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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]