Composite_Factory2

Companion trait Composite_Factory2

object Composite_Factory2 extends Composite_Factory2

Source: Composite_Factory.scala

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implicit final macro def m[T1, T2](dsl: Composite02[T1, T2]): Molecule02[T1, T2]
Macro creation of composite molecule from user-defined DSL structure with 2 output groups.
Macro creation of composite molecule from user-defined DSL structure with 2 output groups.

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.

Once the composite molecule models the desired data structure we can call various actions on it, like get that retrieves matching data from the database.
```
// Explicitly calling `m` to create composite molecule with 2 output attributes
m(Person.name + Tag.score).get.head === ("Ben", 7)

// Alternatively we can create the composite molecule implicitly
Person.name.+(Tag.score).get.head === ("Ben", 7)
```
Composite 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 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.flags).get.head                         === ("Ben", (7, 3))
m(Person.name.age + Tag.score).get.head                           === (("Ben", 42), 7)
m(Person.name.age + Tag.score.flags).get.head                     === (("Ben", 42), (7, 3))

m(Person.name.age +
  Tag.score.flags +
  Cat.name_("pitcher")).get.head === (("Ben", 42), (7, 3))
```
T1
Type of output group 1
T2
Type of output group 2
dsl
User-defined DSL structure modelling the composite molecule
returns
Composite molecule
Definition Classes
Composite_Factory2
implicit final macro def m[T1](dsl: Composite01[T1]): Molecule01[T1]
Macro creation of composite molecule from user-defined DSL structure with 1 output group.
Macro creation of composite molecule from user-defined DSL structure with 1 output group.

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.

Once the composite molecule models the desired data structure we can call various actions on it, like get that retrieves matching data from the database.
```
// Explicitly calling `m` to create composite molecule
// with 1 output attribute (`name`) and 1 tacit attribute (`score`).
m(Person.name + Tag.score_).get.head === "Ben"

// Alternatively we can create the composite molecule implicitly
Person.name.+(Tag.score_).get.head === "Ben"
```
Composite 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 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) etc...

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

We could even have multiple tacit sub-molecules with multiple tacit attributes
A.a1_.a2_ + B.b1_ + C.c1.c2_.c3     =>    (c1, c3) etc...
```
So, given two output attributes, a tuple is returned:
```
m(Person.name.age + Tag.score_).get.head === ("Ben", 42)
//  A   . a1 . a2 +  B .  b1              => (  a1 , a2)
```
T1
Type of output group 1
dsl
User-defined DSL structure modelling the composite molecule
returns
Composite molecule
Definition Classes
Composite_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_Factory2

Companion trait Composite_Factory2

object Composite_Factory2 extends Composite_Factory2

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Composite_Factory2

Companion trait Composite_Factory2

object Composite_Factory2 extends Composite_Factory2

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Composite_Factory2