Module: ActiveRecord::Core

Extended by:
ActiveSupport::Concern
Includes:
ActiveModel::Access
Included in:
Base
Defined in:
activerecord/lib/active_record/core.rb

Defined Under Namespace

Modules: ClassMethods

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ActiveSupport::Concern

append_features, class_methods, extended, included, prepend_features, prepended

Methods included from ActiveModel::Access

#slice, #values_at

Instance Attribute Details

#strict_loading_mode ⇒ Object (readonly)

Returns the value of attribute strict_loading_mode.


642
643
644
 
# File 'activerecord/lib/active_record/core.rb', line 642

def strict_loading_mode
  @strict_loading_mode
end

Instance Method Details

#<=>(other_object) ⇒ Object

Allows sort on objects


586
587
588
589
590
591
592
 
# File 'activerecord/lib/active_record/core.rb', line 586

def <=>(other_object)
  if other_object.is_a?(self.class)
    to_key <=> other_object.to_key
  else
    super
  end
end

#==(comparison_object) ⇒ Object Also known as: eql?

Returns true if comparison_object is the same exact object, or comparison_object is of the same type and self has an ID and it is equal to comparison_object.id.

Note that new records are different from any other record by definition, unless the other record is the receiver itself. Besides, if you fetch existing records with select and leave the ID out, you're on your own, this predicate will return false.

Note also that destroying a record preserves its ID in the model instance, so deleted models are still comparable.


552
553
554
555
556
557
 
# File 'activerecord/lib/active_record/core.rb', line 552

def ==(comparison_object)
  super ||
    comparison_object.instance_of?(self.class) &&
    !id.nil? &&
    comparison_object.id == id
end

#blank? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 

598
599
600
 
# File 'activerecord/lib/active_record/core.rb', line 598

def blank? # :nodoc:
  false
end

#connection_handler ⇒ Object 


654
655
656
 
# File 'activerecord/lib/active_record/core.rb', line 654

def connection_handler
  self.class.connection_handler
end

#encode_with(coder) ⇒ Object

Populate coder with attributes about this record that should be serialized. The structure of coder defined in this method is guaranteed to match the structure of coder passed to the #init_with method.

Example:

class Post < ActiveRecord::Base
end
coder = {}
Post.new.encode_with(coder)
coder # => {"attributes" => {"id" => nil, ... }}


537
538
539
540
541
 
# File 'activerecord/lib/active_record/core.rb', line 537

def encode_with(coder)
  self.class.yaml_encoder.encode(@attributes, coder)
  coder["new_record"] = new_record?
  coder["active_record_yaml_version"] = 2
end

#freeze ⇒ Object

Clone and freeze the attributes hash such that associations are still accessible, even on destroyed records, but cloned models will not be frozen.


575
576
577
578
 
# File 'activerecord/lib/active_record/core.rb', line 575

def freeze
  @attributes = @attributes.clone.freeze
  self
end

#frozen? ⇒ Boolean

Returns true if the attributes hash has been frozen.

Returns:

  • (Boolean) 

581
582
583
 
# File 'activerecord/lib/active_record/core.rb', line 581

def frozen?
  @attributes.frozen?
end

#hash ⇒ Object

Delegates to id in order to allow two records of the same type and id to work with something like:

[ Person.find(1), Person.find(2), Person.find(3) ] & [ Person.find(1), Person.find(4) ] # => [ Person.find(1) ]


562
563
564
565
566
567
568
569
570
 
# File 'activerecord/lib/active_record/core.rb', line 562

def hash
  id = self.id

  if id
    self.class.hash ^ id.hash
  else
    super
  end
end

#init_with(coder, &block) ⇒ Object

Initialize an empty model object from coder. coder should be the result of previously encoding an Active Record model, using #encode_with.

class Post < ActiveRecord::Base
end

old_post = Post.new(title: "hello world")
coder = {}
old_post.encode_with(coder)

post = Post.allocate
post.init_with(coder)
post.title # => 'hello world'


460
461
462
463
464
 
# File 'activerecord/lib/active_record/core.rb', line 460

def init_with(coder, &block)
  coder = LegacyYamlAdapter.convert(coder)
  attributes = self.class.yaml_encoder.decode(coder)
  init_with_attributes(attributes, coder["new_record"], &block)
end

#init_with_attributes(attributes, new_record = false) {|_self| ... } ⇒ Object

Initialize an empty model object from attributes. attributes should be an attributes object, and unlike the `initialize` method, no assignment calls are made per attribute.

Yields:

  • (_self)

Yield Parameters:


470
471
472
473
474
475
476
477
478
479
480
481
482
 
# File 'activerecord/lib/active_record/core.rb', line 470

def init_with_attributes(attributes, new_record = false) # :nodoc:
  @new_record = new_record
  @attributes = attributes

  init_internals

  yield self if block_given?

