Module: ActiveRecord::Core

Extended by:
ActiveSupport::Concern
Included in:
Base
Defined in:
lib/active_record/core.rb

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#<=>(other_object) ⇒ Object

Allows sort on objects



479
480
481
482
483
484
485
 
# File 'lib/active_record/core.rb', line 479

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.



446
447
448
449
450
451
 
# File 'lib/active_record/core.rb', line 446

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

#blank? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


491
492
493
 
# File 'lib/active_record/core.rb', line 491

def blank? # :nodoc:
  false
end

#connection_handler ⇒ Object 



506
507
508
 
# File 'lib/active_record/core.rb', line 506

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, ... }}



431
432
433
434
435
 
# File 'lib/active_record/core.rb', line 431

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.



467
468
469
470
 
# File 'lib/active_record/core.rb', line 467

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

#frozen? ⇒ Boolean

Returns true if the attributes hash has been frozen.

Returns:

  • (Boolean) 


473
474
475
476
 
# File 'lib/active_record/core.rb', line 473

def frozen?
  sync_with_transaction_state if @transaction_state&.finalized?
  @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) ]



456
457
458
459
460
461
462
 
# File 'lib/active_record/core.rb', line 456

def hash
  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'



354
355
356
357
358
 
# File 'lib/active_record/core.rb', line 354

def init_with(coder, &block)
  coder = LegacyYamlAdapter.convert(self.class, 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:



364
365
366
367
368
369
370
371
372
373
374
375
376
 
# File 'lib/active_record/core.rb', line 364

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:



327
328
329
330
331
332
333
334
335
336
337
338
 
# File 'lib/active_record/core.rb', line 327

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:



405
406
407
408
409
410
411
412
413
414
415
416
417
 
# File 'lib/active_record/core.rb', line 405

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

  _run_initialize_callbacks

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

  super
end

#inspect ⇒ Object

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



511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
 
# File 'lib/active_record/core.rb', line 511

def inspect
  # We check defined?(@attributes) not to issue warnings if the object is
  # allocated but not initialized.
  inspection = if defined?(@attributes) && @attributes
    self.class.attribute_names.collect do |name|
      if has_attribute?(name)
        attr = _read_attribute(name)
        value = if attr.nil?
          attr.inspect
        else
          attr = format_for_inspect(attr)
          inspection_filter.filter_param(name, attr)
        end
        "#{name}: #{value}"
      end
    end.compact.join(", ")
  else
    "not initialized"
  end

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

#present? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


487
488
489
 
# File 'lib/active_record/core.rb', line 487

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.



536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
 
# File 'lib/active_record/core.rb', line 536

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.



502
503
504
 
# File 'lib/active_record/core.rb', line 502

def readonly!
  @readonly = true
end

#readonly? ⇒ Boolean

Returns true if the record is read only. Records loaded through joins with piggy-back attributes will be marked as read only since they cannot be saved.

Returns:

  • (Boolean) 


497
498
499
 
# File 'lib/active_record/core.rb', line 497

def readonly?
  @readonly
end

#slice(*methods) ⇒ Object

Returns a hash of the given methods with their names as keys and returned values as values.



560
561
562
 
# File 'lib/active_record/core.rb', line 560

def slice(*methods)
  Hash[methods.flatten.map! { |method| [method, public_send(method)] }].with_indifferent_access
end