Morph allows you to emerge Ruby class definitions from data or by calling assignment methods.
gem install morphTo use Morph:
require 'morph'Tested to work with Ruby 2.2 - 2.6.
Here's an example showing Morph creating classes and objects from JSON:
json = '{
"id": "3599110793",
"type": "PushEvent",
"actor": {
"id": 3447,
"login": "robmckinnon",
"url": "https://api.github.com/users/robmckinnon"
},
"repo": {
"id": 5092,
"name": "robmckinnon/morph",
"url": "https://api.github.com/repos/robmckinnon/morph"
}
}'
module Github; end
type = :push_event
namespace = Github
event = Morph.from_json json, type, namespace
# => <Github::PushEvent @id="3599110793", @type="PushEvent",
# @actor=#<Github::Actor:0x007faa0c86b790 @id=3447, @login="robmckinnon",
# @url="https://api.github.com/users/robmckinnon">,
# @repo=#<Github::Repo:0x007faa0c869198 @id=5092, @name="robmckinnon/morph",
# @url="https://api.github.com/repos/robmckinnon/morph">
# >
event.class # => Github::PushEvent
event.class.morph_attributes # => [:id, :type, :actor, :repo]
event.actor.class # => Github::Actor
event.repo.class # => Github::RepoIf namespace module not provided, new classes are created in Morph module.
event = Morph.from_json json, type, namespace
event.class # => Morph::PushEventHere's an example showing Morph playing with CSV (comma-separated values):
csv = %Q[name,party\nTed Roe,red\nAli Davidson,blue\nSue Smith,green]
people = Morph.from_csv(csv, 'person')
# => [#<Morph::Person @name="Ted Roe", @party="red">,
#<Morph::Person @name="Ali Davidson", @party="blue">,
#<Morph::Person @name="Sue Smith", @party="green">]
people.last.party # => "green"Here's example code showing Morph playing with TSV (tab-separated values):
tsv = %Q[name\tparty\nTed Roe\tred\nAli Davidson\tblue\nSue Smith\tgreen]
people = Morph.from_tsv(tsv, 'person')
# => [#<Morph::Person @name="Ted Roe", @party="red">,
#<Morph::Person @name="Ali Davidson", @party="blue">,
#<Morph::Person @name="Sue Smith", @party="green">]
people.last.party # => "green"Here's example code showing Morph playing with XML:
xml = %Q[<?xml version="1.0" encoding="UTF-8"?>
<councils type="array">
<council code='1'>
<name>Aberdeen City Council</name>
</council>
<council code='2'>
<name>Allerdale Borough Council</name>
</council>
</councils>]
councils = Morph.from_xml(xml)
# => [#<Morph::Council @code="1", @name="Aberdeen City Council">,
#<Morph::Council @code="2", @name="Allerdale Borough Council">]
councils.first.name # => "Aberdeen City Council"You can use register_listener to get callbacks when new methods on a class are
created.
For example given Morph used as a mixin:
class Project
include Morph
end
project = Project.newRegister listener:
listener = -> (klass, method) do
puts "class: #{klass.to_s} --- method: #{method}"
end
Morph.register_listener listenerCallback prints string as new methods are created via assignment calls:
project.deadline = "11 11 2075"
# class: Project --- method: deadline
project.completed = true
# class: Project --- method: completedTo unregister a listener use unregister_listener:
Morph.unregister_listener listenerFor an example of Morph's register_listener being used to
create a Github API
see the Hubbit module.
Time to generate an Active Record model? Get a sample script line like this:
Morph.script_generate(Project)
#=> "rails destroy model Project;
# rails generate model Project completed:string deadline:stringor specify the generator:
Morph.script_generate(Project, :generator => 'rspec_model')
#=> "rails destroy rspec_model Project;
# rails generate rspec_model Project completed:string deadline:stringYou'll have to edit this as it currently sets all data types to be string, and doesn't understand associations.
class Order
include Morph
end
order = Order.newHow about adding a hash of attribute values?
order.morph :drink => 'tea', :spoons_of_sugar => 2, :milk => 'prefer soya thanks'Looks like we got 'em:
order.drink # => "tea"
order.spoons_of_sugar # => 2
order.milk # => "prefer soya thanks"Create an item:
class Item
include Morph
end
item = Item.new
item.morph :name => 'spinach', :cost => 0.50Now an order:
class Order
include Morph
end
order = Order.new
order.no = 123
order.items = [item]Want to retrieve all that as a nested hash of values? No problem:
order.morph_attributes # => {:items=>[{:name=>"spinach", :cost=>0.5}], :no=>123}See LICENSE for the terms of this software.
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