Prototype

User to User relations:

Once a user registers their own accounts, they can follow any other general users, and other general users can also follow them. After users log in to their own accounts, they can see who follow themselves and who they are following. For example, there is a user named Lucy, she follows another user named Kevin. Then, Kevin will appear in Lucy’s following user's page, and Lucy will show up in Kevin’s list of followers.

User to domain relations:

General users can add songs to their own playlists. Users can search songs which they want to listen to by names. After they log in to their own accounts, they can add those songs to their own playlists. For example, user Kevin wants to listen to the song ‘Shape of You ’. He can search this song by its name, then there will be several results show up with name ‘Shape of You’ but different musicians and albums. When Kevin finds the song he looks for, he can add it to his own playlist. Then any time later, when Kevin checks his playlist, the song ‘Shape of You’ will be there. Kevin can also remove songs from his playlists.