Concept Modeling

I came across this article link below when I'm reviewing my Project ERD design, I supposed to read about Entity Relational Database and the difference between each entities but I ended up stuck on reading more on "ABC" as an Entrepreneur that work as an an Investor as well. Read more about it below.

Read here why we need Concept Modeling in our ABC.

Demo for Banner Display

NIVO Slider

http://nivo.dev7studios.com/demos/

Change a column data type with Rails migration

I always forget the syntax for this and I have to look it up, so I am going to post it here. Maybe this will help some others out. Basically, what I need to do is change the data type of a column in my database table. The table “address” contains a column/field named “postal_code” which was integer type. I want to change postal_code from an integer to a string. So first I create a rails migration with the following command.

class AlterPostalCodeToString < ActiveRecord::Migration

def self.up

change_table :addresses do |address|

address.change :postal_code, :string

end

change_table :company_addresses do |address|

address.change :postal_code, :string

end

end

def self.down

change_table :addresses do |address|

address.change :postal_code, :integer

end

change_table :company_addresses do |address|

address.change :postal_code, :integer

end

end

end