# Taken from Tom Nurkkala's Youtube Video on Object-RElational Mapping, which uses KnexJS and ObjectionJS to demonstrate
# Basic SQL relationships

Models in relation
    source: model containing relationMappings definition
    related: model at other end of relation

Relation        Attribute                   FK(s) in
One-toMany      BelongsToOneRelation        Source
                HasManyRelation             Related

Many-to-Many    ManyToManyRelation          Source

One-to-One      BelongsToOneRelation        Source
                HasOneRelation              Related
                HasOneThroughRelation       Join table

See video at around 48:00 for further details.
Also look up Database Relations and also ObjectionJS docs for further details on each one.