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I have been following Railscasts episodes of Nested forms and complex forms. During the time of creating multiple model in a single form I was able to edit, update, delete and create records for sample models that were nested in the Batch model. I have been breaking my head from a long time and tried searching around as well but could not get any right solution for solving this problem. my development log file gives me the following error. ERROR MESSAGE: Status: 500 Internal Server Error expected Hash (got Array) for param `samples' in my controller I have the update action like this def update @batch = Batch.find(params[:id]) respond_to do |format| if @batch.update_attributes(params[:batch]) flash[:notice] = 'Successfully updated Batch.' format.html { redirect_to(@batch) } format.xml { head :ok } else format.html { render :action => "edit" } format.xml { render :xml => @batch.errors, :status => :unprocessable_entity } end end end my view is something like this: <%= form_for @batch do |f| %> ...... <%= f.fields_for :samples do |s_form| %> .... s_form things <% end %> <% end %> my model contains the same stuff : has_many :samples, :dependent => :destroy accepts_nested_attributes_for :samples, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true All suggestions are appreciated.

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