Couldn't find ProjectSession with 'id'= - ruby-on-rails

Question

Here i have a project to which i am adding a session and for a project session i am trying to add task.
i am able to create project and add project session for project but when i am trying to add task for session using project_sessions_id i am getting error Couldn't find ProjectSession with 'id'= and 'app/controllers/tasks_controller.rb:60:in set_project_session i am able to get the project session id also project_sessions/11 in the url but when i click 'create task' i am getting this error. how can i resolve this?
here's what i have done
ProjectSessionController:
class ProjectSessionsController < ApplicationController
before_action :set_project_session, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!
before_action :set_project
def index
#project_sessions = ProjectSession.all
end
def show
#project_sessions = ProjectSession.where(project_id: #project.id).order("created_at DESC")
end
def new
#project_session = ProjectSession.new
end
def edit
end
def create
#project_session = ProjectSession.new(project_session_params)
#project_session.project_id = #project.id
#respond_to do |format|
if #project_session.save
redirect_to #project
#format.html { redirect_to #project_session, notice: 'Project session was successfully created.' }
#format.json { render :show, status: :created, location: #project_session }
else
format.html { render :new }
format.json { render json: #project_session.errors, status: :unprocessable_entity }
end
#end
end
def update
respond_to do |format|
if #project_session.update(project_session_params)
format.html { redirect_to #project_session, notice: 'Project session was successfully updated.' }
format.json { render :show, status: :ok, location: #project_session }
else
format.html { render :edit }
format.json { render json: #project_session.errors, status: :unprocessable_entity }
end
end
end
def destroy
#project_session.destroy
respond_to do |format|
format.html { redirect_to project_sessions_url, notice: 'Project session was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_project_session
#project_session = ProjectSession.find(params[:id])
end
def set_project
#project = Project.find(params[:project_id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def project_session_params
params.require(:project_session).permit(:session_date, :session_name, :session_description, :start_time, :end_time)
end
end
Task controller:
class TasksController < ApplicationController
before_action :set_task, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!
before_action :set_project_session
def index
#tasks = Task.all
end
def show
end
def new
#task = Task.new
end
def edit
end
def create
#task = Task.new(task_params)
#task.session_id = #project_session.id
respond_to do |format|
if #task.save
redirect_to #project_session
else
format.html { render :new }
format.json { render json: #task.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if #task.update(task_params)
format.html { redirect_to #task, notice: 'Task was successfully updated.' }
format.json { render :show, status: :ok, location: #task }
else
format.html { render :edit }
format.json { render json: #task.errors, status: :unprocessable_entity }
end
end
end
def destroy
#task.destroy
respond_to do |format|
format.html { redirect_to tasks_url, notice: 'Task was successfully destroyed.' }
format.json { head :no_content }
end
end
private
def set_task
#task = Task.find(params[:id])
end
def set_project_session
#project_session = ProjectSession.find(params[:project_session_id])
end
def task_params
params.require(:task).permit(:name, :description)
end
end
routes:
Rails.application.routes.draw do
get 'hr_dashboard/index'
resources :roles
resources :project_sessions
devise_for :users
resources :tasks
resources :projects do
resources :project_sessions, except: [:show, :index]
end
resources :project_sessions do
resources :tasks, except: [:show, :index]
end
authenticated :user do
root 'admindashboard#index', as:"authenticated_root"
end
root 'welcome#index'
get 'userdashboard/index'
get 'admindashboard/index'
get 'welcome/index'
end
View for creating new task
<div class="container">
<h1>New Task</h1>
<%= form_for(#task) do |f| %>
<% if #task.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#task.errors.count, "error") %> prohibited this task from being saved:</h2>
<ul>
<% #task.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :description %><br>
<%= f.text_area :description %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
<%= link_to 'Back', tasks_path %>
</div>

Answer 1

I figured it out!
I had forgotten to add #project_session in
<%= form_for([#project_session, #task]) do |f| %>
just added that and it worked.

Answer 2

In your create action of Task controller, you have to add:
#task= #project_session.tasks.build(task_params)
Because right now, you're not telling the task, to build from the project_session (or with respect to the project_session) you're just telling it to create a new task.
#task = Task.new
And in the routes.rb file, you've prepared for that to happen by nesting the resources, so it's currently looking for the ID of a task that belongs_to project_session. But can't find any.
And also, in your form_for element when creating a ProjectSssion you have let that form know which route it should belong to - I guess you could say - since you still have the un-nested resources available:
resources :tasks
If project_sessions shouldn't be creatable without a parent, there's no reasons for keeping that, so you should just remove it.
Anyways, here's what the form_for should look like:
<%= form_for([#project_session, #task]) do |f| %>