module JSON::ArrayConverter(Converter)

Overview

Converter to be used with JSON::Serializable to serialize the elements of an Array(T) with the custom converter.

require "json"

class TimestampArray
  include JSON::Serializable

  @[JSON::Field(converter: JSON::ArrayConverter(Time::EpochConverter))]
  property dates : Array(Time)
end

timestamp = TimestampArray.from_json(%({"dates":[1459859781,1567628762]}))
timestamp.dates   # => [2016-04-05 12:36:21 UTC, 2019-09-04 20:26:02 UTC]
timestamp.to_json # => %({"dates":[1459859781,1567628762]})

JSON::ArrayConverter.new should be used if the nested converter is also an instance instead of a type.

require "json"

class TimestampArray
  include JSON::Serializable

  @[JSON::Field(converter: JSON::ArrayConverter.new(Time::Format.new("%b %-d, %Y")))]
  property dates : Array(Time)
end

timestamp = TimestampArray.from_json(%({"dates":["Apr 5, 2016","Sep 4, 2019"]}))
timestamp.dates   # => [2016-04-05 00:00:00 UTC, 2019-09-04 00:00:00 UTC]
timestamp.to_json # => %({"dates":["Apr 5, 2016","Sep 4, 2019"]})

This implies that JSON::ArrayConverter(T) and JSON::ArrayConverter(T.class).new(T) perform the same serializations.

Defined in:

json/from_json.cr
json/to_json.cr

Constructors

• .new(converter : Converter)

Class Method Summary

• .from_json(pull : JSON::PullParser)
• .to_json(values : Array, builder : JSON::Builder)

Constructor Detail

Class Method Detail