Nested resources in rails not saving - ruby-on-rails

Question

Ive setup some nested resources in Rails using the following:
resources :notes do
resources :comments
end
But even though /notes/1/comments/new will take me to a new comments page, it does not make the association of the note for the comment. I have included an note_id field in the comment but this does not get populate. Any tips?
Comments controller:
class CommentsController < ApplicationController
before_action :set_comment, only: [:show, :edit, :update, :destroy]
# GET /comments
# GET /comments.json
def index
#comments = Comment.all
end
# GET /comments/1
# GET /comments/1.json
def show
end
# GET /comments/new
def new
#comment = Comment.new
end
# GET /comments/1/edit
def edit
end
# POST /comments
# POST /comments.json
def create
#comment = Comment.new(comment_params)
respond_to do |format|
if #comment.save
format.html { redirect_to #comment, notice: 'Comment was successfully created.' }
format.json { render :show, status: :created, location: #comment }
else
format.html { render :new }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /comments/1
# PATCH/PUT /comments/1.json
def update
respond_to do |format|
if #comment.update(comment_params)
format.html { redirect_to #comment, notice: 'Comment was successfully updated.' }
format.json { render :show, status: :ok, location: #comment }
else
format.html { render :edit }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
# DELETE /comments/1
# DELETE /comments/1.json
def destroy
#comment.destroy
respond_to do |format|
format.html { redirect_to comments_url, notice: 'Comment was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_comment
#comment = Comment.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def comment_params
params.require(:comment).permit(:note_id, :comment)
end
end
Form code:
<%= form_for(#comment) do |f| %>
<% if #comment.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#comment.errors.count, "error") %> prohibited this comment from being saved:</h2>
<ul>
<% #comment.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :note_id %><br>
<%= f.text_field :note_id %>
</div>
<div class="field">
<%= f.label :comment %><br>
<%= f.text_area :comment %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>

Answer 1

You should create your Comment like this in your controller:
class CommentsController < ApplicationController
before_action :set_comment, :set_note, only: [:show, :edit, :update, :destroy]
# Build your comment from your #note
# this sets all the association values correct (like ids)
def create
#comment = #note.comments.build(comment_params)
# etc...
end
def set_note
#note = Note.find(params[:note_id])
end
#...
end
So, using the #note.commments.build will help you on your issue. But of course, you need to query the #note using the note_id in the params hash.