Ruby on Rails - Creating many models associated with another one

Question

So I have the following models:

class Poll < ApplicationRecord validates :title, presence: true, allow_blank: false validates :options, presence: true has_many :options, dependent: :destroy end class Option < ApplicationRecord validates :title, presence: true, allow_blank: false belongs_to :poll end 

And given the following data:

{ title: "My poll", options: [ {title: "Option 1"}, {title: "Option 2"}, {title: "Option 3"}, ] } 

I would like to create a poll with 3 options.

This is my solution:

 # POST /polls def create @poll = Poll.new(poll_params) params[:options].each do |option| @poll.options.new option.permit(:title) end if @poll.save render json: @poll, status: :created, location: @poll else render json: @poll.errors.full_messages, status: :unprocessable_entity end end 

Answer 1

You should be able to do this with accepts_nested_attributes_for. see https://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for

class Poll < ApplicationRecord validates :title, presence: true, allow_blank: false validates :options, presence: true has_many :options, dependent: :destroy accepts_nested_attributes_for :options end def poll_params params.require(:poll).permit(:title, options: :title) end def create @poll = Poll.new(poll_params) if @poll.save render json: @poll, status: :created, location: @poll else render json: @poll.errors.full_messages, status: :unprocessable_entity end end