Untitled

accepts_nested_attributes_for alias?
class Topic < ActiveRecord::Base
  has_many :choices, :dependent => :destroy
  accepts_nested_attributes_for :choices
  attr_accessible :title, :choices
end

ActiveRecord::AssociationTypeMismatch (Choice(#70365943501680) expected,
got ActiveSupport::HashWithIndifferentAccess(#70365951899600)):

def create
    choices = params[:topic].delete(:choices)
    @topic = Topic.new(params[:topic])
    if choices
      choices.each do |choice|
        @topic.choices.build(choice)
      end
    end
    if @topic.save
      render json: @topic, status: :created, location: @topic
    else
      render json: @topic.errors, status: :unprocessable_entity
    end
  end

def choices=(params)
  self.choices_attributes = params
end