```ruby
class Project
  include Mongoid::Document

  field :name, :type => String
  field :desciption, :type => String

  has_many :documents
  has_and_belongs_to_many :users
end
```

Fix typo in field :description of Project
user
```ruby
class Project
  include Mongoid::Document

  field :name, :type => String
  field :description, :type => String

  has_many :documents
  has_and_belongs_to_many :users
end
```
assistant