Category/subcategory CRUD

Hello there! This is my first post! :wink:
I’m starting on ruby on rails, so I have many doubts about it!

I’m trying to create a system that uses categories/subcategories.
I created a scaffold for a table that has the following fields:

  • id int(11)
  • name varchar(50)
  • keyname varchar(50)
  • visible enum(β€˜0’,β€˜1’) default β€˜0’
  • pid int(11)

The rows are added as:
1, Articles, articles, 1, 0
2, Ruby on Rails, rubyonrails, 1, 1
3, PHP, php, 1, 1
4, FAQ, faq, 1, 0
5, Question 1, q1, 1, 4
6, Question 2, q2, 1, 4

And so on…

The PID field denotes the parent category. So, I have a structure like:

– Ruby on Rails
– Question 1
– Question 2

My question is: I created a scaffold for CRUD the categories. How to add
a SELECT tag populated with all categories that doesn’t has the parent
id (pid)?

I want something like:


Name: _________
Keyname: _________
[x] Turn this category visible
Parent category: [------------------] <= combobox
[No parent category]


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