RoR filter on controller as this SQL

Question

How to write filter on the controller in Ruby on Rails, that is eqvivalent to this SQL code

select * from persons where persons.category = 'developers'

Answer 1

Use this:

before_filter :nerds_only

private

def nerds_only
  @people = Person.where(:category => 'developers')
end

Answer 2

You may want to consider creating a named scope to get the nerdies:

class Person < ActiveRecord::Base
  scope :developers, where(category: 'developers')
end

In your controller:

before_filter :developers_only

private

def developers_only
  @people = Person.developers
end