Composite_In_2_Factory2

Companion trait Composite_In_2_Factory2

object Composite_In_2_Factory2 extends Composite_In_2_Factory2

Source: Composite_In_2_Factory.scala

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macro def m[I1, I2, T1, T2](dsl: Composite_In_2_02[I1, I2, T1, T2]): InputMolecule_2_02[I1, I2, T1, T2]
Macro creation of composite input molecule awaiting 2 inputs from user-defined DSL with 2 output groups (arity 2).
Macro creation of composite input molecule awaiting 2 inputs from user-defined DSL with 2 output groups (arity 2).

The builder pattern is used to add one or more attributes to an initial namespace like Person from the example below. Further non-related attributes can be tied together with the + method to form "composite molecules" that is basically just attributes sharing the same entity id.

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

Once the composite input molecule models the desired data structure and 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 composite input molecule
val personsAgeScore = m(Person.name.age_(?) + Tag.score(?))

// At runtime, `age` and `score` values are applied to get the Person's name
personsAgeScore(42, 7).get.head === ("Ben", 7)
```
Composite input molecules of arity 2 has two sub-molecules with output attribute(s). If a sub-molecule has multiple output attributes, a tuple is returned, otherwise just the single value. The two groups of either a single type or tuple are then tied together in an outer composite tuple:
```
Composite input molecule          Composite type (2 output groups)

A.a1(?)    + B.b1(?)        =>    (a1, b1)
A.a1(?)    + B.b1(?).b2     =>    (a1, (b1, b2))
A.a1.a2(?) + B.b1(?)        =>    ((a1, a2), b1)
A.a1.a2(?) + B.b1(?).b2     =>    ((a1, a2), (b1, b2)) etc...

We could even have additional non-output sub-molecules:
A.a1.a2 + B.b1(?).b2 + C.c1_(?)     =>    ((a1, a2), (b1, b2)) etc...
```
Translating into the example:
```
m(Person.name(?)     + Tag.score(?)      )("Ben", 7).get.head === ("Ben", 7)
m(Person.name(?)     + Tag.score(?).flags)("Ben", 7).get.head === ("Ben", (7, 3))
m(Person.name.age(?) + Tag.score(?)      )(42, 7)   .get.head === (("Ben", 42), 7)
m(Person.name.age(?) + Tag.score(?).flags)(42, 7)   .get.head === (("Ben", 42), (7, 3))

m(Person.name.age +
  Tag.score(?).flags +
  Cat.name_(?))(7, "pitcher").get.head === (("Ben", 42), (7, 3))
```
I1
Type of input attribute 1 (name: String or age: Int)
I2
Type of input attribute 2 (score: Int)
T1
Type of output group 1
T2
Type of output group 2
dsl
User-defined DSL structure modelling the composite input molecule awaiting 2 inputs
returns
Composite input molecule awaiting 2 inputs
Definition Classes
Composite_In_2_Factory2
macro def m[I1, I2, T1](dsl: Composite_In_2_01[I1, I2, T1]): InputMolecule_2_01[I1, I2, T1]
Macro creation of composite input molecule awaiting 2 inputs from user-defined DSL with 1 output group (arity 1).
Macro creation of composite input molecule awaiting 2 inputs from user-defined DSL with 1 output group (arity 1).

The builder pattern is used to add one or more attributes to an initial namespace like Person from the example below. Further non-related attributes can be tied together with the + method to form "composite molecules" that is basically just attributes sharing the same entity id.

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

Once the composite input molecule models the desired data structure and 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 composite input molecule
val personsAgeScore = m(Person.name.age_(?) + Tag.score_(?))

// At runtime, `age` and `score` values are applied to get the Person's name
personsAgeScore(42, 7).get.head === "Ben"
```
Composite input molecules of arity 1 has only one sub-molecule with output attribute(s). If the sub-molecule has multiple output attributes, a tuple is returned, otherwise just the single value:
```
Composite input molecule            Composite type (1 output group)

A.a1(?)       + B.b1_(?)      =>    a1
A.a1.a2(?)    + B.b1_(?)      =>    (a1, a2)
A.a1.a2.a3(?) + B.b1_(?)      =>    (a1, a2, a3)

A.a1_(?) + B.b1(?)            =>    b1
A.a1_(?) + B.b1.b2(?)         =>    (b1, b2)
A.a1_(?) + B.b1.b2.b3(?)      =>    (b1, b2, b3)

We could even have multiple tacit sub-molecules with multiple tacit attributes
A.a1_(?).a2_ + B.b1_(?) + C.c1.c2_.c3     =>    (c1, c3)
```
So, given 2 output attributes, a tuple is returned:
```
m(Person.name.age(?) + Tag.score_(?))(42, 7).get.head === ("Ben", 42)
//  A   . a1 . a2(?) +  B .   b1_(?)                   => (  a1 , a2)
```
I1
Type of input attribute 1 (age: Int)
I2
Type of input attribute 2 (score: Int)
T1
Type of output group
dsl
User-defined DSL structure modelling the composite input molecule awaiting 2 inputs
returns
Composite input molecule awaiting 2 inputs
Definition Classes
Composite_In_2_Factory2
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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.

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Composite_In_2_Factory2

Companion trait Composite_In_2_Factory2

object Composite_In_2_Factory2 extends Composite_In_2_Factory2

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composite2

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Composite_In_2_Factory2

Companion trait Composite_In_2_Factory2

object Composite_In_2_Factory2 extends Composite_In_2_Factory2

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Composite_In_2_Factory2