Relationships

A join is used to combine rows from two or more tables, based on a related column between them.

Declaration

In Forest Admin, relations are defined as fields and are traversable in only one direction.

Join Types

Four join types are available: ManyToOne, ManyToMany, OneToMany, and OneToOne.

Type	Where are the common keys?
ManyToOne	origin[foreignKey] == foreign[foreignKeyTarget]
OneToMany	origin[originKeyTarget] == foreign[originKey]
ManyToMany	origin[originKeyTarget] == through[originKey] && though[foreignKey] == foreign[foreignKeyTarget]
OneToOne	origin[originKeyTarget] == foreign[originKey]