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Contents
module ActiveGraph
module Shared
# This module provides a convenient way of registering a custom Typecasting class. Custom Typecasters all follow a simple pattern.
#
# EXAMPLE:
#
# .. code-block:: ruby
#
# class RangeConverter
# class << self
# def primitive_type
# String
# end
#
# def convert_type
# Range
# end
#
# def to_db(value)
# value.to_s
# end
#
# def to_ruby(value)
# ends = value.to_s.split('..').map { |d| Integer(d) }
# ends[0]..ends[1]
# end
# alias_method :call, :to_ruby
# end
#
# include ActiveGraph::Shared::Typecaster
# end
#
# This would allow you to use `property :my_prop, type: Range` in a model.
# Each method and the `alias_method` call is required. Make sure the module inclusion happens at the end of the file.
#
# `primitive_type` is used to fool ActiveAttr's type converters, which only recognize a few basic Ruby classes.
#
# `convert_type` must match the constant given to the `type` option.
#
# `to_db` provides logic required to transform your value into the class defined by `primitive_type`
#
# `to_ruby` provides logic to transform the DB-provided value back into the class expected by code using the property.
# In other words, it should match the `convert_type`.
#
# Note that `alias_method` is used to make `to_ruby` respond to `call`. This is to provide compatibility with ActiveAttr.
module Typecaster
def self.included(other)
ActiveGraph::Shared::TypeConverters.register_converter(other)
end
end
end
end
Version data entries
42 entries across 42 versions & 1 rubygems