# Creating new HaBtM?

**URL:** <https://www.ruby-forum.com/t/creating-new-habtm/121893>\
**Category:** Rails\
**Created:** [December 2, 2007, 2:03pm UTC](https://www.ruby-forum.com/t/creating-new-habtm/121893 "2007-12-02T14:03:48Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![yachtman](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/d07c76/32.png) [@yachtman](https://www.ruby-forum.com/u/yachtman)\
**Post date:** [December 2, 2007, 2:03pm UTC](https://www.ruby-forum.com/t/creating-new-habtm/121893/1 "2007-12-02T14:03:48Z")

</div>

Ok, I must be lame. Can’t figure out how to create a new entry in my  
HABTM models. I just want to add a new book with two authors… How do  
I do it?

class Author \< ActiveRecord::Base  
has\_and\_belongs\_to\_many :books  
end

class Books \< ActiveRecord::Base  
has\_and\_belongs\_to\_many :authors  
end

---

<div class="post-metadata">

**Author:** ![yachtman](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/d07c76/32.png) [@yachtman](https://www.ruby-forum.com/u/yachtman)\
**Post date:** [December 2, 2007, 4:00pm UTC](https://www.ruby-forum.com/t/creating-new-habtm/121893/2 "2007-12-02T16:00:55Z")

</div>

On 2 Dec 2007, at 13:03, yachtman wrote:

> has\_and\_belongs\_to\_many :authors  
> end

Your Books model should be called Book.  
Once that’s ok it’s as easy as book.authors = [author\_1, author\_2]

Fred