feat: #as_json

[caspiano]

It would be useful to have something like Ruby's #to_json included in ActiveModel::Serializers::JSON

Arguments

• only : Array(Symbol) : like Hash#select
• except : Array(Symbol) : like Hash#reject
• methods : Array(Symbol) : calls the methods on the model, merges them into serialized JSON

Usage

class Person < ActiveModel::Model
  attribute name : String

  def cool_name
    {"Bill", "Jill"}.includes?(@name)
  end
end

person = Person(name: "Jill")

# Calls methods and merges results as fields into serialized JSON
person.as_json(methods: [:cool_name]) # => "{\"name\":\"Jill\",\"cool_name\": true}"