Proper use of redirect_to and render

Overview

If you use scaffold in Rails, the create action will be as follows. When saving is successful, redirect_to is used, and when page transition fails, render is used. I will explain this difference.

user_cocntroller.rb


def create
    @user = User.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

Conclusion

redirect_to runs an HTTP request. render just displays the view (= URL doesn't change)

When you want to use redirect_to

When the data update is successful, an HTTP request is executed to move to another page. By doing so, the same data will not be registered by reloading.

When you want to use render

If saving fails, just display the view with an error message. Avoid unnecessarily increasing requests. Since the data has not been registered, there is no problem even if it is reloaded.

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