User slugs

gistfile1.rb

# User.rb

class User <ActiveRecord::Base
  before_save :generate_slug
  
  # [...]
  
    def self.from_omniauth(auth)
    where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
      user.provider = auth.provider
      user.uid = auth.uid
      user.first_name = auth.info.first_name
      user.last_name = auth.info.last_name
      user.email = auth.info.email
      if auth.provider == "facebook"
        user.image = auth.info.image + "?type=large"
        user.token = auth.credentials.token
        user.expires_at = Time.at(auth.credentials.expires_at)
      end
      user.save!
    end
    # This is here so that the "provider" is not taken into account when seraching for users.
    # This way, users from different providers will not have the same slug.
    # But not it doesn't work with my 'sessions#new' action
    # u = User.last
    # u.generate_slug
    # u.save!
    # return User.where(provider: auth.provider, uid: auth.uid).first
  end
  
    def generate_slug
    the_slug = to_slug(self.first_name.to_s + self.last_name.to_s)
    object = User.find_by slug: the_slug
    count = 2
      while object && object !=self
        the_slug = append_suffix(the_slug, count)
        object = self.class.find_by slug: the_slug
        count += 1 
      end
    self.slug = the_slug.downcase
  end

  def append_suffix(str, count)
    if str.split('-').last.to_i != 0
      return str.split('-').slice(0...-1).join('-') + "-" + count.to_s
    else
      return str + "-" + count.to_s
    end
  end

  def to_slug(name)
    str = name.strip
    str.gsub! /\s*[^A-Za-z0-9]\s*/, '-'
    str.gsub! /-+/, '-'
    str.gsub! /^-+|-+$/, ''
    str.downcase
  end
  
end

# Sessions_controller.rb
class SessionsController < ApplicationController

  def new
  end

  def create
    user = User.from_omniauth(env["omniauth.auth"])
    session[:user_id] = user.id
    if user
      redirect_to user_path(current_user)
    else 
      redirect_to :back
    end
  end
  
end