Ruby on Rails ActiveResource not saving resource model properly - ruby-on-rails

Question

ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux],
Rails 4.2.5
I have two projects. from 1st project i am getting data into second project through api.
User model in 1st project:
class User < ActiveRecord::Base
has_many :cars
end
Car model in 1st project:
class Car < ActiveRecord::Base
belongs_to :user
end
Car model(remote) in 2nd project:
class Car < ActiveResource::Base
self.site = 'https://myeasyb-vssram.c9users.io'
self.format = :json
end
Gpstablecontroller(2nd project):
class GpstablesController < ApplicationController
before_action :set_gpstable, only: [:show, :edit, :update, :destroy]
# GET /gpstables
# GET /gpstables.json
def index
#gpstables = Gpstable.all
end
# GET /gpstables/1
# GET /gpstables/1.json
def show
end
# GET /gpstables/new
def new
#gpstable = Gpstable.new
#gpstables = Gpstable.all
end
# GET /gpstables/1/edit
def edit
#gpstables = Gpstable.all
end
# POST /gpstables
# POST /gpstables.json
def create
#cars = Car.all
#gpstable = Gpstable.new(gpstable_params)
#cars.each do |car|
if #gpstable.car_id == car.id
#car = car
end
end
#car.update_attribute(:gpss, #gpstable.device_id)
respond_to do |format|
if #gpstable.save
format.html { redirect_to gpstables_url, notice: 'Gpstable was successfully created.' }
format.json { render :show, status: :created, location: #gpstable }
else
format.html { render :new }
format.json { render json: #gpstable.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /gpstables/1
# PATCH/PUT /gpstables/1.json
def update
respond_to do |format|
if #gpstable.update(gpstable_params)
Car.all.each do |car|
if #gpstable.car_id == car.id.to_json
#car = car
end
if #gpstable.device_id == car.gpss
car.gpss = 0
car.save!
end
end
#car.gpss = #gpstable.device_id
#car.save!
format.html { redirect_to #gpstable, notice: 'Gpstable was successfully updated.' }
format.json { render :show, status: :ok, location: #gpstable }
else
format.html { render :edit }
format.json { render json: #gpstable.errors, status: :unprocessable_entity }
end
end
end
# DELETE /gpstables/1
# DELETE /gpstables/1.json
def destroy
#cars.each do |car|
if #gpstable.device_id == car.gpss
car.gpss = 0
car.user_id = #gpstable.user_id
car.save
end
end
#gpstable.destroy
respond_to do |format|
format.html { redirect_to gpstables_url, notice: 'Gpstable was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_gpstable
#gpstable = Gpstable.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def gpstable_params
params.require(:gpstable).permit(:device_id, :car_id, :user_id)
end
end
when creating gpstable record i want to update Gpss attribute of car model(remote, calling through api).
it is updating gpss attribute.But it is changing all foriegnkeys including user_id attribute of car model to null.
using devise for users in 1st project.

Answer 1

The problem is i am giving user_id to current user_id in car_params. so i was unable to edit this through resource model. so i changed this to create action.
In my first app i have car controller:
def car_params
params.require(:car).permit(:name, :model, :colour, :ac, :gpss, :wifi, :luggage, :cfare, :card, :crfare, :no, :nos, :user_id, {carpicss: []} ).**merge(user: :current_user)**
end
i removed .merge(user: :current_user) from above code.
and added this in create action
def create
#car = Car.new(car_params)
#car.card=" #{#car.name} : #{#car.no}"
#car.user_id=current_user.id #added here to save current user_id
respond_to do |format|
if #car.save
format.html { redirect_to cars_path, notice: 'Car was successfully created.' }
format.json { render :show, status: :created, location: cars_path }
else
format.html { render :new }
format.json { render json: #car.errors, status: :unprocessable_entity }
end
#car.reload
end
end