add observer generator

Author: chamnap

Gemfile

@@ -6,6 +6,8 @@ gem "rspec",            "~> 2.14.1"
 gem "pry",              "~> 0.9.12.6"
 gem "coveralls",        require: false
 gem "codeclimate-test-reporter"
+gem "ammeter",          "~> 1.0.0"
+gem "railties"
 
 # Specify your gem's dependencies in mongoid-observers.gemspec
 gemspec

lib/generators/mongoid/observer/observer_generator.rb

@@ -0,0 +1,21 @@
+# encoding: utf-8
+require "rails/generators"
+require "rails/generators/mongoid_generator"
+
+module Mongoid
+  module Generators
+    class ObserverGenerator < Base
+      check_class_collision suffix: "Observer"
+
+      def self.source_root
+        File.expand_path("../templates", __FILE__)
+      end
+
+      def create_observer_file
+        template "observer.rb.tt", File.join("app/models", class_path, "#{file_name}_observer.rb")
+      end
+
+      hook_for :test_framework
+    end
+  end
+end

lib/generators/mongoid/observer/templates/observer.rb.tt

@@ -0,0 +1,4 @@
+<% module_namespacing do -%>
+class <%= class_name %>Observer < Mongoid::Observer
+end
+<% end -%>

lib/mongoid/observers/railtie.rb

@@ -6,7 +6,7 @@ class Railtie < ::Rails::Railtie
       initializer "mongoid.observer" do |app|
         ActiveSupport.on_load(:mongoid) do
           if app.config.respond_to?(:mongoid)
-            Mongoid.observers = app.config.mongoid.observers
+            ::Mongoid.observers = app.config.mongoid.observers
           end
         end
       end

spec/generators/mongoid/observer/observer_generator_spec.rb

@@ -0,0 +1,25 @@
+require "spec_helper"
+
+# Generators are not automatically loaded by Rails
+require "generators/mongoid/observer/observer_generator"
+
+describe Mongoid::Generators::ObserverGenerator do
+  # Tell the generator where to put its output (what it thinks of as Rails.root)
+  destination File.expand_path("../../../../../spec/tmp", __FILE__)
+
+  before do
+    prepare_destination
+  end
+
+  it "observer without namespace" do
+    run_generator %w(product)
+    expect(file("app/models/product_observer.rb")).to exist
+    expect(file("app/models/product_observer.rb")).to contain(/class ProductObserver < Mongoid::Observer/)
+  end
+
+  it "observer with namespace" do
+    run_generator %w(admin/account)
+    expect(file("app/models/admin/account_observer.rb")).to exist
+    expect(file("app/models/admin/account_observer.rb")).to contain(/class Admin::AccountObserver < Mongoid::Observer/)
+  end
+end

spec/spec_helper.rb

@@ -16,7 +16,9 @@
 $LOAD_PATH.unshift(MODELS)
 
 require "pry"
+require "rails"
 require "mongoid-observers"
+require "ammeter/init"
 
 # mongoid connection
 Mongoid.load! File.dirname(__FILE__) + "/config/mongoid.yml", :test