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
24 lines
482 B
Ruby
24 lines
482 B
Ruby
class Reference < ActiveRecord::Base
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belongs_to :person
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belongs_to :job
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has_many :agents_posts_authors, :through => :person
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class << self
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attr_accessor :make_comments
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end
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before_destroy :make_comments
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def make_comments
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if self.class.make_comments
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person.update_attributes :comments => "Reference destroyed"
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end
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end
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end
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class BadReference < ActiveRecord::Base
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self.table_name = 'references'
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default_scope { where(:favourite => false) }
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end
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