Active Record Migrations

Question 1

Whats the easiest way to add a migration for a new model?

Answer 1

rails g model Name name:string description:text

Question 2

How do you create a standalone migration?

Answer 2

rails g migration AddPartNumberToProduct part_number:string

This will create a migration file with the following line:

add_column :products, :part_number, :string

Question 3

How do you create a migration to add a part number t o a product, with an index?

Answer 3

rails g migration AddPartNumberToProduct part_number:string:index

Question 4

How do you generate a migration to remove a column from a database table?

Answer 4

rails g migration RemovePartNumberFromProducts part_number:string

Question 5

How can you add multiple columns to a database table?

Answer 5

rails g migration AddDetailsToProduct description:text price:decimal

Question 6

How can you generate a migration file for a new table?

Answer 6

rails g migration CreateProducts name:string price:decimal

Question 7

How do you add a user reference column to a database website table?

Answer 7

rails g migration AddUserRefToWebsite user:references

Question 8

How do you generate a migration to create a join table for two models?

Answer 8

rails g migrations CreateJoinTableUserWebsite user website