No route for post comments - ruby-on-rails

Question

ive been having a problem now for 2 days, i followed many videos and tutorials on how to add comments to a post, and for everyone else it seemed to work smoothly.
I got 4 controllers, Users,Posts,Comments and Walls , basically this site is gonna be a facebook clone. So im displaying everything on the Wall index.html.erb
The error im getting is:
No route matches {:action=>"index", :controller=>"comments", :post_id=>nil} missing required keys: [:post_id]
Routes:
Rails.application.routes.draw do
devise_for :users
resources :uploads
resources :users
resources :posts do
resources :comments
end
resources :walls
root 'walls#index'
end
Comments-controller:
class CommentsController < ApplicationController
before_action :find_post
def index
#comments = Comment.all
end
def new
#post = Post.find(params[:post_id])
end
def create
#comment = #post.comments.create(params[:comment].permit(:content))
#comment.post_id = #post.id
#comment.user_id = current_user.id
#comment.save
# #comment = #post.comments.create(params[:comment].permit[:content])
# #comment.post_id = #post.id
respond_to do |format|
if #comment.save
format.html { redirect_to root_path }
# format.json { render :show, status: :created, location: #post }
else
format.html { render :new }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
private
# Use callbacks to share common setup or constraints between actions.
# def comment_params
# params.require(:comment).permit(:content)
# end
def find_post
#post = Post.find(params[:post_id])
end
end
Posts-controller:
class PostsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!
def new
#post = Post.new
#comment = Comment.new
end
# GET /posts/1/edit
def edit
#post = Post.find(params[:id])
#post.user_id = current_user.id
end
# POST /posts
# POST /posts.json
def create
#post = Post.new(post_params)
#post.user_id = current_user.id
#post.user = current_user
respond_to do |format|
if #post.save
format.html { redirect_to root_path }
# format.json { render :show, status: :created, location: #post }
else
format.html { render :new }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posts/1
# PATCH/PUT /posts/1.json
def update
#post.user_id = current_user.id
#post.save
respond_to do |format|
if #post.update(params[:post].permit(:image,:content,:youtube_url))
format.html { redirect_to root_path, notice: 'Post was successfully updated.' }
format.json { render :show, status: :ok, location: #post }
format.json { respond_with_bip(#post) }
else
format.html { render :edit }
format.json { render json: #post.errors, status: :unprocessable_entity }
format.json { respond_with_bip(#post) }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
#post = Post.find(params[:id])
#post.destroy
respond_to do |format|
format.html { redirect_to root_path, notice: 'Post was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
#post = Post.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def post_params
params.require(:post).permit(:content, :image, :username, :avatar, :youtube_url,:image_cache)
end
end
I am rendering the form in the index.html.erb for the wall controller index
<%= render "form" %>
And the form loop
views/walls/_form.html.erb
<div class="comments">
<%= form_for ([#post, #post.comments.build]) do |f| %>
byebug
<%= f.text_area :content, class: 'comments js-auto-size', id: 'alex2' ,:rows => 1 %>
<%= f.submit "Submit", class: "btn btn-default" %>
<% end %>
</div>
I dont understand why it cant find the post_id though :/

Answer 1

Since your comments is nested inside posts in routes, you have to pass post_id to the index in CommentsController
class CommentsController < ApplicationController
before_action :find_post
def index
#comments = #post.comments
end
end
# in view
<%= link_to "Comments", post_comments_path(#post) %>
Otherwise, you can define comments to be independent resources so you can do it without passing post_id
Rails.application.routes.draw do
resources :posts
resources :comments
end