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trait Molecule_In_2_Factory2 extends AnyRef

Factory methods to create input molecules of arity 1-22 awaiting 2 inputs.

Molecules

Molecules are type-safe custom Scala models of data structures in a Datomic database.

Molecules are build with your custom meta-DSL that is auto-generated from your Schema Definition file. Calling m on your modelled DSL structure lets Molecule macros create a custom molecule, ready for retrieving or manipulating data in the Datomic database.

Each molecule consists of one or more attributes that can have values or expressions applied. The arity of a molecule is determined by the number of attributes that will return data when the molecule is queried against the Datomic database. Attributes returning data are called "output attributes".

Input molecules

Input molecules awaiting 2 inputs have one attribute with ? applied to mark that it awaits inputs at runtime for those attributes. Once the input molecule has been resolved with inputs, a normal molecule is returned that we can query against the Datomic database.

For brevity, only arity 1 and 2 method signatures are shown. Arity 3-22 follow the same pattern.

Source
Molecule_In_2_Factory.scala
See also

Manual

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in2_out2, in3_out2, Molecule_In_2_Factory2
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  12. macro def m[I1, I2, A, B](dsl: IN2_02[I1, I2, A, B]): InputMolecule_2_02[I1, I2, A, B]

    Macro creation of input molecule awaiting 2 inputs from user-defined DSL structure with 2 output attributes (arity 2).

    Macro creation of input molecule awaiting 2 inputs from user-defined DSL structure with 2 output attributes (arity 2).

    Molecules are build by adding one or more attributes to an initial namespace like Person from the example below.

    Applying the ? marker to attributes changes the semantics of a molecule to become an "input molecule" that awaits input at runtime for the attributes marked with ?.

    Once the input molecule has been resolved with input, we can call various actions on it, like get that retrieves matching data from the database.

    // Apply `?` to `age` and `score` attributes to create input molecule.
// Input attributes can be tacit or mandatory
val personAgeScore = m(Person.name.age_(?).score(?))

// At runtime `age` and `score` values are applied to get the Person's name and score.
// Since `score` was mandatory (without underscore), its value is also returned.
personAgeScore(42, 7).get.head === ("Ben", 7)
    I1

    Type of input attribute 1 (age: Int)

    I2

    Type of input attribute 2 (score: Int)

    A

    Type of output attribute 1 (name: String)

    B

    Type of output attribute 2 (score: Int)

    dsl

    User-defined DSL structure modelling the input molecule

    returns

    Input molecule ready to be resolved

  13. macro def m[I1, I2, A](dsl: IN2_01[I1, I2, A]): InputMolecule_2_01[I1, I2, A]

    Macro creation of input molecule awaiting 2 inputs from user-defined DSL structure with 1 output attribute (arity 1).

    Macro creation of input molecule awaiting 2 inputs from user-defined DSL structure with 1 output attribute (arity 1).

    Molecules are build by adding one or more attributes to an initial namespace like Person from the example below.

    Applying the ? marker to attributes changes the semantics of a molecule to become an "input molecule" that awaits input at runtime for the attributes marked with ?.

    Once the input molecule has been resolved with input, we can call various actions on it, like get that retrieves matching data from the database.

    // Apply `?` to `age` and `score` attributes to create input molecule.
val personAgeScore = m(Person.name.age_(?).score_(?))

// At runtime `age` and `score` values are applied to get the Person's name.
personAgeScore(42, 7).get.head === "Ben"

    For arity-many molecules, data structures are returned as tuples. But for arity-1 molecules (like the example having only 1 output attribute, name) there's no need for a tuple, so values type-safely matching the attribute are returned directly in the list.

    I1

    Type of input attribute 1 (age: Int)

    I2

    Type of input attribute 2 (score: Int)

    A

    Type of output attribute 1 (name: String)

    dsl

    User-defined DSL structure modelling the input molecule

    returns

    Input molecule ready to be resolved

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