Foo:
  tableName: foo
  columns:
    id:
      type: integer
      primary: true
  relations:
     Bar:
       local: id
       foreign: foo_id

Bar:
  tableName: bar
  columns:
    id:
      type: integer
      primary: true
    foo_id:
      type: integer
  relations:
     Foo:
       local: foo_id
       foreign: id