Index

chap1

1. attr_*

2. virtual attribute/ setter / :method=

3. use var & @var in class

4. &:symbol

5. define_method(*args)

6. constantize(str)

7. Inject and Reduce

8. File

9. const_get / send (fetch class/method by "string" or :sym)

10. include / extend

chap2

1. struct & hash

2. save & save!

3. bang !pa

4. new & build

5. nil? & empty? & blank?

6. update & update_all & update_attribute & update_attribute

7. scope

chap3

1. Number

2. Float vs BigDecimal (precision)

3. Fixnum vs Bignum

chap4

1. Rails: ActiveModel, ActiveRecord and ActiveResource

2. Rails: Action Pack

Enterprise Rails

Nokogiri

ActiveRecord - 進階功能

1. 單一表格繼承STI(Single-table inheritance)

2. 交易Transactions

3. 序列化Serialize

4. Store

pack & unpack

Performance related

Engines & plugins

JSONb, JSON & hStore