Rails - Passing a variable while using Simple Form

Question

When creating a new model object using simple form, I need to pass the id of one object to the new object as it relies on the id for its URL. The routing is:

resources :coins do
  resources :questions
end

I am attempting to do this using a hidden field tag but its not working. The ID is not passed and as a result, the new object does not save.

<%= simple_form_for @question, url: coin_questions_path(@coin.id) do |f| %>
    <%= f.input :ques_num %>
    <%= f.input :content %>
    <%= hidden_field_tag(:coin_id, @coin.id) %>
    <%= f.button :submit, 'Submit' %>
<% end %>

Prior to this, I was using collection_select in simple form to manually enter the ID and it worked, however I need it to happen automatically. Is there a better way of doing this that will do what I am looking for?

Question model:

class QuestionsController < ApplicationController

  before_action :find_question, only: [:show, :edit, :update, :destroy ]
  before_action :find_coin
  before_action :authenticate_user!, except: [:index, :show]

  def index
    @questions = Question.where(coin_id: @coin.id).order("created_at DESC")
  end

  def show
  end

  def new
    @coin
    @question = current_user.questions.build
  end

    def create
      @question = current_user.questions.build(question_params)
      if @question.save
        redirect_to coin_question_path(@coin.id, @question.id)
      else
        render 'new'
      end
    end

  .
  .
  .

  private

    def find_question
        @question = Question.find(params[:id])
    end

    def find_coin
      @coin = Coin.find(params[:coin_id])
    end

    def question_params
        params.require(:question).permit(:content, :ques_num, :coin_id)
    end

end

Right now you're finding the @coin before all your actions. I don't think that's necessary :) — Peter Højlund Palluth
– Peter Højlund Palluth, Commented Jan 20, 2018 at 19:42

Peter Højlund Palluth · Accepted Answer · 2018-01-20 19:46:06Z

1

You could easily use hidden_field with a value - read more

For example:

<%= f.hidden_field :coin_id, value: @coin.id %>

And then the value will be in the params[:question][:coin_id] on create, so the rest should work as it is now. :)

edited Jan 20, 2018 at 19:46

answered Jan 20, 2018 at 19:39

Peter Højlund Palluth

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Comments

Josh Brody · Accepted Answer · 2018-01-20 19:51:14Z

0

<%= hidden_field_tag(:coin_id, @coin.id) %> will generate a field with a name of just "coin_id"; you want "question[coin_id]"

You should, in turn, assign this value to the object in your controller. @question.coin_id = @coin.id, or @question = Question.new(:user => current_user, :coin => @coin) or @question = current_user.questions.new(:coin => @coin)

<%= f.input :coin_id, :as => :hidden %>

edited Jan 20, 2018 at 19:51

answered Jan 20, 2018 at 19:30

Josh Brody

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1 Comment

Peter Højlund Palluth Over a year ago

The input is missing the @coin.id.

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