Projection

You can project multiple objects and maps into a single object by using the Projection class and its methods.

Data Transfer Objects (DTO)

When working with DTOs, you can use this method to create a new object from the data of the original object while also allowing you to merge in additional data from other serializable objects or maps.

Projection Expansion

var user = Projection<User>()
    .merge(NameAndAge("Alex", 22))
    .mergeMap({"id": "1234", "isAdmin": true})
    .perform();

Projection Reduction

var reduced = Projection<NameAndAge>()
    .merge(User("1234", "Alex", 22, true))
    .perform();

Projection operations are executed top-down in the order they were added.

Reusable Projection Pipelines

Projection objects can be easily reused by using unwrap methods instead of merge methods. These methods will unwrap/'merge' value loaded from a specific path. The pipelines can then be invoked by specifying input values in the perform method.

Reusable Projection Pipeline

final projection = Projection<NameAndAge>()
  .unwrapType<User>("input");

// Usage
final invoked = projection.perform({
  "input": User("1234", "Alex", 22, true)
});