Packages

t

molecule.core.generic

GenericAVET

trait GenericAVET extends AnyRef

AVET Index.

"The AVET index provides efficient access to particular combinations of attribute and value." (from Datomic documentation)

Access the AVET Index in Molecule by instantiating an AVET object with one or more arguments and then add generic attributes:

// Create AVET Index molecule with 1 entity id argument
AVET(":Person/age").e.v.t.get === List(
  (e1, 42, t2),
  (e2, 37, t5)
  (e3, 14, t7),
)

// Narrow search with multiple arguments
AVET(":Person/age", 42).e.t.get === List( (e1, t2) )
AVET(":Person/age", 42, e1).e.v.get === List( (e1, t2) )
AVET(":Person/age", 42, e1, t2).e.v.get === List( (e1, t2) )

The AVET Index can be filtered by a range of values between from (inclusive) and until (exclusive) for an attribute:

AVET.range(":Person/age", Some(14), Some(37)).v.e.t.get === List(
  (14, e4, t7) // 14 is included in value range
               // 37 not included in value range
               // 42 outside value range
)

// If `from` is None, the range starts from the beginning
AVET.range(":Person/age", None, Some(40)).v.e.t.get === List(
  (14, e3, t7),
  (37, e2, t5),
)

// If `until` is None, the range goes to the end
AVET.range(":Person/age", Some(20), None).v.e.t.get === List(
  (37, e2, t5),
  (42, e1, t2)
)

Index attributes available:

  • 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)
Source
GenericAVET.scala
Note

The Molecule Index API's don't allow returning the whole Index/the whole database. So omitting arguments constructing the Index object (like AVET.a.v.e.t.get) will throw an exception.
Please use Datomics API if you need to return the whole database Index:
conn.db.datoms(datomic.Database.AVET)

from and until cannot both be None since Molecule doesn't allow returning all datoms.

Linear Supertypes
AnyRef, Any
Known Subclasses
api, api, in1_out1, in1_out10, in1_out11, in1_out12, in1_out13, in1_out14, in1_out15, in1_out16, in1_out17, in1_out18, in1_out19, in1_out2, in1_out20, in1_out21, in1_out22, in1_out3, in1_out4, in1_out5, in1_out6, in1_out7, in1_out8, in1_out9, in2_out1, in2_out10, in2_out11, in2_out12, in2_out13, in2_out14, in2_out15, in2_out16, in2_out17, in2_out18, in2_out19, in2_out2, in2_out20, in2_out21, in2_out22, in2_out3, in2_out4, in2_out5, in2_out6, in2_out7, in2_out8, in2_out9, in3_out1, in3_out10, in3_out11, in3_out12, in3_out13, in3_out14, in3_out15, in3_out16, in3_out17, in3_out18, in3_out19, in3_out2, in3_out20, in3_out21, in3_out22, in3_out3, in3_out4, in3_out5, in3_out6, in3_out7, in3_out8, in3_out9, out1, out10, out11, out12, out13, out14, out15, out16, out17, out18, out19, out2, out20, out21, out22, out3, out4, out5, out6, out7, out8, out9
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  20. object AVET extends AVET_0_0_L0[AVET_, Init] with FirstNS

    AVET Index object to start AVET Index molecule.

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