[RUBY] [Rails] Use validation on a specific controller


I'll write about what to do if you want a particular validation to work only on a particular controller.

Concrete example

For example, when registering user information, consider when you want to register information step by step.

Users table

column type
name string
email string
password string
address string
image string

Page 1: name, email, password 2nd page: address, image

Consider the process of saving name, email, and password, and then saving adress and image.

If you want to make all columns mandatory, just write presence: true in the model and you will get an error when registering the first page. (Because the address and image are empty)

What should I do if I want to use different validations on the first and second pages?


You can use with_options for each action. The image is like giving the model a name for the validation group as with_options on: ~ do and checking the validation using thevalid? (Name)method on the controller.

The specific writing method is as follows. (Please note that some parts are written with a slight break.)


with_options on: :step1 do
  validates :name, presence: true
  validates :email, uniqueness: true
  validates :password, presence: true, length: { minimum: 8 }
  validates :password, confirmation: true

with_options on: :step2 do
  validates :address, presence: true
  validates :image, uniqueness: true

step1 controller

def create
  @user = User.new(user_params)
  if @user.valid?(:step1) && @user.save
    return redirect_to step2_path

  render :new

step2 controller

def update
  @user = User.find(params[:id])
  if @user.valid?(:step2) && @user.update(user_params)
    return redirect_to user_path

  render :edit


If you want to apply all validations at the same time, you need to write as valid? (: Step1) && valid? (: Step2), which is a little troublesome ... (I thought that all with_options would be used just by valid ?, but it didn't work)

By the way, if you want to use create and update properly, please refer to the article here. (Although there is a part that overlaps with this post ...)

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