Packages

•  package root

  

  

  Documentation/API for the Molecule library - a meta DSL for the Datomic database.

  Manual | scalamolecule.org | Github | Forum

  Definition Classes

  root

•  package molecule

  Molecule library - a Scala meta-DSL for the Datomic database.

  Molecule library - a Scala meta-DSL for the Datomic database.

  See api package for various api imports to start using Molecule.

  Sub-packages

  api		Molecule API.
  ast		Internal Molecule ASTs.
  boilerplate		Internal interfaces for auto-generated DSL boilerplate code.
  composition		Builder methods to compose molecules.
  exceptions		Exceptions thrown by Molecule.
  expression		Attribute expressions and operations.
  facade		Molecule facades to Datomic.
  factory		Implicit macro methods `m` to instantiate molecules from custom DSL molecule constructs.
  input		Input molecules awaiting input.
  macros		Internal macros generating molecule code from custom DSL molecule constructs.
  generic		Interfaces to generic information about datoms and Datomic database.
  ops		Internal operational helpers for transforming DSL to molecule.
  schema		Schema definition DSL.
  transform		Internal transformers from DSL to Model/Query/Transaction.
  util		Internal Java database functions for Datomic.

  Definition Classes

  root

•  package input

  Input molecules awaiting input.

  Input molecules awaiting input.
  
  Input molecules are molecules that awaits one or more inputs at runtime. When input value is applied, the input molecule is resolved and a standard molecule is returned that we can then call actions on.
  
  Input molecule queries are cached by Datomic. So there is a runtime performance gain in using input molecules. Furthermore, input molecules are a good fit for re-use for queries where only a few parameters change.
  
  Input molecules can await 1, 2 or 3 inputs and are constructed by applying the ? marker to attributes. If one marker is applied, we get a InputMolecule_1, 2 inputs creates an InputMolecule_2 and 3 an InputMolecule_3.
  
  The three input molecule interfaces come in arity-versions corresponding to the number of non-?-marked attributes in the input molecule. Let's see a simple example:

  // Sample data
  Person.name.age insert List(("Ben", 42), ("Liz", 34))
  
  // Input molecule created at compile time. Awaits a name of type String
  val ageOfPersons: InputMolecule_1.InputMolecule_1_01[String, Int] = m(Person.name_(?).age)
  
  // Resolved molecule. "Ben" input is matched against name attribute
  val ageOfPersonsNamedBen: Molecule.Molecule01[Int] = ageOfPersons.apply("Ben")
  
  // Calling action on resolved molecule.
  // (Only age is returned since name was marked as tacit with the underscore notation)
  ageOfPersonsNamedBen.get === List(42)
  
  // Or we can re-use the input molecule straight away
  ageOfPersons("Liz").get === List(34)

  Definition Classes

  molecule

•  package exception

  Definition Classes

  input

• InputMolecule
• InputMolecule_1
• InputMolecule_2
• InputMolecule_3

molecule.input

InputMolecule_1

Companion trait InputMolecule_1