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Contents
require 'dry/core/inflector'
module ROM
# Model builders can be used to build model classes for mappers
#
# This is used when you define a mapper and setup a model using :name option.
#
# @example
# # this will define User model for you
# class UserMapper < ROM::Mapper
# model name: 'User'
# attribute :id
# attribute :name
# end
#
# @private
class ModelBuilder
attr_reader :name
attr_reader :const_name, :namespace, :klass
# Return model builder subclass based on type
#
# @param [Symbol] type
#
# @return [Class]
#
# @api private
def self.[](type)
case type
when :poro then PORO
else
raise ArgumentError, "#{type.inspect} is not a supported model type"
end
end
# Build a model class
#
# @return [Class]
#
# @api private
def self.call(*args)
new(*args).call
end
# @api private
def initialize(options = {})
@name = options[:name]
if name
parts = name.split('::')
@const_name = parts.pop
@namespace =
if parts.any?
Dry::Core::Inflector.constantize(parts.join('::'))
else
Object
end
end
end
# Define a model class constant
#
# @api private
def define_const
namespace.const_set(const_name, klass)
end
# Build a model class supporting specific attributes
#
# @return [Class]
#
# @api private
def call(attrs)
define_class(attrs)
define_const if const_name
@klass
end
# PORO model class builder
#
# @private
class PORO < ModelBuilder
def define_class(attrs)
@klass = Class.new
@klass.send(:attr_reader, *attrs)
@klass.class_eval <<-RUBY, __FILE__, __LINE__ + 1
def initialize(params)
#{attrs.map { |name| "@#{name} = params[:#{name}]" }.join("\n")}
end
RUBY
self
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems