I have the following query that inserts data into a many-to-many join table
INSERT INTO playlist_genre(playlist_id, genre_id)
VALUES (${playlistId}, ${genre1Id}),
(${playlistId}, ${genre2Id}),
(${playlistId}, ${genre3Id})
);
However the problem I've come to is that the values genre2Id
and genre3Id
are not required by the user so could either be an INTEGER
or NULL
.
I am trying to find a way to write this same query but so it only inserts if a value is present. Both columns have NOT NULL
constraints.
Edit:
Here is my Playlist class
class Playlist {
constructor(playlist) {
// required fields
this.title = playlist.title;
this.playlistType = playlist.playlistType;
this.userId = playlist.userId;
this.numberOfTracks = playlist.numberOfTracks;
this.lengthInSeconds = playlist.lengthInSeconds;
this.genre1Id = playlist.genre1Id;
// not required fields
this.genre2Id = playlist.genre2Id || null;
this.genre3Id = playlist.genre3Id || null;
this.description = playlist.description || null;
this.releaseDate = playlist.releaseDate || null;
}
save() {
return new Promise((resolve, reject) => {
db.one(sqlCreatePlaylist, this)
.then((insertedPlaylist) => {
// Here is where i want to use insertedPlaylist's id
// to insert data into 'playlist_genre' table
resolve(insertedPlaylist);
})
.catch(error => reject(error));
});
}
Here is what sqlCreatePlaylist looks like
INSERT INTO playlists(
user_id,
title,
playlist_type,
number_of_tracks,
duration,
description,
release_date
)
VALUES(
${userId},
${title},
${playlistType},
${numberOfTracks},
${lengthInSeconds},
${description},
${releaseDate}
)
RETURNING *;