Rails 5: autosave associated record creating duplicate records of the parent model

Question

I am currently learning rails and is attempting to create a Survey management application. The application have the following models:

class Survey < ApplicationRecord
  has_many :survey_questions
  has_many :questions, through: : survey_questions
  accepts_nested_attributes_for :questions
end

class SurveyQuestion < ApplicationRecord
  belongs_to :survey
  belongs_to :question
end

class Question < ApplicationRecord
  has_many :survey_questions
  has_many :surveys, through: :survey_questions
end

I want to be able to automatically associate existing questions ID to be used instead of creating a whole new list of questions every time I create a new Survey.

I found this solution which was close to what I want accepts_nested_attributes_for with find_or_create? . It is able to associate my records correctly, but at the end of the transaction it will always create a new record at Question model regardless.

Can anyone suggest why is this happening and help point me to the right direction? Thank you!

EDIT

Below is the code for my create, new and survey_params method:

def new
  @survey = Survey.new
  @questions = Question.all

  unless @question.blank?
    @questions.each do |question|
      @survey.questions.build(name: question)
    end
  end
end

def create
  @survey = Survey.new(survey_params)
  @survey.save!
end

def survey_params
  params.require(:survey).permit(:enddate, questions_params: [:name])
end

Below is my view for new and questions_fields, I am using cocoon gem to help me to help generate them dynamically:

new

= simple_form_for @survey, url: survey_index_path, method: :post do |f|
  = f.input :finaldate, as: :string

  = f.simple_fields_for :questions do |qn|
    = render 'question_fields', f: qn

  = link_to_add_association 'New Question', f, :questions

question_fields

= f.input :name
= link_to_remove_association 'Remove Question', f