Rendering a partial form on a static page - ruby-on-rails

Question

I have a static page I named home and used scaffold to generate a form called Specialists and when I try to render the form using the following code
<%= render :partial => 'specialists/form', locals: {specialist: #specialist} %>
I get the following error undefined method "errors" for nil:NilClass and here is the code snippet of the error
Extracted source (around line #2):
<%= form_with(model: specialist, local: true) do |form| %>
<% if specialist.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(specialist.errors.count, "error") %> prohibited this specialist from being saved:</h2>
<ul>
I tried to check previous similar questions but none of them had this error because of this, I am pretty new to Ruby on Rails.
Controller code
class SpecialistsController < ApplicationController
before_action :set_specialist, only: [:show, :edit, :update, :destroy]
# GET /specialists
# GET /specialists.json
def index
#specialists = Specialist.all
end
# GET /specialists/1
# GET /specialists/1.json
def show
end
# GET /specialists/new
def new
#specialist = Specialist.new
end
# GET /specialists/1/edit
def edit
end
# POST /specialists
# POST /specialists.json
def create
#specialist = Specialist.new(specialist_params)
respond_to do |format|
if #specialist.save
format.html { redirect_to #specialist, notice: 'Specialist was successfully created.' }
format.json { render :show, status: :created, location: #specialist }
else
format.html { render :new }
format.json { render json: #specialist.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /specialists/1
# PATCH/PUT /specialists/1.json
def update
respond_to do |format|
if #specialist.update(specialist_params)
format.html { redirect_to #specialist, notice: 'Specialist was successfully updated.' }
format.json { render :show, status: :ok, location: #specialist }
else
format.html { render :edit }
format.json { render json: #specialist.errors, status: :unprocessable_entity }
end
end
end
# DELETE /specialists/1
# DELETE /specialists/1.json
def destroy
#specialist.destroy
respond_to do |format|
format.html { redirect_to specialists_url, notice: 'Specialist was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_specialist
#specialist = Specialist.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def specialist_params
params.require(:specialist).permit(:firstname, :lastname, :phone, :email, :interest)
end
end'

Answer 1

Try the following
On the controller, I think missing something, try the following
def new
#specialist = Specialist.new
end
On the form
<%= form_with model: #specialist, local: true do |form| %>
Or update form like below
<%= form_with scope: :specialist, url: specialists_path, local: true do |form| %>
Rails 5 guides say about validation see here
About form_with you can learn more the following link
Hope it helps