พื้นฐานในการสร้างปลั๊กอิน Rails

$ rails plugin new yaffle

$ rails plugin new --help

spec.homepage    = "http://example.com"
spec.summary     = "Summary of Yaffle."
spec.description = "Description of Yaffle."

...

spec.metadata["source_code_uri"] = "http://example.com"
spec.metadata["changelog_uri"] = "http://example.com"

$ bin/test
...
1 runs, 1 assertions, 0 failures, 0 errors, 0 skips

# yaffle/test/core_ext_test.rb

require "test_helper"

class CoreExtTest < ActiveSupport::TestCase
  def test_to_squawk_prepends_the_word_squawk
    assert_equal "squawk! Hello World", "Hello World".to_squawk
  end
end

$ bin/test
E

Error:
CoreExtTest#test_to_squawk_prepends_the_word_squawk:
NoMethodError: undefined method `to_squawk' for "Hello World":String


bin/test /path/to/yaffle/test/core_ext_test.rb:4

.

Finished in 0.003358s, 595.6483 runs/s, 297.8242 assertions/s.
2 runs, 1 assertions, 0 failures, 1 errors, 0 skips

# yaffle/lib/yaffle.rb

require "yaffle/version"
require "yaffle/railtie"
require "yaffle/core_ext"

module Yaffle
  # Your code goes here...
end

# yaffle/lib/yaffle/core_ext.rb

class String
  def to_squawk
    "squawk! #{self}".strip
  end
end

$ bin/test
...
2 runs, 2 assertions, 0 failures, 0 errors, 0 skips

irb> "Hello World".to_squawk
=> "squawk! Hello World"

# yaffle/test/acts_as_yaffle_test.rb

require "test_helper"

class ActsAsYaffleTest < ActiveSupport::TestCase
end

# yaffle/lib/yaffle.rb

require "yaffle/version"
require "yaffle/railtie"
require "yaffle/core_ext"
require "yaffle/acts_as_yaffle"

module Yaffle
  # Your code goes here...
end

# yaffle/lib/yaffle/acts_as_yaffle.rb

module Yaffle
  module ActsAsYaffle
  end
end

# yaffle/test/acts_as_yaffle_test.rb

require "test_helper"

class ActsAsYaffleTest < ActiveSupport::TestCase
  def test_a_hickwalls_yaffle_text_field_should_be_last_squawk
    assert_equal "last_squawk", Hickwall.yaffle_text_field
  end

  def test_a_wickwalls_yaffle_text_field_should_be_last_tweet
    assert_equal "last_tweet", Wickwall.yaffle_text_field
  end
end

$ bin/test
# Running:

..E

Error:
ActsAsYaffleTest#test_a_wickwalls_yaffle_text_field_should_be_last_tweet:
NameError: uninitialized constant ActsAsYaffleTest::Wickwall


bin/test /path/to/yaffle/test/acts_as_yaffle_test.rb:8

E

Error:
ActsAsYaffleTest#test_a_hickwalls_yaffle_text_field_should_be_last_squawk:
NameError: uninitialized constant ActsAsYaffleTest::Hickwall


bin/test /path/to/yaffle/test/acts_as_yaffle_test.rb:4



Finished in 0.004812s, 831.2949 runs/s, 415.6475 assertions/s.
4 runs, 2 assertions, 0 failures, 2 errors, 0 skips

$ cd test/dummy
$ bin/rails generate model Hickwall last_squawk:string
$ bin/rails generate model Wickwall last_squawk:string last_tweet:string

$ cd test/dummy
$ bin/rails db:migrate

# test/dummy/app/models/hickwall.rb

class Hickwall < ApplicationRecord
  acts_as_yaffle
end

# test/dummy/app/models/wickwall.rb

class Wickwall < ApplicationRecord
  acts_as_yaffle yaffle_text_field: :last_tweet
end

# yaffle/lib/yaffle/acts_as_yaffle.rb

module Yaffle
  module ActsAsYaffle
    extend ActiveSupport::Concern

    class_methods do
      def acts_as_yaffle(options = {})
      end
    end
  end
end

