Ruby on Rails/ActiveRecord

ActiveRecord - The Model

• Naming

See the way the models are named and what names to avoid

• Migrations

How to get your data inside the database in a convenient way

• Associations

Connect different models together

• Callbacks

Read about how to manipulate your data at certain states of their existence

• Validations

Check your input for their correctness

• Attributes

How to look up different criteria without writing SQL

• Aggregations

Write advanced aggregations inside your model

• Calculations

Do basic mathematical calculations with your data

• acts_as

Extend functionality with acts_as

• Timestamps
• Connection adapters