One Model and two controller validation Ruby on Rails? - ruby-on-rails

Question

One thing that confuses me the most is when doing validation in one model with two controllers. I have a login system which register and logs users in. There both use the same model but both does not use the same amount of HTML widgets. One controller contains password, retype password, user name, first & second name and so on. The second controller uses only the user name and password fields. How would you do validation in the same model for this situation?
Thank you
here is the controller that register new users:
class UsersController < ApplicationController
def new
#user = User.new
end
def create
#user = User.new(user_params)
if #user.save
session[:user_id] = #user.id
redirect_to '/cool'
else
#user = Newuser.new
#user.valid?
#user.errors.messages
render 'new'
end
end
private
def user_params
params.require(:user).permit(:name, :email, :password, :salt, :firstname, :secondname, :address, :postcode)
end
end
second controller:
class LoginsController < ApplicationController
before_filter :authorize
def index
#rentals = Rental.where(user_id: current_user.id).limit(5)
#buys = Buy.where(user_id: current_user.id).limit(5)
#users = User.where(id: current_user.id)
#buyGames = BuyGame.where(user_id: current_user.id).limit(5)
end
def destroy
#user = User.find(params[:id])
#user.destroy
redirect_to '/logout'
end
def edit
#user = User.find(params[:id])
end
def update
#user = User.find(params[:id])
if #user.update(account_params)
redirect_to '/cool'
else
render 'edit'
end
end
private
def account_params
params.require(:user).permit(:name, :email, :password, :salt, :firstname, :secondname, :address, :postcode)
end
end
Here is my model:
class User < ApplicationRecord
has_secure_password
end

Answer 1

One way to go is to remove validations from the model and put them in form objects. For this case, you'll have two form objects, each with its own set of validations. And you use the appropriate one in respective controllers. Something along these lines:
# logins_controller
def update
login_form = FormObjects::LoginForm.new(login_params)
if login_form.valid?
redirect_to '/cool'
else
render 'edit'
end
end
# users controller
def create
signup_form = FormObjects::SignupForm.new(user_params)
if signup_form.save
redirect_to '/cool'
else
render 'new'
end
end
# signup_form
module FormObjects
class SignupForm
include ::ActiveMode::Model
validate_presense_of :email, :password, :password_confirmation, :address, :whatever_else
def save
# create user here
end
end
end
# login_form
module FormObjects
class LoginForm
include ::ActiveMode::Model
validate_presense_of :email, :password
end
end

Answer 2

You can simply specify validations on actions, that is:
validates :first_name, presence: true, on: :create # which won't validate presence of first name on update or any other action

Answer 3

I believe the trick you are looking for is to define validation actions on create/update of the model. Something roughly along these lines:
class User < ActiveRecord::Base
# These are example validations only; replace with your actual rules.
validates :password, confirmation: true
validates_presence_of :username
validates :first_name, presence: true, format: {with: /.../}, on: create
validates :last_name, presence: true, format: {with: /.../}, on: create
end
...However, I am unclear why you would want to do this in your specific example. It would be advisable to always run all validation checks on fields like first_name, to help maintain data integrity.