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