Is it idiomatic to make a join entity?

When I say join entity I mean whatever the datomic equivalent to a SQL join table is. Say I have a parent entity with attribute name and I have a child entity with attribute name . parent is a in a many to many relationship with child as each parent can have multiple children and each child can have two parents.

If I were using SQL I'd create a join table family that includes the foreign keys to parent and child ; however with datomic, I have the option to pick either parent or child to give a reference attribute to the other with a many cardinality. Is this the favored approach over creating a new entity? What if family has attributes that are more associated with the family as a whole than individual parents/children; for example, a family priority number?

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Datomic's flexible schema would allow you to model this either way. If you need to model attributes for the family itself, though, it makes more sense for family to be a reified entity.

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