# test/dummy/app/models/application_record.rb

class ApplicationRecord < ActiveRecord::Base
  include Yaffle::ActsAsYaffle

  self.abstract_class = true
end

$ bin/test
# Running:

.E

Error:
ActsAsYaffleTest#test_a_hickwalls_yaffle_text_field_should_be_last_squawk:
NoMethodError: undefined method `yaffle_text_field' for #<Class:0x0055974ebbe9d8>


bin/test /path/to/yaffle/test/acts_as_yaffle_test.rb:4

E

Error:
ActsAsYaffleTest#test_a_wickwalls_yaffle_text_field_should_be_last_tweet:
NoMethodError: undefined method `yaffle_text_field' for #<Class:0x0055974eb8cfc8>


bin/test /path/to/yaffle/test/acts_as_yaffle_test.rb:8

.

Finished in 0.008263s, 484.0999 runs/s, 242.0500 assertions/s.
4 runs, 2 assertions, 0 failures, 2 errors, 0 skips

# yaffle/lib/yaffle/acts_as_yaffle.rb

module Yaffle
  module ActsAsYaffle
    extend ActiveSupport::Concern

    class_methods do
      def acts_as_yaffle(options = {})
        cattr_accessor :yaffle_text_field, default: (options[:yaffle_text_field] || :last_squawk).to_s
      end
    end
  end
end

# test/dummy/app/models/application_record.rb

class ApplicationRecord < ActiveRecord::Base
  include Yaffle::ActsAsYaffle

  self.abstract_class = true
end

$ bin/test
...
4 runs, 4 assertions, 0 failures, 0 errors, 0 skips

# yaffle/test/acts_as_yaffle_test.rb
require "test_helper"

class ActsAsYaffleTest < ActiveSupport::TestCase
  def test_a_hickwalls_yaffle_text_field_should_be_last_squawk
    assert_equal "last_squawk", Hickwall.yaffle_text_field
  end

  def test_a_wickwalls_yaffle_text_field_should_be_last_tweet
    assert_equal "last_tweet", Wickwall.yaffle_text_field
  end

  def test_hickwalls_squawk_should_populate_last_squawk
    hickwall = Hickwall.new
    hickwall.squawk("Hello World")
    assert_equal "squawk! Hello World", hickwall.last_squawk
  end

  def test_wickwalls_squawk_should_populate_last_tweet
    wickwall = Wickwall.new
    wickwall.squawk("Hello World")
    assert_equal "squawk! Hello World", wickwall.last_tweet
  end
end

# yaffle/lib/yaffle/acts_as_yaffle.rb

module Yaffle
  module ActsAsYaffle
    extend ActiveSupport::Concern

    included do
      def squawk(string)
        write_attribute(self.class.yaffle_text_field, string.to_squawk)
      end
    end

    class_methods do
      def acts_as_yaffle(options = {})
        cattr_accessor :yaffle_text_field, default: (options[:yaffle_text_field] || :last_squawk).to_s
      end
    end
  end
end

# test/dummy/app/models/application_record.rb

class ApplicationRecord < ActiveRecord::Base
  include Yaffle::ActsAsYaffle

  self.abstract_class = true
end

$ bin/test
...
6 runs, 6 assertions, 0 failures, 0 errors, 0 skips

send("#{self.class.yaffle_text_field}=", string.to_squawk)

gem "yaffle", git: "https://github.com/rails/yaffle.git"

$ bundle exec rake -T

$ bundle exec rake build
# สร้าง yaffle-0.1.0.gem ในไดเรกทอรี pkg

$ bundle exec rake install
# สร้างและติดตั้ง yaffle-0.1.0.gem เข้าสู่ระบบ gem

$ bundle exec rake release
# สร้างแท็ก v0.1.0 และสร้างและเผยแพร่ yaffle-0.1.0.gem ไปยัง Rubygems

$ bundle exec rake rdoc