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0a12a5f816
Don't use this:
scope :red, where(color: 'red')
default_scope where(color: 'red')
Use this:
scope :red, -> { where(color: 'red') }
default_scope { where(color: 'red') }
The former has numerous issues. It is a common newbie gotcha to do
the following:
scope :recent, where(published_at: Time.now - 2.weeks)
Or a more subtle variant:
scope :recent, -> { where(published_at: Time.now - 2.weeks) }
scope :recent_red, recent.where(color: 'red')
Eager scopes are also very complex to implement within Active
Record, and there are still bugs. For example, the following does
not do what you expect:
scope :remove_conditions, except(:where)
where(...).remove_conditions # => still has conditions
28 lines
822 B
Ruby
28 lines
822 B
Ruby
class Car < ActiveRecord::Base
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has_many :bulbs
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has_many :foo_bulbs, :class_name => "Bulb", :conditions => { :name => 'foo' }
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has_many :frickinawesome_bulbs, :class_name => "Bulb", :conditions => { :frickinawesome => true }
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has_one :bulb
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has_one :frickinawesome_bulb, :class_name => "Bulb", :conditions => { :frickinawesome => true }
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has_many :tyres
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has_many :engines, :dependent => :destroy
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has_many :wheels, :as => :wheelable, :dependent => :destroy
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scope :incl_tyres, -> { includes(:tyres) }
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scope :incl_engines, -> { includes(:engines) }
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scope :order_using_new_style, -> { order('name asc') }
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scope :order_using_old_style, -> { { :order => 'name asc' } }
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end
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class CoolCar < Car
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default_scope { order('name desc') }
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end
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class FastCar < Car
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default_scope { order('name desc') }
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end
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