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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
127 lines
3.3 KiB
Ruby
127 lines
3.3 KiB
Ruby
class Topic < ActiveRecord::Base
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scope :base, -> { scoped }
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scope :written_before, lambda { |time|
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if time
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{ :conditions => ['written_on < ?', time] }
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end
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}
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scope :approved, -> { where(:approved => true) }
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scope :rejected, -> { where(:approved => false) }
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scope :scope_with_lambda, lambda { scoped }
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scope :by_lifo, -> { where(:author_name => 'lifo') }
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ActiveSupport::Deprecation.silence do
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scope :approved_as_hash_condition, :conditions => {:topics => {:approved => true}}
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scope :replied, :conditions => ['replies_count > 0']
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end
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scope 'approved_as_string', -> { where(:approved => true) }
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scope :anonymous_extension, -> { scoped } do
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def one
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1
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end
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end
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scope :with_object, Class.new(Struct.new(:klass)) {
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def call
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klass.where(:approved => true)
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end
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}.new(self)
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module NamedExtension
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def two
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2
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end
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end
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module MultipleExtensionOne
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def extension_one
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1
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end
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end
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module MultipleExtensionTwo
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def extension_two
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2
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end
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end
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scope :named_extension, -> { { :extend => NamedExtension } }
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scope :multiple_extensions, -> { { :extend => [MultipleExtensionTwo, MultipleExtensionOne] } }
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has_many :replies, :dependent => :destroy, :foreign_key => "parent_id"
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has_many :replies_with_primary_key, :class_name => "Reply", :dependent => :destroy, :primary_key => "title", :foreign_key => "parent_title"
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has_many :unique_replies, :dependent => :destroy, :foreign_key => "parent_id"
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has_many :silly_unique_replies, :dependent => :destroy, :foreign_key => "parent_id"
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serialize :content
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before_create :default_written_on
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before_destroy :destroy_children
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# Explicitly define as :date column so that returned Oracle DATE values would be typecasted to Date and not Time.
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# Some tests depend on assumption that this attribute will have Date values.
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if current_adapter?(:OracleEnhancedAdapter)
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set_date_columns :last_read
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end
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def parent
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Topic.find(parent_id)
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end
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# trivial method for testing Array#to_xml with :methods
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def topic_id
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id
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end
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before_validation :before_validation_for_transaction
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before_save :before_save_for_transaction
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before_destroy :before_destroy_for_transaction
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after_save :after_save_for_transaction
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after_create :after_create_for_transaction
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after_initialize :set_email_address
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class_attribute :after_initialize_called
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after_initialize do
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self.class.after_initialize_called = true
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end
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def approved=(val)
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@custom_approved = val
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write_attribute(:approved, val)
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end
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protected
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def default_written_on
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self.written_on = Time.now unless attribute_present?("written_on")
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end
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def destroy_children
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self.class.delete_all "parent_id = #{id}"
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end
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def set_email_address
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unless self.persisted?
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self.author_email_address = 'test@test.com'
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end
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end
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def before_validation_for_transaction; end
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def before_save_for_transaction; end
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def before_destroy_for_transaction; end
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def after_save_for_transaction; end
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def after_create_for_transaction; end
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end
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class ImportantTopic < Topic
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serialize :important, Hash
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end
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module Web
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class Topic < ActiveRecord::Base
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has_many :replies, :dependent => :destroy, :foreign_key => "parent_id", :class_name => 'Web::Reply'
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end
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end
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