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Contents
# frozen_string_literal: true
require "active_model"
module StoreModel
module Types
# Implements ActiveModel::Type::Value type for handling an array of
# StoreModel::Model
class ManyBase < ActiveModel::Type::Value
# Returns type
#
# @return [Symbol]
def type
raise NotImplementedError
end
# Casts +value+ from DB or user to StoreModel::Model instance
#
# @param value [Object] a value to cast
#
# @return StoreModel::Model
def cast_value(value)
case value
when String then decode_and_initialize(value)
when Array then ensure_model_class(value)
when nil then value
else
raise_cast_error(value)
end
end
# Casts a value from the ruby type to a type that the database knows how
# to understand.
#
# @param value [Object] value to serialize
#
# @return [String] serialized value
def serialize(value)
case value
when Array
ActiveSupport::JSON.encode(value)
else
super
end
end
# Determines whether the mutable value has been modified since it was read
#
# @param raw_old_value [Object] old value
# @param new_value [Object] new value
#
# @return [Boolean]
def changed_in_place?(raw_old_value, new_value)
cast_value(raw_old_value) != new_value
end
protected
def ensure_model_class(_array)
raise NotImplementedError
end
def cast_model_type_value(_value)
raise NotImplementedError
end
def raise_cast_error(_value)
raise NotImplementedError
end
private
# rubocop:disable Style/RescueModifier
def decode_and_initialize(array_value)
decoded = ActiveSupport::JSON.decode(array_value) rescue []
decoded.map { |attributes| cast_model_type_value(attributes) }
end
# rubocop:enable Style/RescueModifier
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems