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herenow/01_json_serializer.rb

Last active July 28, 2017 06:07
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Pass Virtus/Attribute classes to Rails' ActiveRecord serialize (as json)
Raw
01_json_serializer.rb
# lib/json_serializer.rb
class JsonSerializer
# Dumps objects to json.
# Loads json into specified class.
#
# e.g:
#
# class User
# serialize :data, JsonSerializer.new(DataObject)
# end
#
# Will serialize any instance of DataObject into a json string.
# Will unserialize any json string into an DataObject instance.
# Params:
# +klass+:: Class that parsed attributes will be initialized into
def initialize(klass)
@klass = klass
end
def dump(object)
object.as_json
end
def load(hash)
if hash.is_a? String
hash = JSON.parse(hash)
end
@klass.new(hash)
end
end
Raw
02_data_object.rb
# app/models/data_object.rb
class DataObject
include Virtus.model
attribute :moves, String
attribute :like, String
attribute :jagger, String
end
Raw
03_user.rb
# app/models/user.rb
require './lib/json_serializer'
class User
serialize :data, JsonSerializer.new(DataObject)
end
@herenow
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herenow commented Jul 27, 2017 •
edited
Loading

If you have a json/jsonb data column, you might expect the following to dump your DataObject instance as_json to the database.

serialize :data, DataObject

But this will actually serialize your DataObject through YAML, see.

--- !ruby/object:DataObject\n...

Not sure if this is something that Rails should check for: by default, if it's a json/jsonb column, when dumping call the method as_json, when loading initialize the json into the provided class, instead of using YAML.

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