Rails error: Couldn't find Node with 'id'=index? - ruby-on-rails

Question

I generate a node to show node name, but error . Here is the codo.
controllers/nodes_controller.rb (default)
class NodesController < ApplicationController
before_action :set_node, only: [:show, :edit, :update, :destroy]
def index
#nodes = Node.all
end
def show
#node = Node.find(params[:id])
end
def new
#node = Node.new
end
def edit
end
def create
#list = Node.new(node_params)
respond_to do |format|
if #node.save
format.html { redirect_to #node, notice: 'Node was successfully created.' }
format.json { render :show, status: :created, location: #node }
else
format.html { render :new }
format.json { render json: #list.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /lists/1
# PATCH/PUT /lists/1.json
def update
respond_to do |format|
if #node.update(node_params)
format.html { redirect_to #node, notice: 'Node was successfully updated.' }
format.json { render :show, status: :ok, location: #node }
else
format.html { render :edit }
format.json { render json: #node.errors, status: :unprocessable_entity }
end
end
end
# DELETE /lists/1
# DELETE /lists/1.json
def destroy
#node.destroy
respond_to do |format|
format.html { redirect_to nodes_url, notice: 'Node was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_node
#node = Node.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def node_params
params.require(:node).permit(:name, :summary)
end
end
models/node.rb
class Node < ActiveRecord::Base
has_many :lists
end
views/nodes/index.html.erb
<div class="nodes_list">
nodes: <br> <br>
<% nodes.each do |node| %>
<button class="secondary hollow button tiny">
<% if list.node %>
<%= link_to node.name, node %>
<% end %>
</button>
<% end %>
</div>
routes.rb
Rails.application.routes.draw do
mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
resources :lists, only: [:index, :show, :new, :create]
resources :nodes, only: [:show, :index, :create, :new]
root 'lists#index'
end
rails s http://localhost:3000/nodes/index
ActiveRecord::RecordNotFound in NodesController#show
Couldn't find Node with 'id'=index
Extracted source (around line #61):
# Use callbacks to share common setup or constraints between actions.
60 def set_node
61 #node = Node.find(params[:id])
62 end
Request
Parameters:
{"id"=>"index"}
What should I do? How to debug? Thanks tell me.

Answer 1

You don't need to hit http://localhost:3000/nodes/index for the index action to be invoked in Rails controller. All you have to do is to go for http://localhost:3000/nodes, and it will hit the index action in your controller.
Anything like http://localhost:3000/nodes/something will take you to show action, and something will be taken as id to find a particular node. And since you are hitting: http://localhost:3000/nodes/index, so Rails is taking index as id to find a particular node.
Stick with the Rails convention, and REST principles, and let the magic of Rails take care of the things, and it sticks the following routes to particular actions:
GET: http://localhost:3000/nodes ----> Nodes#index
GET: http://localhost:3000/nodes/something ------> Nodes#show