Packages

trait CompositeInit extends NS

Build composite molecule.

Composite molecules model entities with attributes from different namespaces that are not necessarily related. Each group of attributes is modelled by a molecule and the "sub-molecules" are tied together with ~ methods to form a composite molecule.

The attributes of the first sub-molecule are tied together in a tuple of its own before being merged with the tuple of attribute values of the second sub-molecule. If any of the sub-molecules are of arity-1, then no tuple is created:

// Arity 1 + 1
m(Article.name ~ Tag.category).get === List(
  ("Battle of Waterloo", "History")
)

// Arity 1 + 2
m(Article.name ~ Tag.category.weight).get === List(
  ("Battle of Waterloo", ("History", 5))
)

// Arity 2 + 1
m(Article.name.author ~ Tag.category).get === List(
  (("Battle of Waterloo", "Ben Bridge"), "History")
)

// Arity 2 + 2
m(Article.name.author ~ Tag.category.weight).get === List(
  (("Battle of Waterloo", "Ben Bridge"), ("History", 5))
)

// Arity 3 + 2 etc...
m(Article.name.author.editor ~ Tag.category.weight).get === List(
  (("Battle of Waterloo", "Ben Bridge", "Joe Moe"), ("History", 5))
)

To insert composite data, see CompositeInserts.

Source
CompositeInit.scala
See also

Manual | Tests

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