Rails Association, undefined method - ruby-on-rails

Question

I'm working on two simple model
class Permit < ApplicationRecord
belongs_to :user, optional: true
validates :user_id, presence: true
end
class User < ApplicationRecord
has_many :permits
has_secure_password
end
In rail console, I am doing the following
user = User.find(10)
Which assign the a User object to user.
But when I want to create a permit for the user it gives this error
NoMethodError in PermitsController#create
undefined method `Permit' for #<User:0xaaa3528>
How to solve this problem? Thanks!
This is my permit_controller which the problem I believe is in CREATE action
class PermitsController < ApplicationController
before_action :set_permit, only: [:show, :destroy]
def index
#permits = Permit.all
end
def new
#permits = Permit.new
end
def create
#permits = user.permits.create(permit_params)
if #permits.save
redirect_to #permits
else
redirect_to contact_path
end
end
def destroy
Permit.destroy_all(user_id: 1)
respond_to do |format|
format.html { redirect_to users_url, notice: 'Permit was successfully canceled.' }
format.json { head :no_content }
end
end
def show
#permits = Permit.find(params[:id])
end
def update
respond_to do |format|
if #permits.update(user_params)
format.html { redirect_to #user, notice: 'Permit was successfully updated.' }
format.json { render :show, status: :ok, location: #user }
else
format.html { render :edit }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_permit
#permits = Permit.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def permit_params
params.require(:permit).permit(:vehicle_type, :name, :studentid, :department, :carplate, :duration, :permitstart, :permitend)
end
end
Permit/new/html.erb
<% provide(:title, 'New Permit') %>
<h1>Permit Application</h1>
<div class="row">
<div class="col-md-6 col-md-offset-3">
<%= form_for(#permits) do |f| %>
<%= f.label :"Vehicle" %>
<%= f.text_field :vehicle_type, class: 'form-control' %>
<%= f
.label :"License Plate" %>
<%= f.text_field :carplate, class: 'form-control' %>
<%= f.label :"Student ID" %>
<%= f.text_field :studentid, class: 'form-control' %>
<%= f.label :name %>
<%= f.text_field :name, class: 'form-control' %>
<%= f.label :"Department of applicant" %>
<%= f.text_field :department, class: 'form-control' %>
<%= f.label :permit_start %>
<%= f.date_select :permitstart, class: 'form-control' %>
<%= f.label :permit_end %>
<%= f.date_select :permitend, class: 'form-control' %>
<%= f.submit "Submit", class: "btn btn-primary" %>
<% end %>

Answer 1

You have to create the permit as follows:
user.permits.create(..)

Answer 2

You set before_action :set_permit, only: [:show, :destroy], that mean you can only use #permits (should be singular) in those 2 methods, I see you use #permits in update. Didn't see you permit user_id for permit_params.
In create #permits = user.permits.create(permit_params) you didn't declare user.
You set before_action :set_permit, only: [:show, :destroy], so why don't #permits.destroy
belongs_to :user, optional: true
validates :user_id, presence: true
optional: true but user_id with presence: true, isn't it conflict? how do you require an optional?
You have more bugs to deal thank you thought.
Good luck

Answer 3

I'm not a rails expert but i'll try to help out with this and try to work out the possible places of errors.
In your schema ensure that in your Permits table you have a user_id column.
Test out that the association works in rails console. user = User.first
user.permits
If it works, great it means your association is working.
Test your permits create function on its own first without including "User" in it. Add the user aspect in only after your permits is fully functioning!
Hope it helps! Cheers