Why Rails cannot add a new record to database? - ruby-on-rails

Question

I'm using PostgreSQL. I have the next form on /main URL(localhost:3000/main):
=form_for(#car) do |b|
.col-xs-2= b.text_field(:type, class: "form-control", placeholder: "Type")
= b.submit('Buy', class: "btn btn-default")
In my Controller:
def main
#car = Car.new
end
def new
#car = Car.new
end
def create
#car = Car.new(car_params)
respond_to do |format|
if #car.save
format.html { redirect_to #car, notice: 'Car was successfully ordered.' }
format.json { render :show, status: :created, location: #car }
else
format.html { render :new }
format.json { render json: #car, status: :unprocessable_entity }
end
end
end
where
def car_params
params.require(:car).permit(:type)
end
I checked my code 100 times and it seems everything okay, but I cannot add a new record to my database table. Can anyone help me why it happens? What is the problem in my code?

Answer 1

You forgot to save the car. Although you declare and set the object, you forgot to save it in the database.
You should do it by adding the following line:
#car.save
in the create action

Answer 2

A few things missing your create method. Need to add ".new" where the car variable is being set, and then also ".save" where the if statement is, I believe that should do it.
Create method should be like below
def create
#car = Car.new(car_params)
respond_to do |format|
if #car.save
format.html { redirect_to #car, notice: 'Car was successfully ordered.' }
format.json { render :show, status: :created, location: #car }
else
format.html { render :new }
format.json { render json: #car, status: :unprocessable_entity }
end
end

Answer 3

#car = Car(car_params) is not correct.
You need to do #car = Car.new(car_params)

Answer 4

First thing you need to do is to replace this line in your create method.
#car = Car(car_params)
with this line
#car = Car.new(car_params)
Because we need to initialize the record of car with the params permitted. After that you have to call #car.save which will return a boolean.
So you can check it in if condition like
if #car.save
Hope this solves your problem.