  _run_find_callbacks
  _run_initialize_callbacks

  self
end

#initialize(attributes = nil) {|_self| ... } ⇒ Object

New objects can be instantiated as either empty (pass no construction parameter) or pre-set with attributes but not yet saved (pass a hash with key names matching the associated table column names). In both instances, valid attribute keys are determined by the column names of the associated table – hence you can't have attributes that aren't part of the table columns.

Example:

# Instantiates a single new object
User.new(first_name: 'Jamie')

Yields:

  • (_self)

Yield Parameters:


433
434
435
436
437
438
439
440
441
442
443
444
 
# File 'activerecord/lib/active_record/core.rb', line 433

def initialize(attributes = nil)
  @new_record = true
  @attributes = self.class._default_attributes.deep_dup

  init_internals
  initialize_internals_callback

  assign_attributes(attributes) if attributes

  yield self if block_given?
  _run_initialize_callbacks
end

#initialize_dup(other) ⇒ Object

:nodoc:


511
512
513
514
515
516
517
518
519
520
521
522
523
 
# File 'activerecord/lib/active_record/core.rb', line 511

def initialize_dup(other) # :nodoc:
  @attributes = @attributes.deep_dup
  @attributes.reset(@primary_key)

  _run_initialize_callbacks

  @new_record               = true
  @previously_new_record    = false
  @destroyed                = false
  @_start_transaction_state = nil

  super
end

#inspect ⇒ Object

Returns the contents of the record as a nicely formatted string.


659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
 
# File 'activerecord/lib/active_record/core.rb', line 659

def inspect
  # We check defined?(@attributes) not to issue warnings if the object is
  # allocated but not initialized.
  inspection = if defined?(@attributes) && @attributes
    attribute_names.filter_map do |name|
      if _has_attribute?(name)
        "#{name}: #{attribute_for_inspect(name)}"
      end
    end.join(", ")
  else
    "not initialized"
  end

  "#<#{self.class} #{inspection}>"
end

#present? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 

594
595
596
 
# File 'activerecord/lib/active_record/core.rb', line 594

def present? # :nodoc:
  true
end

#pretty_print(pp) ⇒ Object

Takes a PP and prettily prints this record to it, allowing you to get a nice result from pp record when pp is required.


677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
 
# File 'activerecord/lib/active_record/core.rb', line 677

def pretty_print(pp)
  return super if custom_inspect_method_defined?
  pp.object_address_group(self) do
    if defined?(@attributes) && @attributes
      attr_names = self.class.attribute_names.select { |name| _has_attribute?(name) }
      pp.seplist(attr_names, proc { pp.text "," }) do |attr_name|
        pp.breakable " "
        pp.group(1) do
          pp.text attr_name
          pp.text ":"
          pp.breakable
          value = _read_attribute(attr_name)
          value = inspection_filter.filter_param(attr_name, value) unless value.nil?
          pp.pp value
        end
      end
    else
      pp.breakable " "
      pp.text "not initialized"
    end
  end
end

#readonly! ⇒ Object

Marks this record as read only.


650
651
652
 
# File 'activerecord/lib/active_record/core.rb', line 650

def readonly!
  @readonly = true
end

#readonly? ⇒ Boolean

Returns true if the record is read only.

Returns:

  • (Boolean) 

603
604
605
 
# File 'activerecord/lib/active_record/core.rb', line 603

def readonly?
  @readonly
end

#strict_loading!(value = true, mode: :all) ⇒ Object

Sets the record to strict_loading mode. This will raise an error if the record tries to lazily load an association.

user = User.first
user.strict_loading! # => true
user.comments
=> ActiveRecord::StrictLoadingViolationError

Parameters:

  • value - Boolean specifying whether to enable or disable strict loading.

  • mode - Symbol specifying strict loading mode. Defaults to :all. Using

    :n_plus_one_only mode will only raise an error if an association
that will lead to an n plus one query is lazily loaded.

Example:

user = User.first
user.strict_loading!(false) # => false
user.comments
=> #<ActiveRecord::Associations::CollectionProxy>


633
634
635
636
637
638
639
640
 
# File 'activerecord/lib/active_record/core.rb', line 633

def strict_loading!(value = true, mode: :all)
  unless [:all, :n_plus_one_only].include?(mode)
    raise ArgumentError, "The :mode option must be one of [:all, :n_plus_one_only] but #{mode.inspect} was provided."
  end

  @strict_loading_mode = mode
  @strict_loading = value
end

#strict_loading? ⇒ Boolean

Returns true if the record is in strict_loading mode.

Returns:

  • (Boolean) 

608
609
610
 
# File 'activerecord/lib/active_record/core.rb', line 608

def strict_loading?
  @strict_loading
end

#strict_loading_n_plus_one_only? ⇒ Boolean

Returns true if the record uses strict_loading with :n_plus_one_only mode enabled.

Returns:

  • (Boolean) 

645
646
647
 
# File 'activerecord/lib/active_record/core.rb', line 645

def strict_loading_n_plus_one_only?
  @strict_loading_mode == :n_plus_one_only
end