[Ruby on Rails] Pass the parameters divided by date_select to FormObject.

I think that FormObject is used when you want to update multiple models by submitting one form. (If you want to know about FormObject, click here: [Rails] Please use FormObject)

I was in trouble because I couldn't pass the parameters divided by date_select to that FormObject as it is. After declaring ʻinclude ActiveRecord :: AttributeAssignment` to FormObject, I was able to pass them all together, so I would like to introduce them below. I will.

Description

The situation is when you register your birthday on the new registration screen.

Press the CreateUser button on the image to run the controller's create action. Divided parameters using the StrongParameter mechanism in the user_params method <ActionController :: Parameters {"birthday (1i) "=>" 2020 "," birthday (2i) "=>" 7 "," birthday (3i) "=>" 13 "} permitted: Get true>.

app/controllers/users_controller.rb

class UsersController < ApplicationController
  before_action :set_user, only: [:show, :edit, :update, :destroy]

  # GET /users
  # GET /users.json
  def index
    @users = User.all
  end

  # GET /users/1
  # GET /users/1.json
  def show
  end

  # GET /users/new
  def new
    @user = Form.new
  end

  # GET /users/1/edit
  def edit
  end

  # POST /users
  # POST /users.json
  def create
    @user = Form.new(user_params)
    respond_to do |format|
      if @user.save
        format.html { redirect_to @user, notice: 'User was successfully created.' }
        format.json { render :show, status: :created, location: @user }
      else
        format.html { render :new }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /users/1
  # PATCH/PUT /users/1.json
  def update
    respond_to do |format|
      if @user.update(user_params)
        format.html { redirect_to @user, notice: 'User 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

  # DELETE /users/1
  # DELETE /users/1.json
  def destroy
    @user.destroy
    respond_to do |format|
      format.html { redirect_to users_url, notice: 'User was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_user
      @user = User.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def user_params
      params.require(:user).permit(:birthday)
    end
end

app/forms/form.rb

class Form
  include ActiveModel::Model
  include ActiveModel::Attributes

  attribute :birthday, :date

  def to_model
    User.new(birthday: birthday)
  end

  def save
    return false if invalid?
    to_model.save
  end
end

As stated in @user = Form.new (user_params), If you try to pass the divided parameters by the initial value of FormObject, an error will occur because it is divided. <ActionController :: Parameters {"birthday (1i) "=>" 2020 "," birthday (2i) "=>" 7 "," birthday (3i) "=>" 12 "} permitted: true> I want to pass it as a birthday parameter.

So, if you declare ʻinclude ActiveRecord :: AttributeAssignment`, it will pass the divided parameters together to attribute. case being settled.

app/forms/form.rb

class Form
  include ActiveModel::Model
  include ActiveModel::Attributes
  #add to
  include ActiveRecord::AttributeAssignment

  attribute :birthday, :date

  def to_model
    User.new(birthday: birthday)
  end

  def save
    return false if invalid?
    to_model.save
  end
end