Packages

t

molecule.boilerplate.api

CompositeInitBase

trait CompositeInitBase extends AnyRef

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:

for {
  // Arity 1 + 1
  _ <- m(Article.name + Tag.category).get.map(_ ==> List(
    ("Battle of Waterloo", "History")
  ))

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

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

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

  // Arity 3 + 2 etc...
  _ <- m(Article.name.author.editor + Tag.category.weight).get.map(_ ==> List(
    (("Battle of Waterloo", "Ben Bridge", "Joe Moe"), ("History", 5))
  ))
} yield ()
Source
CompositeInit_.scala
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