在 Rails 4 中,您可以将选项传递给关注点。所以如果你这样做:
# routes.rb
concern :commentable do |options|
resources :comments, options
end
resources :articles do
concerns :commentable, commentable_type: 'Article'
end
然后当你rake routes
,你会看到你得到一个像
POST /articles/:id/comments, {commentable_type: 'Article'}
这将覆盖请求尝试设置的任何内容以确保其安全。然后在您的 CommentsController 中:
# comments_controller.rb
class CommentsController < ApplicationController
before_filter :set_commentable, only: [:index, :create]
def create
@comment = Comment.create!(commentable: @commentable)
respond_with @comment
end
private
def set_commentable
commentable_id = params["#{params[:commentable_type].underscore}_id"]
@commentable = params[:commentable_type].constantize.find(commentable_id)
end
end
使用 rspec 测试此类控制器的一种方法是:
require 'rails_helper'
describe CommentsController do
let(:article) { create(:article) }
[:article].each do |commentable|
it "creates comments for #{commentable.to_s.pluralize} " do
obj = send(commentable)
options = {}
options["#{commentable.to_s}_id"] = obj.id
options["commentable_type".to_sym] = commentable.to_s.camelize
options[:comment] = attributes_for(:comment)
post :create, options
expect(obj.comments).to eq [Comment.all.last]
end
end
end