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serializer.rb
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serializer.rb
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# frozen_string_literal: true
require_relative "serialization_descriptor"
require "oj"
class SerializationContext
attr_accessor :context, :scope
def initialize(context, scope)
@context = context
@scope = scope
end
def self.create(options)
if options.key?(:context) || options.key?(:scope)
SerializationContext.new(options[:context], options[:scope])
else
EmptySerializerContext.new
end
end
end
class EmptySerializerContext
def scope
nil
end
def context
nil
end
end
module Panko
class Serializer
SKIP = Object.new.freeze
class << self
def inherited(base)
if _descriptor.nil?
base._descriptor = Panko::SerializationDescriptor.new
base._descriptor.attributes = []
base._descriptor.aliases = {}
base._descriptor.method_fields = []
base._descriptor.has_many_associations = []
base._descriptor.has_one_associations = []
else
base._descriptor = Panko::SerializationDescriptor.duplicate(_descriptor)
end
base._descriptor.type = base
end
attr_accessor :_descriptor
def attributes(*attrs)
@_descriptor.attributes.push(*attrs.map { |attr| Attribute.create(attr) }).uniq!
end
def aliases(aliases = {})
aliases.each do |attr, alias_name|
@_descriptor.attributes << Attribute.create(attr, alias_name: alias_name)
end
end
def method_added(method)
super(method)
return if @_descriptor.nil?
deleted_attr = @_descriptor.attributes.delete(method)
@_descriptor.method_fields << Attribute.create(method) unless deleted_attr.nil?
end
def has_one(name, options = {})
serializer_const = options[:serializer]
if serializer_const.kind_of?(String)
serializer_const = Panko::SerializerResolver.resolve(serializer_const, self)
end
serializer_const ||= Panko::SerializerResolver.resolve(name.to_s, self)
raise "Can't find serializer for #{self.name}.#{name} has_one relationship." if serializer_const.nil?
@_descriptor.has_one_associations << Panko::Association.new(
name,
options.fetch(:name, name).to_s,
Panko::SerializationDescriptor.build(serializer_const, options)
)
end
def has_many(name, options = {})
serializer_const = options[:serializer] || options[:each_serializer]
if serializer_const.kind_of?(String)
serializer_const = Panko::SerializerResolver.resolve(serializer_const, self)
end
serializer_const ||= Panko::SerializerResolver.resolve(name.to_s, self)
raise "Can't find serializer for #{self.name}.#{name} has_many relationship." if serializer_const.nil?
@_descriptor.has_many_associations << Panko::Association.new(
name,
options.fetch(:name, name).to_s,
Panko::SerializationDescriptor.build(serializer_const, options)
)
end
end
def initialize(options = {})
# this "_skip_init" trick is so I can create serializers from serialization descriptor
return if options[:_skip_init]
@serialization_context = SerializationContext.create(options)
@descriptor = Panko::SerializationDescriptor.build(self.class, options, @serialization_context)
@used = false
end
def context
@serialization_context.context
end
def scope
@serialization_context.scope
end
attr_writer :serialization_context
attr_reader :object
def serialize(object)
serialize_with_writer(object, Panko::ObjectWriter.new).output
end
def serialize_to_json(object)
serialize_with_writer(object, Oj::StringWriter.new(mode: :rails)).to_s
end
private
def serialize_with_writer(object, writer)
raise ArgumentError.new("Panko::Serializer instances are single-use") if @used
Panko.serialize_object(object, writer, @descriptor)
@used = true
writer
end
end
end