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

  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.

  Definition Classes

  root

•  package core

  Definition Classes

  molecule

•  package expression

  Attribute expressions and operations.

  Attribute expressions and operations.
  
  Refine attribute matches with various attribute expressions:

  Person.age(42)                           // equality
  Person.name.contains("John")             // fulltext search
  Person.age.!=(42)                        // negation (or `not`)
  Person.age.<(42)                         // comparison (< > <= >=)
  Person.name("John" or "Jonas")           // OR-logic
  Person.age()                             // apply empty value to retract value(s) in updates
  Person.hobbies.assert("golf")            // add value(s) to card-many attributes
  Person.hobbies.retract("golf")           // retract value(s) of card-many attributes
  Person.hobbies.replace("golf", "diving") // replace value(s) of card-many attributes
  Person.tags.k("en")                      // match values of map attributes by key
  Person.age(Nil)                          // match non-asserted datoms (null)
  Person.name(?)                           // initiate input molecules awaiting input at runtime
  Person.name(unify)                       // Unify attributes in self-joins

  Apply aggregate keywords to aggregate attribute value(s):

  // Aggregates on any attribute type
  Person.age(count).get.map(_.head ==> 3)         // count of asserted `age` attribute values
  Person.age(countDistinct).get.map(_.head ==> 3) // count of asserted distinct `age` attribute values
  Person.age(max).get.map(_.head ==> 38)          // maximum `age` value (using `compare`)
  Person.age(min).get.map(_.head ==> 5)           // maximum `age` value (using `compare`)
  Person.age(rand).get.map(_.head ==> 25)         // single random `age` value
  Person.age(sample).get.map(_.head ==> 27)       // single sample `age` value (when single value, same as random)
  
  // Aggregates on any attribute type, returning multiple values
  Person.age(distinct).get.map(_.head ==> Vector(5, 7, 38)) // distinct `age` values
  Person.age(max(2)).get.map(_.head ==> Vector(38, 7))      // 2 maximum `age` values
  Person.age(min(2)).get.map(_.head ==> Vector(5, 7))       // 2 minimum `age` values
  Person.age(rand(2)).get.map(_.head ==> Stream(5, ?))      // 2 random `age` values (values can re-occur)
  Person.age(sample(2)).get.map(_.head ==> Vector(7, 38))   // 2 sample `age` values
  
  // Aggregates on number attributes
  Person.age(sum).get.map(_.head ==> 50)                  // sum of all `age` numbers
  Person.age(avg).get.map(_.head ==> 16.66666667)         // average of all `age` numbers
  Person.age(median).get.map(_.head ==> 7)                // median of all `age` numbers
  Person.age(stddev).get.map(_.head ==> 15.107025591499)  // standard deviation of all `age` numbers
  Person.age(variance).get.map(_.head ==> 228.2222222222) // variance of all `age` numbers

  Definition Classes

  core

•  package aggregates

  Definition Classes

  expression

• AggregateKeywords
• AggregateKeywordsSchema
• AttrExpressions
• LogicImplicits

molecule.core.expression

AttrExpressions 

Companion object AttrExpressions