Add moderate method and ModerationModel class

lib/the_moderator.rb

@@ -1,5 +1,6 @@
-require "the_moderator/version"
+require 'the_moderator/version'
+require 'the_moderator/exceptions'
+require 'the_moderator/model'
+require 'the_moderator/moderation_model'
 
-module TheModerator
-  # Your code goes here...
-end
+require 'the_moderator/railtie' if defined?(Rails)

lib/the_moderator/exceptions.rb

@@ -0,0 +1,4 @@
+module TheModerator
+  class ModerationNotAccepted < StandardError
+  end
+end

lib/the_moderator/model.rb

@@ -0,0 +1,49 @@
+module TheModerator
+  module Model
+    def self.included(base)
+      base.has_many :moderations, as: :moderatable, dependent: :destroy
+    end
+
+    def moderate(*moderated_attributes)
+      data = moderation_data(*moderated_attributes)
+      moderations.build(data: {attributes: data}) unless data.empty?
+    end
+
+    protected
+
+    def moderation_data(*moderated_attributes)
+      moderate_object moderated_attributes
+    end
+
+    private
+
+    def moderate_object(moderated_attributes)
+      object_fields = {}
+      moderated_attributes.each do |attribute|
+        if attribute.is_a?(Hash)
+          attribute.each do |key, value|
+            data = moderate_association(key, value)
+            object_fields[:"#{key}_attributes"] = data unless data.empty?
+          end
+        elsif changed.include?(attribute.to_s)
+          object_fields[attribute.to_sym] = send(attribute)
+          send("#{attribute}=", changed_attributes[attribute.to_s])
+        end
+      end
+
+      object_fields
+    end
+
+    def moderate_association(assoc, moderated_attributes)
+      assoc_fields = {}
+      send(assoc).each do |resource|
+        if respond_to?("#{assoc}_attributes=")
+          data = resource.moderation_data(*moderated_attributes)
+          assoc_fields[resource.id] = data.merge(id: resource.id) unless data.empty?
+        end
+      end
+
+      assoc_fields
+    end
+  end
+end

lib/the_moderator/moderation_model.rb

@@ -0,0 +1,36 @@
+module TheModerator
+  module ModerationModel
+    def self.included(base)
+      base.send :extend, ClassMethods
+
+      base.class_eval do
+        belongs_to :moderatable, polymorphic: true
+        serialize :data
+      end
+    end
+
+    module ClassMethods
+    end
+
+    def accept
+      self.class.transaction do
+        destroy
+        moderatable.update_attributes(data)
+      end
+    end
+
+    def accept!
+      accept || raise(TheModerator::ModerationNotAccepted)
+    end
+
+    def discard
+      destroy
+    end
+
+    def preview
+      preview = moderatable.clone
+      preview.attributes = data
+      preview.freeze
+    end
+  end
+end

lib/the_moderator/railtie.rb

@@ -0,0 +1,9 @@
+module TheModerator
+  class Railtie < Rails::Railtie
+    initializer "the_moderator.include_in_active_record" do
+      ActiveSupport.on_load :active_record do
+        include TheModerator::Model
+      end
+    end
+  end
+end

the_moderator.gemspec

@@ -18,6 +18,9 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "activemodel", ">= 3.2.0"
+  spec.add_dependency "activerecord", ">= 3.2.0"
+
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"
 end