Never do this

posts.rb

# The coding community is, and should be a welcoming and respectful place, and as such 
# I don't think it's fair to mock bad code when it's produced by a beginner or student,
# or when it's created for free for the public benefit, such as on an open source project.

# However, we also need to be accountable to our customers, clients and users, and when
# we produce terrible code in exchange for money, we should expect our peers to call us
# out on it.

# In that spirit, I don't feel guilty about sharing one of the most innovatively
# terrible pieces of Ruby code I have ever seen. It was written by a team of professional
# developers who were paid handsomely for their time. I will spare their shame by not
# mentioning the name of the company, and I have slightly anonymised the code below.

# Note the name of the class, the inconsistent snake/camel use, the bizarre naming of fields.
# But most of all, please note the absurdity that is `Posts#GetAllPosts(id)`, think about the
# bizarre set of circumstances that must have led to the developer deciding that they would
# have to roll their own implementation of Mongoid::Document#all...

class Posts
  include Mongoid::Document
  field :Pos_ID, type: String, default: ""
  field :Pos_NO, type: String, default: ""
  field :Tags, type: Array, default: []
  field :Pos_text, type: String, default: ""
  field :Pos_opt, type: Array, default: []
  field :opt_score, type: Array, default: []
  field :Words, type: Hash, default:{}
 # field :Pos_Img, type: String
  mount_uploader :attachment , PostsUploader
  mount_uploader :pos_attachment , PostsUploader

  def self.GetAllPosts(id)

    @mongo=mongo_client.list_databases
    puts @mongo
    @data= mongo_client.use("project_DB").database.collections
    @len=@data.count()
    if @len>0
      for @i in 0..@len-1
        if @data[@i].name=="posts"
          @collection=@data[@i]
        end
      end
    else
      puts "No collection Found"
    end

    @name=@collection


    # puts @name
    # @allrecored=@data[1].find().to_a
    # puts @allrecored
  end

end