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rails--rails/activerecord/test/models/categorization.rb
Jon Leighton 0a12a5f816 Deprecate eager-evaluated scopes.
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
2012-03-21 22:18:18 +00:00

19 lines
732 B
Ruby

class Categorization < ActiveRecord::Base
belongs_to :post
belongs_to :category
belongs_to :named_category, :class_name => 'Category', :foreign_key => :named_category_name, :primary_key => :name
belongs_to :author
has_many :post_taggings, :through => :author, :source => :taggings
belongs_to :author_using_custom_pk, :class_name => 'Author', :foreign_key => :author_id, :primary_key => :author_address_extra_id
has_many :authors_using_custom_pk, :class_name => 'Author', :foreign_key => :id, :primary_key => :category_id
end
class SpecialCategorization < ActiveRecord::Base
self.table_name = 'categorizations'
default_scope { where(:special => true) }
belongs_to :author
belongs_to :category
end