作为可注释的线程示例

Question

我是 Rails 新手，目前正在开发博客。我想知道是否有关于如何将 Acts 用作可注释线程的教程，因为从 GitHub 中使用的唯一说明是将 acts_as_commentable 添加到您的模型中。

1. 我应该如何为新的 cmets 创建表单？
2. 如何从模型中检索所有 cmets？
3. 如何配置路由以显示 cmets？
4. 如何修改我的控制器以使此功能可用？

class Comment < ActiveRecord::Base
acts_as_nested_set :scope => [:commentable_id, :commentable_type]
#attr_accessible :commentable, :body, :user_id
validates :body, :presence => true
validates :user, :presence => true

# NOTE: install the acts_as_votable plugin if you
# want user to vote on the quality of comments.
#acts_as_votable

belongs_to :commentable, :polymorphic => true

# NOTE: Comments belong to a user
belongs_to :user

# Helper class method that allows you to build a comment
# by passing a commentable object, a user_id, and comment text
# example in readme
def self.build_from(obj, user_id, comment)
new \
  :commentable => obj,
  :body        => comment,
  :user_id     => user_id
end

#helper method to check if a comment has children
def has_children?
   self.children.any?
end

# Helper class method to lookup all comments assigned
# to all commentable types for a given user.
scope :find_comments_by_user, lambda { |user|
where(:user_id => user.id).order('created_at DESC')
}

# Helper class method to look up all comments for
# commentable class name and commentable id.
scope :find_comments_for_commentable, lambda { |commentable_str, commentable_id|
where(:commentable_type => commentable_str.to_s, :commentable_id =>   commentable_id).order('created_at DESC')
}

# Helper class method to look up a commentable object
# given the commentable class name and id
def self.find_commentable(commentable_str, commentable_id)
  commentable_str.constantize.find(commentable_id)
end
end

Answer 1

你有没有通过github中的以下链接，

https://github.com/jackdempsey/acts_as_commentable

通过调用这个命令，它会自动创建带有迁移的表单。

rails g 评论

您只需要运行迁移。

您使用的是哪个 Rails 版本？