RailsMissed Layers

Model

Controller

View

FORM OBJECT

FORM OBJECT IS A DESIGN PATTERN THAT

ENCAPSULATES LOGIC RELATED TO VALIDATING AND

PERSISTING DATA.

SERVICE OBJECT

Service Objects are created when an action:

is complex (such as calculating an employee’s salary)uses APIs of external services

clearly doesn’t belong to one model (for example, deleting outdated data)

uses several models (for example, importing data from one file to several models)

INTERACTOR OBJECT

VALUE OBJECT

QUERY OBJECT

Query Object is a design pattern that lets us extract query logic from Controllers and Models into reusable

classes.

POLICY OBJECT

Policy Objects encapsulate complex business rules and can easily be replaced by other Policy Objects with

different rules.

WHAT’S NEXT ?

NAMING

QUESTION ?