pre><code>&lt;%= form_for(@survey) do |f| %&gt; &lt;%= f.fields_for :questions do |builder| %&gt; &lt;%= builder.label :content, "Question" %&gt;&lt;br /&gt; &lt;%= builder.text_area :content, :rows =&gt; 3 %&gt;&lt;br /&gt; &lt;%= builder.check_box :_destroy %&gt; &lt;%= builder.label :_destroy, "Remove Question" %&gt; &lt;% end %&gt; ... </code></pre> <p>In my log I have:</p> <pre><code> Started POST "/surveys" for 127.0.0.1 at 2011-05-24 13:26:51 +0400 Processing by SurveysController#create as HTML Parameters: {"utf8"=&gt;"G£ô", "authenticity_token"=&gt;"tX0FfMiLbh1BwjuY4CuvAKt2UpTraY3vmdo58ocBnos=", "survey"=&gt;{"name"=&gt;" Rails", "questions_attributes"=&gt;{"0"=&gt;{"content"=&gt;"Are you fond of Rails?", "_destroy"=&gt;"0"}, "1"=&gt;{"content"=&gt;"Rails is the best, ha?", "_destroy"=&gt;"0"}, "2"=&gt;{"content"=&gt;"How many railscasts have you watched?", "_destroy"=&gt;"0"}}}, "commit "=&gt;"Create Survey"} MONGODB nested_attributes_development['surveys'].insert([{"name"=&gt;"Rails", "_id"=&gt;BSON::ObjectId('4ddb79dba5372914380000 69')}]) Redirected to http://localhost:3000/surveys/4ddb79dba537291438000069 </code></pre>
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