Relationship fields

Music and artist

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How can you describe the genre-song relationship in Django models? Moreover, a song can only have one genre, and one genre can belong to any number of songs. Below are options of how you can create a field for the Song model:

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genre_id = models.ForeignKey(Genre, on_delete=models.CASCADE)

genre_id = models.ForeignKey(Genre)

genre_id = models.ForeignKey(Song, on_delete=models.CASCADE)

genre_id = models.ForeignKey('Genre', on_delete=models.CASCADE)

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