old_contents: from flask import jsonify
  
  from soundem import app
  from .models import Artist, Album, Song, Favorite
  
  
  @app.route('/api/v1/artists', methods=['GET'])
  def get_artists():
      artists = []
  
      for artist in Artist.query.all():
          artists.append({
              'id': artist.id,
              'name': artist.name,
              'bio': artist.bio,
              'albums': [album.id for album in artist.albums.all()]
          })
  
      return jsonify({'artists': artists})
  
  
  @app.route('/api/v1/albums', methods=['GET'])
  def get_albums():
      albums = []
  
      for album in Album.query.all():
          albums.append({
              'id': album.id,
              'name': album.name,
              'songs': [song.id for song in album.songs.all()]
          })
  
      return jsonify({'albums': albums})
  
  
  @app.route('/api/v1/songs', methods=['GET'])
  def get_songs():
      songs = []
  
      for song in Song.query.all():
          favorite = Favorite.query.filter_by(song=song).first()
          songs.append({
              'id': song.id,
              'name': song.name,
              'album': song.album.id,
              'favorite': True if favorite else False
          })
  
      return jsonify({'songs': songs})
  
new_contents: from flask import jsonify, request
  
  from soundem import app, db
  from .models import Artist, Album, Song, Favorite, user_datastore
  
  
  @app.route('/api/v1/register', methods=['POST'])
  def register():
      data = request.get_json()
      email = data.get('email')
      password = data.get('password')
      errors = {}
  
      if not email:
          errors['email'] = 'Field is required.'
  
      if not password:
          errors['password'] = 'Field is required.'
  
      existing_user = user_datastore.find_user(email=email)
  
      if existing_user:
          errors['email'] = 'Email is already taken'
  
      if errors:
          return jsonify({'errors': errors}), 400
  
      user = user_datastore.create_user(email=email, password=password)
      db.session.commit()
  
      user_data = {
          'id': user.id,
          'email': user.email,
          'active': user.active
      }
  
      return jsonify({'user': user_data}), 201
  
  
  @app.route('/api/v1/artists', methods=['GET'])
  def get_artists():
      artists = []
  
      for artist in Artist.query.all():
          artists.append({
              'id': artist.id,
              'name': artist.name,
              'bio': artist.bio,
              'albums': [album.id for album in artist.albums.all()]
          })
  
      return jsonify({'artists': artists})
  
  
  @app.route('/api/v1/albums', methods=['GET'])
  def get_albums():
      albums = []
  
      for album in Album.query.all():
          albums.append({
              'id': album.id,
              'name': album.name,
              'songs': [song.id for song in album.songs.all()]
          })
  
      return jsonify({'albums': albums})
  
  
  @app.route('/api/v1/songs', methods=['GET'])
  def get_songs():
      songs = []
  
      for song in Song.query.all():
          favorite = Favorite.query.filter_by(song=song).first()
          songs.append({
              'id': song.id,
              'name': song.name,
              'album': song.album.id,
              'favorite': True if favorite else False
          })
  
      return jsonify({'songs': songs})
  
subject: Implement register user endpoint