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Rails Callback: Automatically Normalize Usernames Before Save

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                  class User < ApplicationRecord
  before_save :normalize_username

  validates :username, presence: true, uniqueness: true

  private

  def normalize_username
    self.username = username.strip.downcase if username.present?
  end
end

                  class UsersController < ApplicationController
  def create
    @user = User.new(user_params)

    if @user.save
      redirect_to @user, notice: "User created successfully!"
    else
      render :new
    end
  end

  private

  def user_params
    params.require(:user).permit(:username, :email, :password, :password_confirmation)
  end
end

This snippet ensures usernames are consistently formatted by automatically trimming spaces and converting them to lowercase before saving. The before_save callback in the User model prevents duplicates caused by case differences. The UsersController handles user creation. One challenge is ensuring uniqueness validation isn't case-sensitive—Rails handles this at the database level if indexes are properly set. This technique improves user experience and avoids mismatches in authentication.

Martin Sojka

More from Martin Sojka

Rails Callback: Automatically Normalize Usernames Before Save

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More from Martin Sojka