# What is "line\_items"?

**URL:** <https://www.ruby-forum.com/t/what-is-line-items/193342>\
**Category:** Rails\
**Created:** [August 16, 2010, 8:21am UTC](https://www.ruby-forum.com/t/what-is-line-items/193342 "2010-08-16T08:21:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ct9a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ad7895/32.png) [@ct9a](https://www.ruby-forum.com/u/ct9a)\
**Post date:** [August 16, 2010, 8:21am UTC](https://www.ruby-forum.com/t/what-is-line-items/193342/1 "2010-08-16T08:21:16Z")

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hi guys,  
I am looking at [#141 PayPal Basics - RailsCasts](http://railscasts.com/episodes/141-paypal-basics) and  
I am trying to figure out what’s line\_items?

Is it a reserved keyword representing a row of a multi row form or is  
it just a variable that’s called line\_items (and is not a reserved  
keyword)?

If it is a reserved keyword/function in rails, can someone please  
point me to some documentation?

thanks

Gordon

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<div class="post-metadata">

**Author:** ![ct9a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ad7895/32.png) [@ct9a](https://www.ruby-forum.com/u/ct9a)\
**Post date:** [August 16, 2010, 12:45pm UTC](https://www.ruby-forum.com/t/what-is-line-items/193342/2 "2010-08-16T12:45:15Z")

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ah right. So it is a user defined model. Am I right?

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<div class="post-metadata">

**Author:** ![ct9a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ad7895/32.png) [@ct9a](https://www.ruby-forum.com/u/ct9a)\
**Post date:** [August 16, 2010, 12:37pm UTC](https://www.ruby-forum.com/t/what-is-line-items/193342/3 "2010-08-16T12:37:38Z")

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line\_items is a model/table.

class LineItem \< ActiveRecord::Base  
belongs\_to :cart  
belongs\_to :product

def full\_price  
unit\_price \* quantity  
end  
end

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<div class="post-metadata">

**Author:** ![ct9a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ad7895/32.png) [@ct9a](https://www.ruby-forum.com/u/ct9a)\
**Post date:** [August 16, 2010, 4:21pm UTC](https://www.ruby-forum.com/t/what-is-line-items/193342/4 "2010-08-16T16:21:52Z")

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Yes, it’s a user defined model.

-Conrad