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 generic
    Definition Classes
    molecule
  • package datom

    Generic Datom attribute interfaces of all arities.

    Generic Datom attribute interfaces of all arities.

    "Generic attributes" are special pre-defined attributes that can be combined with custom attributes in molecules to return meta data:

    // Get id of Ben entity with `e`
Person.e.name.get.head === (benEntityId, "Ben")

// When was Ben's age updated? Using `txInstant`
Person(benEntityId).age.txInstant.get.head === (42, <April 4, 2019>) // (Date)

// With a history db we can access the transaction number `t` and
// assertion/retraction statusses with `op`
Person(benEntityId).age.t.op.getHistory === List(
  (41, t1, true),  // age 41 asserted in transaction t1
  (41, t2, false), // age 41 retracted in transaction t2
  (42, t2, true)   // age 42 asserted in transaction t2
)

    Available generic attributes:

    • e - Entity id (Long)
    • a - Full attribute name like ":Person/name" (String)
    • v - Value of Datoms (Any)
    • t - Transaction pointer (Long/Int)
    • tx - Transaction entity id (Long)
    • txInstant - Transaction wall clock time (java.util.Date)
    • op - Operation status: assertion (true) / retraction (false)
    Definition Classes
    generic
    See also

    Tests for more generic attribute query examples.

  • Datom
  • Datom_0
  • Datom_1
  • Datom_10
  • Datom_11
  • Datom_12
  • Datom_13
  • Datom_14
  • Datom_15
  • Datom_16
  • Datom_17
  • Datom_18
  • Datom_19
  • Datom_2
  • Datom_20
  • Datom_21
  • Datom_22
  • Datom_3
  • Datom_4
  • Datom_5
  • Datom_6
  • Datom_7
  • Datom_8
  • Datom_9

trait Datom extends AnyRef

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Type Members

  1. final class a[Ns, In] extends OneString[Ns, In] with Indexed

    (Partition)-Namespace-prefixed attribute name (":part_Ns/attr")

  2. final class e[Ns, In] extends OneLong[Ns, In] with Indexed

    Entity id (Long)

  3. final class op[Ns, In] extends OneBoolean[Ns, In] with Indexed

    Transaction operation: assertion (true) or retraction (false)

  4. final class t[Ns, In] extends OneLong[Ns, In] with Indexed

    Transaction point in time t (Long/Int)

  5. final class tx[Ns, In] extends OneLong[Ns, In] with Indexed

    Transaction entity id (Long)

  6. final class txInstant[Ns, In] extends OneDate[Ns, In] with Indexed

    Transaction wall-clock time (Date)

  7. final class v[Ns, In] extends OneAny[Ns, In] with Indexed

    Datom value (Any)

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